18
Grinding Operations
Selecting Grinding Wheels
WARNING
Before using a grinding wheel, be certain that its maximum safe
operating speed is not exceeded by the nameplate speed of the
grinder. Do not exceed the recommended wheel diameter.
Disc Grinding Wheels
Grinding wheels should be carefully selected in order to use the grinder most efficiently.
Wheels vary in type of abrasive, bond, hardness, grit size, and structure. The correct type of
wheel to use is determined by the job. Use disc grinding wheels for fast grinding of structural
steel, heavy weld beads, steel casting, stainless steel, and other ferrous metals.
Grinding Tips
Efficient grinding is achieved by controlling the
pressure and keeping the angle between wheel
and the workpiece at 10° to 15° (Fig. 9).
If the wheel is too flat, the tool is difficult to
control. If the angle is too steep, the pressure is
concentrated on a small area causing burning
to the work surface.
WARNING
Use clamps or other
practical way to secure
and support the workpiece to a stable
platform. Holding the work by hand or against
your body is unstable and may lead to loss of
control and injury.
WARNING
Excessive or sudden
pressure on the wheel will
slow the grinding action and put dangerous stresses on the wheel.
NOTICE: When grinding with a new wheel, be certain to always grind while pulling the tool
backwards until the wheel becomes rounded on its edge. New wheels have sharp corners that
tend to “bite” or cut into work piece when pushing them forward.
15
O
Fig. 9
