Sharp SH-920 Instruction Manual page 32

(C) WHEEL
Wheel Mounting
1.
1.1 The grinding wheel should be checked carefully before mounted by tapping
it with a wood hammer to ensure that a clear sound is detected. A wheel
having a crack inside it may result a sonant sound. Be sure that no crack is
detected.
1.2 Two pieces of paper washers should be placed on each side of wheel and
serve as elastic packing between wheel and flange.
1.3 The screws for fixing the flange should be tightened gradually and in
diagonal sequence, the wrench should be applied step by step to each
screw in turn.
1.4 When the wheel runs under coolant for some time the paper packing
washers may be damaged, the fixing screws should be retightened in
diagonal sequence again.
Check wheel mounting before operation. It is essential to check the
2.
following points before start for grinding operations.
2.1 Wheel guard is in its right position.
2.2 Turn the wheel in no load condition for a few minutes.
Wheel Balancing
3.
3.1 Efficient balancing is essential to eliminate the unnecessary and additional
stress to be build-up in the wheel. High-quality grinding results, such as
grinding accuracy, surface finish as well as the extended life of grinding
wheel, wheel spindle and bearings, depend to a considerable extent on
careful balancing.
Usually the static balancing will be sufficient. The grinding wheel together
with its mounting flange should be fitted to balancing arbor and then place it
on the wheel balancer. And the balancing operations proceed as following:
3.1.1 The wheel balancer must be leveled first (Fig.9), and check it by a
spirit.
3.1.2 Lay the wheel to oscillate, in order to find out the center of gravity,
then mark its downward position S with chalk. (Fig.14)
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