High Precision Ball Bearings - Kraftmek

Spacers
By fitting spacers with matched bearings the following
is achieved:
• The spread H (with DF and DB arrangement) is
increased
• Frictional heat is dissipated more effectively
• Lubrication of the bearing (oil lubrication) is improved
as a result of better oil flow
The spacer width should correspond to at least the width
of a single bearing.
Care must be taken to ensure good plane parallelism of
spacers (see "accuracy of associated components").
Both spacers must be face ground in one setting.
A change of preload is possible with matched pairs of
bearings by means of spacers.
If the spacer on the shaft is smaller than the spacer in
the housing, then…
• Preload will be decreased with DF arrangement
• Preload will be increased with DB arrangement
The necessary dimensions for the spacers can be
obtained on request.
B
B
Universal matching
Matched bearings are universally ground as standard.
All bearings of identical size and match can be mounted
in pairs or sets in DF, DB or DT arrangements.
Gauge matching
Bearings matched in this way come in pairs or sets and
may not be mixed with bearings from a different box.
The bearings within a set are numbered consecutively.
26