Linear actuators MKUVE..-KGT and MKUSE..-KGT comprise:

• a carriage unit
• a linear recirculating ball bearing and guideway assembly
• a support rail
• a ball screw drive available with various pitch values
• one locating bearing and non-locating bearing unit
• two sets of bellows.

Actuators MKUVE..-KGT and MKUSE..-KGT are linear units for positioning, handling and machining tasks. They have a guidance system that is wear-resistant and clearance-free. The drive elements are mounted in a self-supporting support rail. The actuators are supplied in a length specific to the application and in a configuration specific to the customer.

The ball screw drive with a driven spindle gives a balanced combination of economical and technical characteristics, even in the design with a single nut.

In the case of series MKUVE..-KGT, the carriage unit is guided by means of two four-row carriages of the linear recirculating ball bearing and guideway assembly KUVE arranged in series.

In the case of series MKUSE..-KGT, the carriage unit is guided by means of two six-row carriages of the linear recirculating ball bearing and guideway assembly KUSE arranged in series.

Accessories available for the actuators include fasteners and connectors, couplings and coupling housings and electric drive components such as motors, motor/gearbox units and controllers.

The advantage of the actuator MKUSE..-KGT is a significantly longer operating life under the same load compared with the actuator MKUVE..-KGT.

Designs

These linear actuators with a four-row linear recirculating ball bearing and guideway assembly (MKUVE) or six-row linear recirculating ball bearing and guideway assembly (MKUSE) are available in various designs, see table.

Available designs

Suffix	Description	Design
‒	One driven carriage unit	Basic design
SPU	One spindle support	Standard
2SPU	Two spindle supports	Standard
WN2	Second, non-driven carriage unit	Standard
N	Fixing slots in carriage unit	Standard
OA	Without ball screw drive	Standard

Special designs are available by agreement. Examples of these are linear actuators:

• with several, non-driven carriage units
• with a linear recirculating ball bearing and guideway assembly and ball screw drive with anti-corrosion protection
• with bellows resistant to welding beads
• with a rolled ball screw spindle to accuracy class 25 μm/300 mm
• with a trapezoidal screw drive
• without bellows
• with an extended carriage unit
• with compressed air connections in the support rail
• with a locating bearing arrangement having increased load capacity
• with special machining.

Carriage unit

The carriage unit in series MKUVE..-KGT comprises a carriage housing made from anodised profiled aluminium, a lubrication distributor and the two KWVE carriages  of the linear recirculating ball bearing and guideway assembly, ➤ Figure and table.

The carriage unit in series MKUSE25..-KGT comprises an anodised aluminium plate, two end plates and two KWSE carriages  of the linear recirculating ball bearing and guideway assembly, see table.

If higher moment loads must be supported, the actuator is available with a second, non-driven carriage unit. It is connected to the driven carriage unit by means of the adjacent construction.

Lengths of carriage units

Series	Carriage unit length	Suffix
	mm
MKUVE15..-KGT	160	160
MKUVE20..-KGT	200	200
MKUSE25..-KGT	200	200

Carriage unit



Bellows

The bellows fitted as standard protect the screw drive and guidance system against contamination. They are guided in the support rail and, as a result, the actuator is also suitable for applications involving an overhead arrangement.

Lubrication

In the case of linear actuators of series MKUVE..-KGT, the carriage unit is equipped with a lubricant distributor. This allows relubrication of the carriages and spindle nut.

In the case of the linear actuator of series MKUSE25..-KGT, the carriages and spindle nut are relubricated via the end plate on the locating bearing side of the carriage unit.

Sealing

The carriages are sealed.

Location

For location on the adjacent construction, the carriage unit in series MKUVE..-KGT has two T-slots, with centrally positioned filling slots.

For location on the adjacent construction, the carriage unit in series MKUSE25..-KGT has threaded holes.

Support rail unit

The support rail unit is a composite unit comprising a carrier profile made from anodised aluminium and the guideway of a four-row linear recirculating ball bearing and guideway assembly KUVE (actuator series MKUVE..-KGT) or of a six-row linear recirculating ball bearing and guideway assembly KUSE (actuator series MKUSE..-KGT). The linear recirculating ball bearing and guideway assemblies are preloaded clearance-free and run without stick-slip.

Since the support rail has very high bending rigidity, it can be used to span large gaps.

Support rail length

The maximum length of the support rails in the case of MKUVE..-KGT is 5 850 mm. In the case of MKUVE..-KGT/50..-N, the maximum length of the support rail is 2 900 mm.

T-slots

Support rails and carriage units have T-slots for standardised T‑nuts. These are used in order to fix the actuators to the adjacent construction.

Ball screw drive

The spindle has a rolled thread and, depending on the diameter, up to four pitch values per spindle size are available, see table.

As standard, single nuts with an axial clearance dependent on the pitch are used, see table. Preloaded double nuts are available for the pitch values 5 mm, 10 mm and 20 mm.

The spindle is supported on the locating bearing side by an axial angular contact ball bearing ZKLN or ZKLF. The bearings are greased for life.

The screw drive and guidance system are protected against contamination by bellows.

One or two spindle supports can be fitted.

Ball screw drive variants

Screw drive variants			Suffix
Pitch	5	mm	5
	10	mm	10
	20	mm	20
	40	mm	40
	50	mm	50
Single flanged nut			F
Double nut			FM
Single nut (cylindrical)			M
Double nut (cylindrical)			MM
Without drive (no spindle), with bellows			OA

Permissible spindle speed

For data on the maximum spindle speed, see pages starting link.

For longer actuators, the permissible spindle speed can be increased by the use of one or two spindle supports (suffix SPU or 2SPU). These supports, arranged in pairs, can be moved as required. They are moved by the driven carriage unit.

Locating and non-locating bearing unit

The locating bearing unit supports the axial forces acting on the ball screw drive. It comprises an end plate made from anodised aluminium and an axial angular contact ball bearing ZKLN or ZKLF.

The non-locating bearing unit comprises an anodised aluminium end plate. This contains a needle roller bearing with an extended inner ring for compensation of possible length increases between the support rail and the ball screw drive.

Spindle support

Actuators MKUVE15..-KGT with a total length of more than 800 mm, MKUVE20..-KGT with a total length of more than 1 000 mm and MKUSE25..-KGT with a total length of more than 1 200 mm can be fitted with movable spindle supports (suffix SPU or 2SPU).

Drive elements

For the actuators, Schaeffler also offers components such as coup­lings, coupling housings and planetary gearboxes as well as servo motors and servo controllers, ➤ Figure.

Linear actuator with drive elements



Example: · MKUSE25..-KGT ·



 Actuator with monorail guidance system and ball screw drive ·



 Coupling KUP ·



 Coupling housing KGEH ·



 Servo motor MOT

Proven drive combinations

ATTENTION

The bearing load in the actuators must be checked; it is not taken into consideration in dimensioning of the motor. For vertical mounting, motors with a holding brake must be used.

If different loading and kinematic criteria apply, the least favourable operating conditions should be used for calculation of the drive motor and design of the gearbox, coupling and servo controller.

Mechanical accessories

A large number of accessories are available for linear actuators with monorail guidance system and ball screw drive. The allocation of accessories is valid if the data match the Technical prin­ciples and the Design and safety guidelines, link.

Allocation

Linear actuator / size		MKUVE..-KGT-N	15	20
		MKUSE..-KGT	25
Fixing brackets
	WKL-48×48×35		‒	‒
	WKL-65×65×30-N
	WKL-65×65×35		‒	‒
	WKL-65×65×35-N		‒
	WKL-90×90×35-N		‒
	WKL-98×98×35		‒	‒
Clamping lugs
	SPPR-10,5×20			‒	‒
	SPPR-13,5×20				‒
	SPPR-24×20			‒	‒
	SPPR-23×30		‒		‒
	SPPR-28×30		‒	‒
T-nuts
	MU-DIN 508 M4×5			‒	‒
	MU-M3×5 (similar to DIN 508)			‒	‒
	MU-DIN 508 M6×8		‒
	MU-M4×8 (similar to DIN 508)		‒
T-nuts made from corrosion-resistant steel
	MU-DIN 508 M4×5-RB			‒	‒
	MU-DIN 508 M6×8-RB		‒
T-bolts
	SHR DIN 787-M5×5×25			‒	‒
	SHR DIN 787-M8×8×32		‒
Rotatable T-nuts
	MU-M3×5-RHOMBUS			‒	‒
	MU-M4×8-RHOMBUS		‒
	MU-M6×8-RHOMBUS		‒
Positionable T-nuts
	MU-M4×5-POS			‒	‒
	MU-M5×5-POS			‒	‒
	MU-M4×8-POS		‒
	MU-M5×8-POS		‒
	MU-M6×8-POS		‒
	MU-M8×8-POS		‒

Suitable.

Allocation

Linear actuator / size		MKUVE..-KGT-N	15	20
		MKUSE..-KGT	25
Hexagon nuts
	MU-ISO 4032 M4				‒
	MU-ISO 4032 M5			‒	‒
	MU-ISO 4032 M8		‒
T-strips
	LEIS-M4/5-T-NUT-SB-ST			‒	‒
	LEIS-M4/5-T-NUT-HR-ALU			‒	‒
	LEIS-M6/8-T-NUT-SB-ST		‒
	LEIS-M8/8-T-NUT-SB-ST		‒
	LEIS-M6/8-T-NUT-HR-ST		‒
	LEIS-M6/8-T-NUT-HR-ALU		‒
	LEIS-M4/5-T-NUT-ST			‒	‒
	LEIS-M6/8-T-NUT-ST		‒
Connector sets (parallel connectors)
	VBS-PVB8		‒
	VBS-PVB8/10		‒
Slot closing strips
	NAD-5×5,7			‒	‒
	NAD-8×4,5		‒
	NAD-8×11,5		‒

	Suitable.
	Suitable and T-strips must already have been inserted at the time of despatch.

Design and safety guidelines

Load carrying capacity and load safety factor

The load carrying capacities and load safety factors to be observed differ as a function of the mounting position.

Deflection

The deflection of linear actuators is essentially dependent on the support spacing, the rigidity of the support rail, the adjacent construction and the bearing arrangement. As the rigidity of these components increases, the deflection of the actuators is reduced.

Diagrams

The diagram values are determined for a bearing arrangement or clamping which is in theory infinitely rigid and are subdivided into locating/non-locating and locating/locating bearing arrangements, starting ➤ Figure.

The deflection of the support rail is valid under the following conditions:

• support rail unit comprising carrier profile and guideway
• support spacings up to 5 850 mm
• introduction of the load at the centre of the carriage unit if this is at the centre point between the bearing points.

ATTENTION

The diagrams represent guide values only for the deflection of the support rail, starting ➤ Figure. The effect of deflection on the rating life of the guidance system is not taken into consideration.

It is not possible to provide deflection diagrams for actuators with a second, non-driven carriage unit since there will be different spacings between the carriage units. In such cases, please consult the Schaeffler engineering service.

Deflection about the z axis





 Locating bearing arrangement ·



 Non-locating bearing arrangement

Deflection about the z axis





 Locating bearing arrangement ·



 Locating bearing arrangement

Deflection about the y axis





 Locating bearing arrangement ·



 Non-locating bearing arrangement

Deflection about the y axis





 Locating bearing arrangement ·



 Locating bearing arrangement

Deflection about the z axis



MKUVE15..-KGT

Locating/non-locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the z axis



MKUVE15..-KGT

Locating/locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the y axis



MKUVE15..-KGT

Locating/non-locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the y axis



MKUVE15..-KGT

Locating/locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the z axis



MKUVE20..-KGT

Locating/non-locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the z axis



MKUVE20..-KGT

Locating/locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the y axis



MKUVE20..-KGT

Locating/non-locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the y axis



MKUVE20..-KGT

Locating/locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the z axis



MKUSE25..-KGT

Locating/non-locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the z axis



MKUSE25..-KGT

Locating/locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the y axis



MKUSE25..-KGT

Locating/non-locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the y axis



MKUSE25..-KGT

Locating/locating bearing arrangement · Δ_vz = deflection · l = support spacing

Idling drive torque

The idling drive torque M₀ of linear actuators with screw drive is calculated as a function of the spindle speed and the horizontal (M_0h) or vertical (M_0v) mounting position. The idling drive torque increases with increasing travel velocity.

Idling drive torque
Horizontal mounting position



MKUVE15..-KGT/..-F · MKUVE15..-KGT/..-FM

n = spindle speed · M_0h = idling drive torque

Idling drive torque
Vertical mounting position



MKUVE15..-KGT/..-F · MKUVE15..-KGT/..-FM

n = spindle speed · M_0v = idling drive torque

Idling drive torque
Horizontal mounting position



MKUVE15..-KGT/..-F-WN2 · MKUVE15..-KGT/..-FM-WN2

n = spindle speed · M_0h = idling drive torque

Idling drive torque
Vertical mounting position



MKUVE15..-KGT/..-F-WN2 · MKUVE15..-KGT/..-FM-WN2

n = spindle speed · M_0v = idling drive torque

Idling drive torque
Horizontal mounting position



MKUVE20..-KGT/..-F · MKUVE20..-KGT/..-FM

n = spindle speed · M_0h = idling drive torque

Idling drive torque
Vertical mounting position



MKUVE20..-KGT/..-F · MKUVE20..-KGT/..-FM

n = spindle speed · M_0v = idling drive torque

Idling drive torque
Horizontal mounting position



MKUVE20..-KGT/..-F..-WN2 · MKUVE20..-KGT/..-FM..-WN2

n = spindle speed · M_0h = idling drive torque

Idling drive torque
Vertical mounting position



MKUVE20..-KGT/..-F..-WN2 · MKUVE20..-KGT/..-FM..-WN2

n = spindle speed · M_0v = idling drive torque

Idling drive torque Horizontal mounting position



MKUSE25..-KGT/..-M · MKUSE25..-KGT/..-MM

n = spindle speed · M_0h = idling drive torque

Idling drive torque
Vertical mounting position



MKUSE25..-KGT/..-M · MKUSE25..-KGT/..-MM

n = spindle speed · M_0v = idling drive torque

Idling drive torque Horizontal mounting position



MKUSE25..-KGT/..-M..-WN2 · MKUSE25..-KGT/..-MM..-WN2

n = spindle speed · M_0h = idling drive torque

Length calculation of actuators

The length calculation of actuators is based on the required effective stroke length N_H . The effective stroke length N_H must be increased by the addition of safety spacing values on both sides of the travel distance.

The total length L_tot of the actuator is determined from the support rail length L₂ and the lengths of the end plates L₄ and L₅. If two carriage units are present, both carriage unit lengths L and the spacing L_x1 must be taken into consideration.

If spindle supports are used, size 25 must be calculated using a larger effective length factor, see table.

Parameters for length calculation

GH	mm	Total stroke length
NH	mm	Effective stroke length
S	mm	Safety spacing, for minimum values see table
L	mm	Length of carriage plate
L2	mm	Length of support rail
L4	mm	Length of end plate
L5	mm	Length of end plate
Ltot	mm	Total length of actuator
Lx1	mm	Spacing between two carriage units
FBL		Effective length factor according to actuator type
FBL SPU		Effective length factor for spindle support according to actuator type.

Total stroke length

The total stroke length G_H is determined from the required effective stroke length and the safety spacings, which must correspond to at least the spindle pitch P.



Support rails

Actuators with monorail guidance system and ball screw drive are only available with a single-piece support rail. The maximum length of a support rail is 5 850 mm. In the case of actuators MKUVE15..-KGT/50, the maximum length of the support rail is 2 900 mm.

Spacing L_x1 between carriage units

The minimum spacing L_x1 min between two carriage units is 20 mm.

Total length L_tot and support rail length L₂

The following ➤ equtions are designed for one and two carriage units. The parameters and their position can be found in ➤ Figure, ➤ Figure and the table. If more than two carriage units are present, please contact us.

Length parameters for one carriage unit



One carriage unit with bellows



Total length with drive



Total length without drive



Length parameters for two carriage units



Two carriage units with bellows



Total length with drive



Total length without drive



Length parameters

Designation	L	L4	L5	S	FBL	FBL SPU
	mm	mm	mm	mm
MKUVE15-160-KGT/5-N	160	25	25	5	1,2	1,2
MKUVE15-160-KGT/10-N				10	1,2	1,2
MKUVE15-160-KGT/50-N				50	1,2	1,2
MKUVE15-160-KGT-OA-N	160	‒	25	10	1,2	‒
MKUVE20-200-KGT/5-N	200	28	28	5	1,17	1,17
MKUVE20-200-KGT/10-N				10	1,17	1,17
MKUVE20-200-KGT/20-N				20	1,17	1,17
MKUVE20-200-KGT/50-N				50	1,17	1,17
MKUVE20-200-KGT-OA-N	200	‒	28	10	1,17	‒
MKUSE25-200-KGT/5	200	32	32	5	1,2	1,23
MKUSE25-200-KGT/10				10	1,2	1,23
MKUSE25-200-KGT/20				20	1,2	1,23
MKUSE25-200-KGT/40				40	1,2	1,23
MKUSE25-200-KGT-OA	200	‒	32	10	1,2	‒

Effective length of bellows

The effective length of bellows is the length occupied by the bellows in the fully compressed state, ➤ Figure, ➤ equtions and table.

Effective length calculation





 Carriage unit against the right end stop ·



 Carriage unit against the left end stop

Effective length calculation without spindle support



Effective length calculation with spindle support



BL	mm	Effective length of bellows
FBL	–	Effective length factor according to actuator type, see table
FBL SPU	mm	Effective length factor for spindle support according to actuator type.

Mass calculation

The total mass of an actuator is calculated from the mass of the actuator without a carriage unit, the carriage unit and the special design: second carriage unit (WN2), ➤ Figure. Insert the values from the table in the following ➤ equation. The values m_LAW and m_BOL are mandatory.



Basic and additional designs





 Basic design ·



 Second carriage unit (WN2)

Values for mass calculation

Designation	Mass
	Carriage unit	Design	Actuator without carriage unit
		m3
	mLAW	WN2	mBOL
	≈kg	≈kg	≈kg
MKUVE15-160-KGT..-N	1,16	0,87	(Ltot – 50)  ·  0,0073 + 0,87
MKUVE15-160-KGT-OA..-N	0,87	0,87	(Ltot – 50)  ·  0,0073 + 0,59
MKUVE20-200-KGT..-N	2,10	1,69	(Ltot – 56)  ·  0,0119 + 2,18
MKUVE20-200-KGT-OA..-N	1,69	1,69	(Ltot – 56)  ·  0,0119 + 1,27
MKUSE25-200-KGT	4,65	3,37	(Ltot – 64)  ·  0,0191 + 4,3
MKUSE25-200-KGT-OA	3,37	3,37	(Ltot – 64)  ·  0,0191 + 1,93

Lubrication

The guidance systems and ball screw drive in linear actuators are initially greased with a high quality lithium complex soap grease KP2P-30 according to DIN 51825 and must be relubricated during operation.

The carriages in the actuators are sealed, have an initial greasing and can be relubricated. The bearings fitted, the double row axial angular contact ball bearing (locating bearing) and the integrated needle roller bearing are sealed and lubricated for life.

Structure of suitable greases

Greases suitable for the linear recirculating ball bearing and guideway assemblies have the following composition:

• lithium soap or lithium complex soap grease with base oil having a mineral oil base
• special anti-wear additives for loads C/P ＜ 8, indicated by “P” in the DIN designation
• base oil viscosity ISO VG 68 to ISO VG 100
• consistency in accordance with NLGI grade 2.

If different greases are used, their miscibility and compatibility must be checked first.

Relubrication intervals

The relubrication intervals are essentially dependent on the following factors:

• the travel velocity of the actuator carriage unit
• the load
• the operating temperature
• the stroke length
• the environmental conditions and environmental influences
• the mounting position.

The cleaner the environment, the lower the lubricant consumption.

Calculation of the relubrication interval

Since it is not possible to calculate all the influencing factors, the time at which relubrication must be carried out and the quantity of lubricant which must be used can only be precisely determined under actual operating conditions. If no precise data are available, the value for the relubrication quantity for many applications can be taken from table.

An approximation equation can be used, however, to determine a guide value for the relubrication interval for many applications.

For the ball screw drive, a relubrication interval of 200 h to 300 h is sufficient under normal operating conditions.

Relubrication must be carried out, irrespective of the result of this calculation, no more than 1 year after the last lubrication.

ATTENTION

Fretting corrosion is a consequence of lubricant starvation and is visible as a reddish discolouration of the rolling element raceways. Lubricant starvation can lead to permanent damage to the system and therefore to its failure. It must be ensured that the lubrication intervals are reduced accordingly in order to prevent fretting corrosion.

When calculating the relubrication interval, the grease operating life must also be checked. This is restricted to a maximum of 3 Cages due to the ageing resistance of the grease. It is the user’s responsibility to consult the lubricant manufacturer.

Relubrication quantities

Relubrication should be carried out wherever possible with several partial quantities at various times instead of the complete quantity at the time of the relubrication interval. Relubrication quantities, see table.

Grease quantities

Linear actuator	Relubrication quantity per driven carriage unit, lubrication nipple and longitudinal side	Relubrication quantity per non-driven carriage unit, lubrication nipple and longitudinal side
	≈g	≈g
MKUVE15-160-KGT/5-F MKUVE15-160-KGT/5-FM MKUVE15-160-KGT/10-F MKUVE15-160-KGT/10-FM MKUVE15-160-KGT/50-F	2 to  3	1 to 2
MKUVE20-200-KGT/5-F MKUVE20-200-KGT/5-FM MKUVE20-200-KGT/10-F MKUVE20-200-KGT/10-FM MKUVE20-200-KGT/20-F MKUVE20-200-KGT/20-FM MKUVE20-200-KGT/50-F	3 to  4	2 to 3
MKUSE25-200-KGT/5-M MKUSE25-200-KGT/5-MM MKUSE25-200-KGT/10-M MKUSE25-200-KGT/10-MM MKUSE25-200-KGT/20-M MKUSE25-200-KGT/20-MM MKUSE25-200-KGT/40-M	8 to 10	6 to 7

Relubrication procedure

Relubrication should be carried out whilst the carriage unit is moving and warm from operation over a minimum stroke length corresponding to one carriage unit length.

During lubrication, it must be ensured that the grease gun, grease, lubrication nipple and the environment of the lubrication nipple are clean.

ATTENTION

The lubrication method involves loss of lubricant. The used lubricant must be collected and disposed of by methods that help to protect the environment.

The use of lubricants is governed by national regulations for environmental protection and occupational safety as well as information from the lubricant manufacturers. These regulations must be observed in all cases.

Lubrication nipples

In the case of actuators MKUVE..-KGT and MKUSE..-KGT, relubrication of the integrated guidance system and the ball screw drive is carried out exclusively via countersunk funnel type lubrication nipples NIP DIN 3405-A M6, ➤ Figure and ➤ Figure in the longitudinal sides of the carriage unit.

Mounting situation



MKUVE..-KGT

Valid with the exception of MKUSE25..-KGT ·



 NIP DIN 3405-A M6

Mounting situation



MKUSE25..-KGT



 NIP DIN 3405-A M6

The carriage unit can be connected to a semi-automatic or fully automatic central lubrication system. In this case, the funnel type lubrication nipple must be replaced by a straight or angled screw-in connector with a M6×1 thread. The central lubrication system is connected by means of pipes or hoses.

Relubrication points

The carriage and ball screw nut have funnel type lubrication nipples NIP DIN 3405-A M6 on the right or left longitudinal side of each carriage unit. These can be used for relubrication, ➤ Figure, ➤ Figure, ➤ Figure, ➤ Figure and table.

Lubrication points



MKUVE15..-KGT · MKUVE20..-KGT



 NIP DIN 3405-A M6

Lubrication ducts in the carriage unit



MKUVE15..-KGT · MKUVE20..-KGT



 NIP DIN 3405-A M6 ·



 Lubrication duct

ATTENTION

During lubrication of actuators, all lubrication points on one longitudinal side of a carriage unit must always be provided with lubricant.

Position of relubrication points

Designation	Mounting dimensions
	S56	h56	l56
	mm	mm	mm
MKUVE15-160..-KGT	26	10,8	71
MKUVE20-200..-KGT	26	13,5	100
MKUSE25-200..-KGT	15	15,5	9

Lubrication points



MKUVE15..-KGT · MKUVE20..-KGT

Lubrication points



MKUSE25..-KGT

T-slots

The T-slots in the support rail and the carriage unit are designed for T-bolts according to DIN 787 and T-nuts according to DIN 508 (with the exception of T-slot size 4,5), ➤ Figure.

Sizes of T-slots in support rail and carriage unit





 T-slot size 8, type A ·



 T-slot size 8, type B ·



 T-slot size 5 ·



 T-slot size 4,5 for hexagon nuts M4, ISO 4032

Dimensions of T-slots

Designation	Support rail		Carriage unit
	Lateral	Bottom	Top	Lateral	h58
					mm
MKUVE15..-KGT					9
MKUVE20..-KGT					12
MKUSE25..-KGT			‒	‒	‒

Filling openings

The filling openings in the non-locating bearing units of MKUVE15..‑KGT and MKUVE20..-KGT are used for the insertion of T‑nuts and T‑bolts in the T-slots of the support rail, ➤ Figure. In the case of MKUSE25..-KGT, filling openings are located in the locating and non-locating bearing unit.

The filling openings in the carriage unit of MKUVE..-KGT for the T‑nuts (top) are located at the height of the lubrication nipple, ➤ Figure. The hexagon nuts M4 (lateral) are introduced into the lateral T-slots via the recess for the lubrication nipple.

Filling opening in the support rail





 Filling opening

Connectors for switching tags

Switching tags can be screw mounted to the carriage unit in order to activate switches in the adjacent construction. The position and size are dependent on the size, ➤ Figure and ➤ Figure.

T-slots for switching tags on the carriage unit (sizes 15 and 20)



MKUVE15..-KGT · MKUVE20..-KGT

Connectors for switching tags on the carriage unit (size 25 )



MKUSE25..-KGT



 Hole in carriage unit

Maximum permissible spindle speed

Screw drives must not be allowed to run in the critical speed range.

The critical speed is essentially dependent on the following factors:

• spindle length
• spindle diameter
• spindle bearing arrangement
• mounting method.

The carriage unit velocity v is determined from the spindle speed n and the spindle pitch P. The limit values for velocities must be observed.

For calculation of the carriage unit velocity, the following applies:

v	m/s	Carriage unit velocity
n	min–1	Spindle speed
P	mm	Spindle pitch.

Diagrams

The diagram show the relationship for individual series and sizes between the critical speed and the spindle length, ➤ Figure. The diagram takes account of the effective length (B_L) of the bellows cover. Definition of the effective length, see link.

The diagram is valid for linear actuators with and without spindle supports, ➤ Figure.

ATTENTION

The values apply to a ball screw drive operating in a tensile direction.

Maximum permissible spindle speed



MKUVE..-KGT · MKUSE..-KGT

n = maximum permissible spindle speed · L₂ = support rail length ·



 Without spindle support ·



 One spindle support ·



 Two spindle supports

Kinematic operating limits

Maximum velocities are determined as a function of the critical spindle speed, see table. The limiting speed of the bearings can also restrict the spindle speed and thus the velocity.

Kinematic operating limits

Actuator	Acceleration a	Maximum velocity v	Maximum spindle speed n
	m/s2	m/s	min–1
MKUVE15-160-KGT/5-F	20	0,25	3 000
MKUVE15-160-KGT/5-FM	10
MKUVE15-160-KGT/10-F	20	0,63	3 800 **
MKUVE15-160-KGT/10-FM	10
MKUVE15-160-KGT/50-F	20	2,5	3 000
MKUVE20-200-KGT/5-F	20	0,29	3 500 **
MKUVE20-200-KGT/5-FM	10
MKUVE20-200-KGT/10-F	20	0,5	3 000
MKUVE20-200-KGT/10-FM	10
MKUVE20-200-KGT/20-F	20	1,16	3 500 **
MKUVE20-200-KGT/50-F	20	2,9	3 500 **
MKUSE25-200-KGT/5-M	20	0,215	2 600 **
MKUSE25-200-KGT/5-MM	10
MKUSE25-200-KGT/10-M	20	0,43
MKUSE25-200-KGT/10-MM	10
MKUSE25-200-KGT/20-M	20	0,86
MKUSE25-200-KGT/20-MM	10
MKUSE25-200-KGT/40-M	20	1,73

^** Restricted by the limiting speed of the locating bearing with grease lubrication.

Mounting position and mounting arrangement

Due to their construction and the linear guidance system fitted, actuators are suitable for all mounting positions and mounting arrangements. Possible mounting positions are shown in ➤ Figure, ➤ Figure and ➤ Figure.

The actuators can be used in the “common” horizontal mounting position and also in a vertical mounting position.

Mounting of actuators with a carriage unit to one side or suspended overhead is possible. In such cases, please consult the Schaeffler engineering service.

ATTENTION

The ball screw drives fitted in these actuators are not self-locking. The carriage unit and load must be secured against autonomous travel or dropping if the actuators are used in a vertical or tilted mounting position. This can be achieved, for example, by means of a brake or counterweight. The drop guard must function in manual operation as well as in motor operation, especially if the motor has no current.

Safety guidelines, especially in relation to personal protection, must be observed.

Movable or stationary carriage unit





 Movable carriage unit ·



 Stationary carriage unit

Mounting positions





 Horizontal ·



 Tilted ·



 Vertical

Mounting positions





 Mounting position 0° ·



 Mounting position 180° ·



 Mounting position 90°

Mounting

In most applications, an actuator is mounted in two steps:

• location of the support rail on the adjacent construction
• mounting of the components to be moved on the carriage unit or carriage units.

Interchange of actuator components

For the fitting and assembly of actuator components, a fitting and maintenance manual is available for each series of actuator. Please consult the Schaeffler engineering service.

Maintenance

Failure to carry out maintenance, incorrect maintenance, assembly errors and lubrication errors as well as inadequate protection against contamination can lead to premature failure of actuators.

Maintenance work is restricted in general to relubrication, cleaning and regular visual inspection for damage.

Maintenance intervals, especially the intervals between relubrication, are influenced by the following factors:

• the travel velocity of the carriage unit
• the load
• the temperature
• the stroke length
• the environmental conditions and influences.

ATTENTION

Guidance parts relevant to function must be greased and supplied with lubricant via appropriate lubrication points.

Cleaning

If heavy contamination is present, actuators must be cleaned in order to ensure reliable function. Suitable cleaning tools include paintbrushes, soft brushes and soft cloths.

ATTENTION

Abrasives, petroleum ether and oils must not be used.

Accuracy

Length tolerances

The length tolerances of actuators are shown in ➤ Figure and the table. The data are valid for all actuators described in this chapter.

Length tolerances



L_tot = total length · L₂ = length of support rail

Tolerances

Total length of actuator Ltot				Tolerance
mm				mm
		Ltot ＜	1 000	±2
1 000	≦	Ltot ＜	2 000	±3
2 000	≦	Ltot ＜	4 000	±4
4 000	≦	Ltot		±5

Straightness of support rails

The support rails of the actuators are precision straightened and the tolerances are better than DIN 17615.

The tolerances are arithmetic mean values and are stated for individual series and sizes, see table.

Tolerances

Length L2 of support rail				MKUVE15..-KGT MKUVE20..-KGT			MKUSE25..-KGT
				t2	t3	Torsion	t2	t3	Torsion
mm				mm	mm	mm	mm	mm	mm
		L2 ≦	1 000	0,4	0,3	0,8	0,4	0,3	0,5
1 000	＜	L2 ≦	2 000	0,8	0,5	1	0,8	0,5	1
2 000	＜	L2 ≦	3 000	1,2	0,7	1,2	1,2	0,7	1,5
3 000	＜	L2 ≦	4 000	1,5	1	1,6	1,5	1	2
4 000	＜	L2 ≦	5 000	1,9	1,2	1,8	1,9	1,2	2,5
5 000	＜	L2 ≦	5 850	2,5	1,5	2	2,5	1,5	3

➤ Figure shows the method for determining the straightness of the support rail.

Measurement method for straightness tolerances



t₂, t₃ = straightness tolerance

Pitch accuracy of spindle

The pitch accuracies of rolled ball screw spindles for the individual series and sizes are given in the table.

Standard actuators are fitted single nuts with clearance where the axial clearance is dependent on the pitch. Where higher accuracy requirements are present, it is possible in the case of many spindle pitch to obtain actuators with a preloaded (clearance-free) double nut.

ATTENTION

In the case of standard actuators, the nut unit (double nut) can only be preloaded clearance-free if the spindle pitch P is less than the nominal diameter d₀ of the spindle.

Designs of spindle and spindle nut

Designation	Spindle			Spindle nut (F, M = single nut, FM, MM = double nut)
	⌀ d0	P	Pitch accuracy	Suffix	Axial clearance
					max.
	mm	mm	μm/300 mm		mm
MKUVE15-160-KGT	16	5	50	F	0,05
				FM	Preloaded
		10		F	0,05
				FM	Preloaded
		50	100	F	0,05
MKUVE20-200-KGT	20	5	50	F	0,05
				FM	Preloaded
		10		F	0,05
				FM	Preloaded
		20		F	0,05
		50
MKUSE25-200-KGT	32	5	50	M	0,05
				MM	Preloaded
		10		M	0,05
				MM	Preloaded
		20		M	0,05
				MM	Preloaded
		40		M	0,05

Tandem actuators MDKUVE..-KGT and MDKUSE..-KGT comprise:

• a carriage unit
• two linear recirculating ball bearing and guideway assemblies
• a support rail
• a ball screw drive available with various pitch values
• one locating bearing and non-locating bearing unit
• two sets of bellows.

Actuators MDKUVE..-KGT and MDKUSE..-KGT correspond substantially in their basic design and technical characteristics to the actuators MKUVE..-KGT and MKUSE..-KGT. The features of tandem actuators substantially match the features of linear actuators.

Tandem actuators are suitable for high loads and high moments about all three axes.

The carriage unit of the tandem actuator is guided on two parallel guideways each with two carriages arranged in series.

Designs

Tandem actuators MDKUVE..-KGT and MDKUSE..-KGT are available in various designs, see table.

Available designs

Suffix	Description	Design
‒	One driven carriage unit	Basic design
SPU	One spindle support	Standard
2SPU	Two spindle supports	Standard
WN2	Second, non-driven carriage unit	Standard
N	Fixing slots in carriage unit	Standard
OA	Without ball screw drive	Standard

Carriage unit

The carriage unit in series MDKUVE..-KGT and MDKUSE..-KGT comprises a carriage housing made from anodised profiled aluminium, a lubrication distributor and the two KWVE or KWSE carriages  of the linear recirculating ball bearing and guideway assembly, ➤ Figure and table.

If higher moment loads must be supported, the actuator is available with a second, non-driven carriage unit. It is connected to the driven carriage unit by means of the adjacent construction.

Lengths of carriage units

Series	Carriage unit length	Suffix
	mm
MDKUVE15..-KGT	240	240
MDKUVE25..-KGT	365	365
MDKUSE25..-KGT	365	365
MDKUVE35..-KGT	500	500
MKKUVE20..-KGT	200	200

Carriage unit



Spindle support

Actuators MDKUVE15..-KGT with a total length of more than 1 000 mm, MDKUVE25..-KGT and MDKUSE25..-KGT with a total length of more than 1 400 mm and MDKUVE35..-KGT with a total length of more than 1 750 mm can be fitted with movable spindle supports (suffix SPU or 2SPU).

Mechanical accessories

A large number of accessories are available for tandem actuators with monorail guidance system and ball screw drive. The allocation of accessories is valid if the data match the Technical principles and the Design and safety guidelines, link.

Allocation

Linear actuator / size		MDKUVE..-KGT-N	15	25	35
		MDKUSE..-KGT-N	25
Fixing brackets
	WKL-48×48×35				‒
	WKL-65×65×30-N				‒
	WKL-65×65×35				‒
	WKL-65×65×35-N				‒
	WKL-90×90×35-N
	WKL-98×98×35		‒		‒
Clamping lugs
	SPPR-22×20			‒	‒
	SPPR-26×30		‒		‒
	SPPR-28×30				‒
	SPPR-31×30		‒	‒
	SPPR-34×36		‒	‒
T-nuts
	MU-DIN 508 M4×5			‒	‒
	MU-M3×5 (similar to DIN 508)			‒	‒
	MU-DIN 508 M6×8				‒
	MU-M4×8 (similar to DIN 508)				‒
	MU-DIN 508 M8×10		‒
	MU-M6×10 (similar to DIN 508)		‒
T-nuts made from corrosion-resistant steel
	MU-DIN 508 M4×5-RB			‒	‒
	MU-DIN 508 M6×8-RB				‒
	MU-DIN 508 M8×10-RB		‒
T-bolts
	SHR-DIN 787 M4×5×25			‒	‒
	SHR DIN 787-M8×8×32				‒
	SHR DIN 787-M10×10×40		‒
Rotatable T-nuts
	MU-M3×5-RHOMBUS			‒	‒
	MU-M4×8-RHOMBUS				‒
	MU-M6×8-RHOMBUS				‒
	MU-M8×10-RHOMBUS		‒

Suitable.

Allocation

Linear actuator / size		MKUVE..-KGT-N	15	25	35
		MKUSE..-KGT-N	25
Positionable T-nuts
	MU-M4×5-POS			‒	‒
	MU-M5×5-POS			‒	‒
	MU-M4×8-POS				‒
	MU-M5×8-POS				‒
	MU-M6×8-POS				‒
	MU-M8×8-POS				‒
Hexagon nuts
	MU-ISO 4032 M5			‒	‒
	MU-ISO 4032 M8
	MU-ISO 4032 M10		‒
T-strips
	LEIS-M4/5-T-NUT-SB-ST			‒	‒
	LEIS-M4/5-T-NUT-HR-ALU			‒	‒
	LEIS-M6/8-T-NUT-SB-ST				‒
	LEIS-M8/8-T-NUT-SB-ST				‒
	LEIS-M6/8-T-NUT-HR-ST				‒
	LEIS-M6/8-T-NUT-HR-ALU				‒
	LEIS-M4/5-T-NUT-ST				‒
	LEIS-M6/8-T-NUT-ST				‒
	LEIS-M8/10-T-NUT-ST		‒
Connector sets (parallel connectors)
	VBS-PVB8				‒
	VBS-PVB10		‒
	VBS-PVB8/10
Slot closing strips
	NAD-5×5,7			‒	‒
	NAD-8×4,5				‒
	NAD-8×11,5				‒
	NAD-10×6,5		‒

	Suitable.
	Suitable and T-strips must already have been inserted at the time of despatch.

Design and safety guidelines

The following pages describe exclusively the differences between the tandem actuators and the linear actuators.

Deflection

The deflection of tandem actuators is essentially dependent on the support spacing, the rigidity of the support rail, the adjacent construction and the bearing arrangement. As the rigidity of these components increases, the deflection of the support rail is reduced.

Diagrams

The diagram values are determined for a bearing arrangement or clamping which is in theory infinitely rigid and are subdivided into locating/non-locating and locating/locating bearing arrangements.

The deflection of the support rail is valid under the following conditions:

• support rail unit comprising carrier profile and guideway
• support spacings up to 5 850 mm
• introduction of the load at the centre of the carriage unit if this is at the centre point between the bearing points.

Deflection about the z axis



MDKUVE15..-KGT

Locating/non-locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the z axis



MDKUVE15..-KGT

Locating/locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the y axis



MDKUVE15..-KGT

Locating/non-locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the y axis



MDKUVE15..-KGT

Locating/locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the z axis



MDKUVE25..-KGT · MDKUSE25..-KGT

Locating/non-locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the z axis



MDKUVE25..-KGT · MDKUSE25..-KGT

Locating/locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the y axis



MDKUVE25..-KGT · MDKUSE25..-KGT

Locating/non-locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the y axis



MDKUVE25..-KGT · MDKUSE25..-KGT

Locating/locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the z axis



MDKUVE35..-KGT

Locating/non-locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the z axis



MDKUVE35..-KGT

Locating/locating bearing arrangement · Δ_vy = deflection · l = support spacing

Deflection about the y axis



MDKUVE35..-KGT

Locating/non-locating bearing arrangement · Δ_vz = deflection · l = support spacing

Deflection about the y axis



MDKUVE35..-KGT

Locating/locating bearing arrangement · Δ_vz = deflection · l = support spacing

Idling drive torque

The idling drive torque M₀ of linear actuators with screw drive is calculated as a function of the spindle speed and the horizontal (M_0h) or vertical (M_0v) mounting position. The idling drive torque increases with increasing travel velocity.

Idling drive torque Horizontal mounting position



MDKUVE15..-KGT/..-F · MDKUVE15..-KGT/..-FM

n = spindle speed · M_0h = idling drive torque

Idling drive torque Vertical mounting position



MDKUVE15..-KGT/..-F · MDKUVE15..-KGT/..-FM

n = spindle speed · M_0v = idling drive torque

Idling drive torque
Horizontal mounting position



MDKUVE25..-KGT/..-F · MDKUVE15..-KGT/..-FM · MDKUSE25..-KGT/..-F · MDKUSE25..-KGT/..-FM

n = spindle speed · M_0h = idling drive torque

Idling drive torque
Vertical mounting position



MDKUVE25..-KGT/..-F · MDKUVE15..-KGT/..-FM · MDKUSE25..-KGT/..-F · MDKUSE25..-KGT/..-FM

n = spindle speed · M_0v = idling drive torque

Idling drive torque Horizontal mounting position



MDKUVE35..-KGT/..-F · MDKUVE35..-KGT/..-FM

n = spindle speed · M_0h = idling drive torque

Idling drive torque Vertical mounting position



MDKUVE35..-KGT/..-F · MDKUVE35..-KGT/..-FM

n = spindle speed · M_0v = idling drive torque

Length calculation of tandem actuators

The length calculation of tandem actuators is based on the required effective stroke length N_H . The effective stroke length N_H must be increased by the addition of safety spacing values on both sides of the travel distance.

The total length L_tot of actuators is determined from the support rail length L₂ and the lengths of the end plates L₄ and L₅. If two carriage units are present, both carriage unit lengths L and the spacing L_x1 must be taken into consideration.

Parameters for length calculation

GH	mm	Total stroke length
NH	mm	Effective stroke length
S	mm	Safety spacing, see table
L	mm	Length of carriage plate
L2	mm	Length of support rail
L4	mm	Length of end plate
L5	mm	Length of end plate
Ltot	mm	Total length of actuator
Lx1	mm	Spacing between two carriage units
BL	mm	Effective length of bellows
FBL		Effective length factor according to actuator type.

Total stroke length

The total stroke length G_H is determined from the required effective stroke length and the safety spacings, which must correspond to at least the spindle pitch P.



Support rails

Actuators with monorail guidance system and ball screw drive are only available with a single-piece support rail. The maximum length of a support rail is 5 850 mm.

Spacing L_x1 between carriage units

The minimum spacing L_x1 min between two carriage units is 20 mm.

Total length L_tot and support rail length L₂

The following ➤ equtions are designed for one and two carriage units. The parameters and their position can be found in ➤ Figure, ➤ Figure and the table. If more than two carriage units are present, please contact us.

Length parameters for one carriage unit



One carriage unit with bellows



Total length



Length parameters for two carriage units



Two carriage units with bellows



Total length



Length parameters

Designation	L	L4	L5	S	FBL
	mm	mm	mm	mm
MDKUVE15-240-KGT/5-N	240	28	28	5	1,15
MDKUVE15-240-KGT/10-N				10
MDKUVE15-240-KGT/20-N				20
MDKUVE15-240-KGT/50-N				50
MDKUVE15-240-KGT-OA-N	240	‒	28	10
MDKUVE25-365-KGT/5-N	365	33	28	5	1,18
MDKUVE25-365-KGT/10-N				10
MDKUVE25-365-KGT/20-N				20
MDKUVE25-365-KGT/40-N				40
MDKUVE25-365-KGT-OA-N	365	‒	28	10
MDKUSE25-365-KGT/5-N	365	33	28	5	1,18
MDKUSE25-365-KGT/10-N				10
MDKUSE25-365-KGT/20-N				20
MDKUSE25-365-KGT/40-N				40
MDKUSE25-365-KGT-OA-N	365	‒	28	10
MDKUVE35-500-KGT/5-N	500	48	30	5	1,1
MDKUVE35-500-KGT/10-N				10
MDKUVE35-500-KGT/20-N				20
MDKUVE35-500-KGT/40-N				40
MDKUVE35-500-KGT-OA-N	500	‒	30	10

Effective length of bellows

The effective length of bellows is the length occupied by the bellows in the fully compressed state. Calculation is based on the total stroke length G_H , ➤ Figure, ➤ equtions and table.

Effective length calculation





 Carriage unit against the right end stop ·



 Carriage unit against the left end stop


BL	mm	Effective length of bellows
GH	mm	Total stroke length
FBL	–	Effective length factor according to actuator type, see table.

Mass calculation

The total mass of an actuator is calculated from the mass of the actuator without a carriage unit, the carriage unit and the special design: second carriage unit (WN2), ➤ Figure. Insert the values from the table in the following ➤ equation. The values m_LAW and m_BOL are mandatory.



Basic and additional designs





 Basic design ·



 Second carriage unit (WN2)

Values for mass calculation

Designation	Mass
	Carriage unit	Design WN2	Actuator without carriage unit
	mLAW	m3	mBOL
	≈kg	≈kg	≈kg
MDKUVE15-240-KGT..-N	4,61	4,2	(Ltot – 56)  ·  0,0177 + 3,51
MDKUVE15-240-KGT-OA..-N	4,2	4,2	(Ltot – 56)  ·  0,0177 + 2,53
MDKUVE25-365-KGT..-N	13,04	11,48	(Ltot – 61)  ·  0,0372 + 7,56
MDKUVE25-365-KGT-OA..-N	11,48	11,48	(Ltot – 56)  ·  0,0372 + 5,36
MDKUSE25-365-KGT..-N	12,84	11,28	(Ltot – 61)  ·  0,0380 + 7,56
MDKUSE25-365-KGT-OA..-N	11,28	11,28	(Ltot – 56)  ·  0,0380 + 5,36
MDKUVE35-500-KGT..-N	34,7	28,41	(Ltot – 78)  ·  0,0797 + 22,21
MDKUVE35-500-KGT-OA..-N	30	28,41	(Ltot – 60)  ·  0,0797 + 13,21

Lubrication

The information on the lubrication of tandem actuators matches the information on the lubrication of linear actuators. The only differences are in the relubrication quantities and relubrication points.

Relubrication quantities

Relubrication should be carried out wherever possible with several partial quantities at various times instead of the complete quantity at the time of the relubrication interval. Relubrication quantities, see table.

Grease quantities

Tandem actuator	Relubrication quantity per driven carriage unit, lubrication nipple and longitudinal face		Relubrication quantity per non-driven carriage unit, lubrication nipple and longitudinal face
	Drive side	Non-locating bearing side	Drive side	Non-locating bearing side
	≈g	≈g	≈g	≈g
MDKUVE15-240-KGT/5-F MDKUVE15-240-KGT/5-FM MDKUVE15-240-KGT/10-F MDKUVE15-240-KGT/10-FM MDKUVE15-240-KGT/20-F MDKUVE15-240-KGT/50-F	2 to  3	1 to 2	1 to 2	1 to 2
MDKUVE25-365-KGT/5-F MDKUVE25-365-KGT/5-FM MDKUVE25-365-KGT/10-F MDKUVE25-365-KGT/10-FM MDKUVE25-365-KGT/20-F MDKUVE25-365-KGT/20-FM MDKUVE25-365-KGT/40-F	6 to  9	3 to 5	3 to 5	3 to 5
MDKUSE25-365-KGT/5-F MDKUSE25-365-KGT/5-FM MDKUSE25-365-KGT/10-F MDKUSE25-365-KGT/10-FM MDKUSE25-365-KGT/20-F MDKUSE25-365-KGT/20-FM MDKUSE25-365-KGT/40-F	8 to 12	6 to 8	6 to 8	6 to 8
MDKUVE35-500-KGT/5-F MDKUVE35-500-KGT/5-FM MDKUVE35-500-KGT/10-F MDKUVE35-500-KGT/10-FM MDKUVE35-500-KGT/20-F MDKUVE35-500-KGT/20-FM MDKUVE35-500-KGT/40-F	7 to 11	4 to 6	4 to 6	4 to 6

Relubrication points

Each carriage unit in a tandem actuator with linear recirculating ball bearing and guideway assembly and ball screw drive is equipped with four funnel type lubrication nipples according to DIN 3405‑A M6. It can be lubricated from either the left or right side. On the drive side, lubrication nipples are located to the left and right longitudinal sides of the carriage unit through which the front carriages and spindle nut can be relubricated. The carriages on the non-locating bearing side can be relubricated via a further countersunk lubrication nipple on each longitudinal side of the carriage unit, ➤ Figure.

Lubrication points



MDKUVE..-KGT · MDKUSE..-KGT



 Funnel type lubrication nipple DIN 3405‑A M6

ATTENTION

During lubrication of actuators, all lubrication points on one longitudinal side of a carriage unit must always be provided with lubricant.

Position of relubrication points

Designation	Mounting dimensions
	S56	h56	l56	l57
	mm	mm	mm	mm
MDKUVE15..-KGT..-N	15	20	70,3	99,4
MDKUVE25..-KGT..-N	15	28	95,85	173,3
MDKUSE25..-KGT..-N	15	28	82,8	199,4
MDKUVE35..-KGT..-N	36	30	122,5	255

Position of relubrication points



T-slots

The T-slots in the support rail and the carriage unit are designed for T-bolts according to DIN 787 and T-nuts according to DIN 508, ➤ Figure.

Sizes of T-slots in support rail and carriage unit





 T-slot size 10 ·



 T-slot size 8, type B ·



 T-slot size 5 ·



 T-slot size 8, type C

Dimensions of T-slots

Designation	Support rail		Carriage unit
	Lateral	Bottom	Top	Lateral
MDKUVE15..-KGT
MDKUSE15..-KGT		‒	‒	‒
MDKUVE25..-KGT
MDKUSE25..-KGT
MDKUVE35..-KGT

Filling openings

The filling openings in the non-locating bearing units of the tandem actuators are used for the insertion of T-nuts and T-bolts in the T‑slots of the support rail. The filling openings are arranged at the centre of the carriage unit.

Connectors for switching tags

Switching tags can be screw mounted to the carriage unit in order to activate switches in the adjacent construction. The position and size are dependent on the size, ➤ Figure and table.

Connectors for switching tags on the carriage unit



Mounting dimensions for switching tags

Designation	T-slot	Mounting dimensions
		h58
		mm
MDKUVE15..-KGT		19,3
MDKUVE25..-KGT		23
MDKUSE25..-KGT		23
MDKUVE35..-KGT		28

Maximum permissible spindle speed

The data on the maximum permissible spindle speed of the tandem actuators matches the data for linear actuators.

Diagram

The diagram is valid for tandem actuators with and without spindle supports, ➤ Figure.

Maximum permissible spindle speed



MDKUVE..-KGT · MDKUSE..-KGT

n = maximum permissible spindle speed · L₂ = support rail length ·



 Without spindle support ·



 One spindle support ·



 Two spindle supports

Kinematic operating limits

Actuator	Acceleration a	Maximum velocity v	Maximum spindle speed n
	m/s2	m/s	min–1
MDKUVE15-240-KGT/5-F	20	0,29	3 500 **
MDKUVE15-240-KGT/5-FM	10
MDKUVE15-240-KGT/10-F	20	0,5	3 000
MDKUVE15-240-KGT/10-FM	10
MDKUVE15-240-KGT/20-F	20	1,16	3 500 **
MDKUVE15-240-KGT/50-F	20	2,9	3 500 **
MDKUVE25-365-KGT/5-F	20	0,215	2 600 **
MDKUVE25-365-KGT/5-FM	10
MDKUVE25-365-KGT/10-F	20	0,43
MDKUVE25-365-KGT/10-FM	10
MDKUVE25-365-KGT/20-F	20	0,86
MDKUVE25-365-KGT/20-FM	10
MDKUVE25-365-KGT/40-F	20	1,73
MDKUSE25-365-KGT/5-F	20	0,215	2 600 **
MDKUSE25-365-KGT/5-FM	10
MDKUSE25-365-KGT/10-F	20	0,43
MDKUSE25-365-KGT/10-FM	10
MDKUSE25-365-KGT/20-F	20	0,86
MDKUSE25-365-KGT/20-FM	10
MDKUSE25-365-KGT/40-F	20	1,73
MDKUVE35-500-KGT/5-F	20	0,18	2 200 **
MDKUVE35-500-KGT/5-FM	10
MDKUVE35-500-KGT/10-F	20	0,36
MDKUVE35-500-KGT/10-FM	10
MDKUVE35-500-KGT/20-F	20	0,73
MDKUVE35-500-KGT/20-FM	10
MDKUVE35-500-KGT/40-F	20	1,46

^** Restricted by the limiting speed of the locating bearing with grease lubrication.

Accuracy

Length tolerances

The information on the length tolerance of tandem actuators matches the information on the length tolerance of linear actuators.

Straightness of support rails

The information on the straightness of the support rails of tandem actuators matches the information on the straightness of the support rails of linear actuators. Values for the straightness tolerances of support rails of tandem actuators, see table.

Tolerances

Length L2 of support rail				MDKUVE15..-KGT			MDKUSE25..-KGT MDKUVE25..-KGT			MDKUVE35..-KGT
				t2	t3	Torsion	t2	t3	Torsion	t2	t3	Torsion
mm				mm	mm	mm	mm	mm	mm	mm	mm	mm
		L2 ≦	1 000	0,6	0,5	0,5	0,8	0,7	0,5	0,8	0,7	0,8
1 000	＜	L2 ≦	2 000	1	0,7	1	1,2	0,9	1	1,6	1,4	1,2
2 000	＜	L2 ≦	3 000	1,4	0,9	1,5	1,6	1,1	1,5	2,4	2,1	2
3 000	＜	L2 ≦	4 000	1,7	1,2	2	1,9	1,4	2	3,2	2,8	2,4
4 000	＜	L2 ≦	5 000	2,1	1,4	2,5	2,3	1,6	2,5	4	3,5	2,8
5 000	＜	L2 ≦	5 850	2,7	1,7	3	2,9	1,9	3	4,8	4,2	3,3

Measurement method for straightness tolerances



t₂, t₃ = straightness tolerance

Pitch accuracy of spindle

The information on the pitch accuracy of the spindle in tandem actuators matches the information on the pitch accuracy of the spindle in linear actuators. Values for the ball screw drive in tandem actuators, see table.

Designs of spindle and spindle nut

Designation	Spindle			Spindle nut (F = single nut, FM = double nut)
	⌀ d0	P	Pitch accuracy	Suffix	Axial clearance
					max.
	mm	mm	μm/300 mm		mm
MDKUVE15-240-KGT	20	5	50	F	0,05
				FM	Preloaded
		10		F	0,05
				FM	Preloaded
		20		F	0,05
		50
MDKUVE25-365-KGT MDKUSE25-365-KGT	32	5	50	F	0,05
				FM	Preloaded
		10		F	0,05
				FM	Preloaded
		20		F	0,05
				FM	Preloaded
		40		F	0,05
MDKUVE35-500-KGT	40	5	50	F	0,05
				FM	Preloaded
		10		F	0,05
				FM	Preloaded
		20		F	0,05
				FM	Preloaded
		40		F	0,05

Actuators MKKUVE..-KGT correspond in their basic design and technical characteristics to the actuators MKUVE..-KGT. The features of clamping actuators substantially match the features of linear actuators. The differences are described on the following pages.

In the case of clamping actuators, the carriage units move in synchronised opposing directions.

Spindle support

Actuators MKKUVE20..-KGT/5 with a total length of more than 2 000 mm can be fitted with movable spindle supports (suffix SPU).