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9. SAFETY PRECAUTIONS
Bear in mind that the grinding wheel running at a very high speed can
hurt the careless operator anytime.
This danger, however, may be avoided by observing necessary precautions
as follows:
1. Limit to the grinding wheel size
Always use a wheel less than 8" in outside diameter. This is to use the
wheel within the prescribed peripheral speed range.
(The peripheral speed can be calculated by:
Wheel OD x 3.14159...X 2,900 rpm/50Hz, or
Wheel OD x 3.14159...x 3,400 rpm/60Hz)
If the peripheral speed is faster than the prescribed speed,
the centrifugal force might break the wheel which in turn will damage
the work and the machine, and even hurt the operator.
The larger the wheel OD, the faster the peripheral speed.
A wheel larger than 8" O0 can exceed the safety speed, hence this danger.
2. Confirm, before the main motor is turned on and the wheel starts to
rotate, that the spindle and the flange to which the wheel is set are
firmly fastened.
Make sure the wheel guard is closed while the wheel is running.
3. Once the grinding wheel begins to rotate, never touch it with your
hand or finger.
To implement this warning, follow the precautions as below:
a. When wiping or otherwise cleaning the magnetic surface:
i 1 Stop the main motor, or
1.2) Move the table either to left or right, or pull the saddle so that
the magnetic chuck will be sufficiently away from the running wheel.
(3) Make sure to lock the table at that position by the lever for
table locking 13.
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