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Grinding Operations
ELECTING GRINDING WHEELS
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 workpiece at 10° to 15°. If the
wheel is 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.
Excessive or sudden
pressure on the wheel will
slow grinding action and put dangerous
stresses on the wheel.
When grinding with a new wheel be certain
to grind while pulling tool backwards until
wheel becomes rounded on its edge. New
wheels have sharp corners which tend to
“bite” or cut into workpiece when pushing
forward.
!
WARNING
Wire Brush Operations
Wire brushes are intended to “clean”
structural steel, castings, sheet metal, stone
and concrete. They are used to remove rust,
scale and paint.
Avoid bouncing and snag-
ging the wire brush, espe-
cially when working corners, sharp edges
etc. This can cause loss of control and
kickback.
!
WARNING
BM 1609929A20 3/03 3/12/03 10:35 AM Page 10