of Grinding Wheel Breakage
is a list of some of the causes of grinding
damaged during transportation. Inspect all
grinding wheels before using them.
speed higher than recommended RPMs. Consult
of knowledge and training. If you do not know
how to use a grinding wheel, get help from
someone who does.
on the wrong surface of a grinding wheel.
carelessness. Any grinding wheel can be broken
if not used properly.
mounting of grinding wheel. See ANSI B7.1.
forcing of the wheel into your work piece.
Chicago Abrasives Wheel supplies a Safety Guide
with each box of mounted wheels. Operating mounted
wheels higher than the maximum safe operating
speed may result in failure of the mandrel.
Every mandrel - mounted wheel - overhang combination
has a certain speed at which vibration due to
deflection or whip becomes excessive. This speed
varies with the dimensions of the wheel, diameter
of the mandrel and the overhand, which is distance
between the mounted wheel and the power tool
chuck or collet.(see illustration)
maximum speed is not measurably affected by
the type or style of machine used. However,
the condition of the machine spindle, bearings
and chuck will affect the safe maximum speed.
Also important are care in mounting the wheel
as well as run-out and unbalance of the wheel.
A Mounted Points
B Mounted Points
W Mounted Points
Maximum operating speed tables for A, B and
W shapes are published in ANSI B7.1 Safety Guide
for the Use, Care and Protection of Abrasive
Wheels. Copies of ANSI B7.1 may be ordered from
the Unified Abrasive
Manufacturers’ Association, 30200
Detroit Road, Cleveland, Ohio 44145-1967.