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4 1/4-Inch Disc Grinder Operator's Manual 13
Operation
8. Test the grinder before using:
Before actually beginning the grinding work, test the grinder by first clearing the
area of all other personnel. Make sure the wheel guard is in place and that you are
wearing eye protection. Turn the grinder “on”, and make sure the grinder runs
smoothly and shows no abnormalities.
Duration of the trial run is as follows:
When depressed center wheel is replaced 3 minutes or more
When starting daily work 1 minute or more
9. Use only properly rated depressed center wheels:
Use only depressed center wheels rated at 13300 RPM or more.
Using a depressed center wheel rated less can lead to wheel disintegration during
operation and serious bodily injury.
10. Check the lock pin:
Make sure that the lock pin is disengaged by pushing lock pin two or three times
before turning on the grinder.
OPERATION:
1. Hold the grinder firmly by its housing and side handle (Fig. 1).
The grinder produces a counterforce which must be controlled by firmly holding onto
the grinder.
2. Turn the grinder “on”:
While holding the grinder firmly, use one finger to slide the switch to the “on”
position.
3. Use light grinding pressure:
There is no need to press hard when grinding. Usually the grinder’s own weight is
sufficient to allow the required light contact with the surface to be ground.
WARNING: DO NOT PRESS THE GRINDER FORCIBLY AGAINST THE
SURFACE TO BE GROUND. HEAVY PRESSURE CAN RESULT IN
WHEEL BREAKAGE AND SERIOUS INJURY. IT CAN ALSO
DAMAGE THE SURFACE BEING GROUND OR DAMAGE THE
GRINDER’S MOTOR.
4. Use proper grinding angle.
Grind only with the wheel’s edge by lifting the grinder 15° to 30°, as shown in Fig. 2.
CAUTION: DO NOT USE THE ENTIRE SURFACE OF THE DEPRESSED
CENTER WHEEL. USE ONLY THE EDGE OF THE DEPRESSED
CENTER WHEEL.
PRE-OPERATION (CONTINUED):