Corrosion-free bearing blocks for lead screws
dryspin® laser sintering bearing blocks

Practical lead screw bearing blocks are available for thread sizes 6 - 24mm. Options for mounting with plain bearings or ball bearings (BB) with higher dynamics. All lead screw support blocks, like the matching lead screw clamp rings, are supplied in hard anodised aluminium.

► Lubrication-free and maintenance-free
► Housing for lead screw support ► Mounting holes for your housing
► Prepared for connecting accessories, e.g. position indicators and manual clamps
► Laser sintering bearing blocks available for lead screws of 6 - 20mm diameter
► Versions for TR and DS threads

FL: fixed bearing with anodised clamping ring with right-hand thread and lubrication-free iglidur® plain bearing
LL: floating bearing with lubrication-free iglidur® plain bearing
LH: left-hand thread option, only TR10x2, TR10x3, TR18x4 and TR24x5


_________________________________________________________________________________________

Why are there different versions?

To determine the application parameters we must consider the position and direction of the forces within the system. To control these forces and ensure correct operation we use fixed and floating bearings. The fixed type are used to control the accuracy and the floating bearings are used to allow for misalignment. There are different bearing options, e.g. the fixed/floating bearing and the double-sided floating/floating bearing.


Fixed/floating bearing:
The fixed bearing clearly positions the shaft in an axial direction. The fixed bearing must therefore absorb both radial and axial forces and guide them into the surrounding structure. This can basically be done by a single bearing. The floating bearing corrects parallelism errors and offers thermal expansion capability, which means that the cable is not stressed.

Advantages of fixed/floating bearing
► No axial clearance
► Shaft expansion (e. g. due to temperature) uncritical
► Suitable for changing axial loads
► Unambiguity of the acting forces 


Floating/floating bearing:
In a floating/floating bearing, the lead screw is not clearly fixed in the axial direction. This means that mechanical or thermal changes in length can be absorbed without causing stress on the bearing, however the lead screw is not protected against movement. This has to be considered in particular when dealing with positioning applications.

Benefits of floating/floating bearing:
► Cost-effective
► Low design efforts
► Shaft expansion (e. g. due to temperature) in the area of clearance, uncritical

Disadvantages:
► Not clearly fixed in the axial direction
► Not suitable for alternating axial loads
► Only when axial clearance does not affect the function


_________________________________________________________________________________________________

Versions 

Fixed bearing version (FL):
Depending on the thread dimension, in this version it is clamped into the thread itself or onto the outer diameter of the lead screw. For high helix lead screws, it is always the outer diameter that it is clamped to.

► Note: You can also choose a bearing block for your application that uses the measurement d1 for clamping onto the turned machined end.


Floating bearing (FL):
Depending on the lead screw's dimensions, a machined end has to be turned to the value d1. You can see below which dimensions this applies to. The floating bearing block merely supports the lead screw. This type does not prevent the lead screw from drifting.


Ball bearing version (BB):
This bearing block should always be used when the application is highly dynamic, such as when using a motor


_________________________________________________________________________________________

Design tip for lead screw end machining:
 

Part number	d1 mm
SLS-16x2-LL	12
SLS-16x4-LL	12
SLS-18x4-LL	12
SLS-18x8P4-LL	12
SLS-18x24-LL	12
SLS-18x100-LL	12
SLS-20x4-LL	12
SLS-24x5-LL	14
SLS-S16-LL	12
SLS-S18-LL	12
SLS-S20-LL	12

► Note on maximum load capacity: it can exceed the lead screw nut's maximum load