Sharp SH-920 Instruction Manual page 33

3.1.3 Move the first balance weight "G" opposite to point "S" and set it.
(Fig.15)
3.1.4 Move two correction weights "K" anywhere round the periphery, but
at equal distance "a" from weight "G". (Fig.16)
3.1.5 Turn the wheel through 90 degree and to see whether it is in
balance. If not, the correction weight "K" must change place until no
oscillation occur in every position or the wheel is in balance. (Fig.17)
3.1.6 Dressing: Mount the wheel onto the spindle, dressing it (especially
for new wheel), make it concentric with rotation center.
3.1.7 Rebalance: after dressing, the wheel may lose its balance, so that
the rebalancing operation is necessary.
3.1.8 After balancing, the wheel must be given a test run of grinding
operation at least five minutes at full working speed before it is being
used.
3.2 Mount the wheel flange assembly:
Prior to get the flange-mounted grinding wheel to the grinding spindle,
operators must be taken to ensure the flange cone bore and spindle taper
are in absolutely clean condition. After that the wheel is pushed by hand
onto the spindle taper, and subsequently, tighten wheel flange assembly
securely with fixed bolt (Fig.12). Release wheel flange assembly from
spindle taper will be effected by using jack bolt (Fig.13).
3.3 How to check the wheel vibration:
If the spindle vibrates significantly please take off the wheel assembly first,
and then switch on the spindle and proceed to check with the following
precautions:
3.3.1 If no vibration occurred it means the wheel balance is no good,
please rebalance it.
3.3.2 If the spindle is still vibrate, please disassemble the motor and
spindle cartridge, and check the rubber coupling and coupling refer
SD 50008A Index NO. 1, if the rubber coupling is found broken,
change a new one, if couplings found loosen set it well.
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