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Have you had such a case?

Difficulty in matching fit?

Due to the combined tolerances of the bush bore diameter and the shaft diameter, accuracy can be affected by 'clearance' or increased dynamic friction caused by preloading.

Obtaining the proper fit?

In some extreme cases, slide bush and shaft assembly was avoided due to uncontroled clearance issues. As a result alternative linear guide had to be used and production cost increased.

Part Number Structure

*Refere to our latest general catalog for details.
*Please specify on the drawing about the shaft machining, radial clearance, match-making, etc.

Recommended radial clearance

Depending on the application, the range varies. Please use the chart below for a guideline.

Slide Bush: Negative radial clearance limit

Negative clearance is opted to reduce backlash. Please refer to the chart below for the recommended negative clearance (preload) limit.

*Off-centered housing bore can cause uneven loading on the Slide Bush. Please pay special atention to
 the centering of the housing especially when negative clearance is required.
*Please contact NB for assistance when extra preload is required for other NB products such as SRE, SR,
 etc.

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Required load capacity and accuracy must be calculated according to the application conditions in order to select appropriate linear system.      Please refere to the Engineering Information page.
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