LINEAR MOTION SYSTEMS

Simplicity ® Plane Bearings
Design Notes - Polymer Series
Linear Motion Systems
TOLERANCE
Polymer plane bearings are suitible as press-in bu shing,
preferably used in housings with tolerance H7. The press fit
oversize depends on the nominal diameter and the respective
material. The press fit oversize is about 0.5 - 1.5% according
to the chosen diameter.
After assembly in the inside diameter adjusts itself to the
nominal value. A certain clearance in the bearing is necessary
to guarantee faultless operation under all operational
conditions. Inside diameter lies in the ran ge of tolerance F10
according to compound.
Shafts are mainly in tolerance h9 - h7. The ideal sliding
counterpart is steel with a ground surface (surface roughness
value with parameter Ra 0.4 to 0.8 m) and a minumum
hardness of 50 HRC. Apart from hardened steel nearly all
other common shaft materials can be used: stainless steel,
carbon steel, non-ferrous metals and plastics. Special
compounds are available for soft shafts made for example
out of non-ferrous metals or alumi num alloys. Thus, we can
achieve very low to no wear in the sliding counterpart.
For special applications please contact us. We are able
to formulate service life on the basis of our tests for and
experience from a huge number of applications.
MACHINING
Polymer plane bearings can be reworked without problem.
Milling, turning on a lathe, sawing or cutting can be done,
however, please do not alter I.D.
LUBRICATION
Compound plane bearings are self-lubricating and therefor
maintenance-free. Nevertheless, initial lubrication during
assembly or cooling by environmental media can multiply
loading capacity and service life. The compounds are resistant
against most of the common greases and oils. Detailed
information can be obtained from the chemicals resistance list in
this catalog or you can receive a detailed list on request.
ASSEMBLY
It is preferable to press polymer plane bearings into the
housing with an arbor parallel to the axis. The one-sided
chamfer on the bearing simplifies assembly. A similar chamfer
should also be part of the housing.
Design Notes
Dhousing+2a
FD+1
ID-0.2
ID-0.2
WIDTH OF CHAMFER
L-1
L-1
ROUNDED EDGE
ROUNDED EDGE
FD
ID
L
ID
L
a
45°
OD
45°
OD
a
D housing
D housing
The data and specifi cations in this publication have been carefully compiled and are believed to be accurate and correct. However, it is the responsibility of the user to
determine and ensure the suitability of Pacifi c Bearing® products for a specifi c application. Pacifi c Bearing’s only obligation will be to repair or replace without charge,
any defective components if returned promptly. No liability is assumed beyond such replacement. *Consult www.pacifi c-bearing.com for the latest technical updates.
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