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Technical data are subject to change without notice.
ISO 9001 certified. © Copyright SPM 1996-9. 71411.B
SPM Instrument AB • Box 4 • S-645 21 Strängnäs • Sweden
Tel +46 152 22500 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.se
Unpredicted, very rapid damage development is rare.
Normally, surface damage develops slowly, over a
period of many months. These are the general guide-
lines for selecting the interval between periodic read-
ings:
• The bearings should be checked at least once
every three months.
• The bearings in critical machinery and heavily
preloaded bearings (e.g. spindle bearings) should
be measured more often than ”normal” bearings.
• The bearings should be measured more
frequently when their condition is unstable (rising
or irregular readings).
• Damaged bearings should be closely watched
until they can be replaced.
This implies that one has to allow time for extra checks
on bearings in dubious or bad condition.
Check Stand-by Equipment
Vibration and corrosion can damage the bearings in
stand-by machines. Check bearing condition each time
such machines are being tested or used.
Synchronize with Lubrication
It may be necessary to synchronize regreasing and
measuring intervals. Grease lubricated bearings should
not be measured until they have run for approxi-
mately one hour after regreasing (except when doing
a lubrication test, see page 52).
Keep in mind that bad bearing condition is often
connected with lubrication problems. For grease lu-
bricated bearings, a lubrication test usually provides
the final proof for bearing damage. Make sure that
the right type and quantity of grease is used.
Measuring Intervals
Fig. 7
Measuring personnel
should know about:
• lubricant type
• maximum quantity
• lubricating intervals
1-3 months
several days,
one week
measure
often
Fig. 8
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