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Customized Bearing

Recirculating Units

Type comparison recirculating units



Type SK

Type SKD

Type SKC

Type SR

Type NRT / NRV

Loading capacity

Running characteristics

Rigidity

Requirements on accuracy and rigidity of the surrounding structure

Lubrification free capability

High operating temperature



  • Type SK
  • Type SKD
  • Type SKC
  • Type SR
  • Type NRT/NRV

Ball recirculating units type SK

The very precise MONORAIL profiled guide ways are used worldwide in many machine tool applications. A widespread product program is covering the requirements from small manipulators till heavy chipping processes.


MONORAIL MR

The type SK recirculating unit is equipped with balls and is suitable for low to medium loading. It is used with SCHNEEBERGER type R or RD linear bearings and can be uniformly loaded in every direction. Hence, space saving designs may be realized. Some sizes can be additionally fitted with damping elements (type designation SKD). These provide smoother operation but also have a somewhat reduced load carrying capacity.



Sizes

1, 2, 3, 6, 9, 12


Lengths

22 to 200 mm



 

Type comparison recirculating units



Type SKType SKDType SKCType SRType NRT / NRV
Loading capacity
Running characteristics
Rigidity
Requirements on accuracy and rigidity of the surrounding structure
Lubrification free capability
High operating temperature

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Ball recirculating units type SKD

The type SKD recirculating unit is equipped with balls and is suitable for low to medium loading. It is used with SCHNEEBERGER type R or RD linear bearings and can be uniformly loaded in every direction. Hence, space saving designs may be realized. Some sizes can be additionally fitted with damping elements (type designation SKD). These provide smoother operation but also have a somewhat reduced load carrying capacity.

Sizes

6, 9, 12

Lengths

100 to 200 mm


 

Type comparison recirculating units



Type SKType SKDType SKCType SRType NRT / NRV
Loading capacity
Running characteristics
Rigidity
Requirements on accuracy and rigidity of the surrounding structure
Lubrification free capability
High operating temperature

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Ball recirculating unit type SKC

The recirculating unit type SKC provides unlimited stroke and equal load carrying capacity in all directions. The SKC, designed for low-to-medium loading conditions, operates dry – lubrication is not required!

These units, used with SCHNEEBERGER linear bearings type R or RD, are drop-in replacements for SCHNEEBERGER SK and SR recirculating units. The combination of coated stainless steel, ceramic and teflon makes this recirculating unit suitable for lubrication free operation in high vacuum and clean room applications.



Sizes

3, 6

Lengths

75 - 100 mm


 

Type comparison recirculating units



Type SKType SKDType SKCType SRType NRT / NRV
Loading capacity
Running characteristics
Rigidity
Requirements on accuracy and rigidity of the surrounding structure
Lubrification free capability
High operating temperature

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Roller recirculating unit type SR

The SR recirculating unit has cross rollers and is suitable for medium to high loading. Dimensionally interchangeable with type SK, the type SR is also used with SCHNEEBERGER type R or RD linear bearings, but offers greater load carrying capacity and rigidity.



Sizes

2, 3, 6, 9, 12

Lengths

32 to 200 mm


 

Type comparison recirculating units



Type SKType SKDType SKCType SRType NRT / NRV
Loading capacity
Running characteristics
Rigidity
Requirements on accuracy and rigidity of the surrounding structure
Lubrification free capability
High operating temperature

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Recirculating unit type NRT and preload wedge type NRV

The roller recirculating units NRT are designed for medium to heavy loads, high rigidity and high precision. Together with suitable SCHNEEBERGER linear bearings, adjusting wedge or attaching part ingenious constructions can be realized.

These wedges are used normally to adjust the preload. At the same time, by suitably shaping the cylindrically ground wedge bars, small angular deviations and deformations in the surrounding construction can be compensated. The parts are made from hardened steel.

Material

NRV
hardened steel

Standard version

The design of the twin race recirculating unit type NRT, is based on a through hardened, highly accurately ground steel careier and two plasic components to recirculate the rollers. On each front face there is a double lipped wiper and a lubricating nipple. There is also an additional lubricating hole in the roller return passage.

NRTSteel body: trough hardened, very precisely ground steelRecirculation: plastic


 

Type comparison recirculating units



Type SKType SKDType SKCType SRType NRT / NRV
Loading capacity
Running characteristics
Rigidity
Requirements on accuracy and rigidity of the surrounding structure
Lubrification free capability
High operating temperature

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