(3) Resetting the tool rest. Each time that a wheel
is dressed, check the clearance between the tool rest
and the wheel. Reestablish the clearance at 1/16-inch
f. Operation of Electric Grinder. The grinder can be
used to dress points on chisels, screwdrivers, and drills.
It can be used for removing excess metal from work and
smoothing metal surfaces.
(1) Use of other types of wheels. The grinding
wheels are removable. The grinders are usually
designed so that wire brushes, polishing wheels, or
buffing wheels can be substituted for the abrasive
Do not use side of wheel for grinding.
(2) Use of side of wheel. As a rule, it is not good
practice to grind work on the side of an abrasive wheel.
When an abrasive wheel becomes worn, its cutting
efficiency is reduced because of a decrease in surface
speed. When a wheel becomes worn in this manner, it
should be discarded and a new one installed.
Under no condition shall the wheel,
when used in wet grinding, stand
partially immersed in water. This will
cause the water-soaked portion of the
wheel to become heavy and the wheel
to become thrown out of balance.
(3) Use of water. Some grinders are equipped with
water pumps which pump a steady stream of water over
the work. When grinder is not equipped with a water
pump, the work should be immersed in water often
enough to prevent overheating.
(4) Grinding soft materials. Do not grind soft
substances such as aluminum or brass as these
materials will clog the pores of the grinding wheel and
stop its cutting action. A clogged or glazed wheel
should be dressed to obtain proper cutting action.