Specialist knowledge | Design

Fixing the guide shaft

Other than the guide bush, the guide shaft can be clamped or installed with interference fit.

A radially loaded rotary stroke bearing will be affected by elastic deformations at the rolling surfaces and also on the guide shaft. The rigidity of the guide shaft is essentially determinded by the fixing used.

With a relatively high load, long shaft length and the requirement for high guide accuracy over the entire stroke path, at least at one end the clamping length should be designed with a length s ≥ 1.5 · dw .

In case of one-sided clamping (cantilever beam), apply the load as close to the clamping side as possible.

Interference fit

Produce a mounting bore, e.g. ISO-R6, with an accurately aligned axis position. The deviation of the parallelism of two paired shafts should not be greater than the amount of preload.

Clamps in mounting bore e.g. ISO-H6

  • Indirectly using a slotted and draw screw.
  • Directly using a pressure screw. For this purpose, flatten the shaft end slightly, drill or screw in to secure in the longitudinal direction.

Clamping in the V-block

  • Using a clamp
  • Using a draw screw


The mounting bores for the shaft can be manufactured with a fitting tolerance, e.g. ISO F7-G7, to prevent distortions of the shaft and ball-bearing guide in the event of badly aligned mounting bores. Glue the shaft in the final assembly together with the ball-bearing guide and leave to cure in an aligned position. The instructions provided by the adhesive manufacturer regarding the adhesive gap, curing time, etc. must be observed.

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