- Pedestal
Grinders should be securely attached to the floor and Bench Grinders
should be securely fastened to a bench in order to handle grinding
operations.
- Always check
that a Grinding Wheel R.P.M Rating is consistent with speed of
the Grinding Machine.
- Always wear
eye protection (safety glasses or face shield)
- Never remove
guards from a Bench/Pedestal Grinder. They offer protection in
case of wheel failure and protects hands and fingers from injury.
- Work rests
or tools rests are provided on all machines. The work on a bench
grinder should be securely fixed and close enough to the grinding
wheel to prevent the job from slipping off. It should be adjusted
as the disc becomes smaller through wear and dressing. Never adjust
tool rests while the grinder is running.
- Before commencing
grinding, allow the grinding wheel to run at operating speed for
at one minute. Do not stand directly in front of a Grinding Wheel
when it is first started. Do not use a wheel that vibrates.
- When commencing
a grinding operation, bring the object into contact with the grinding
wheel slowly and smoothly avoiding impact or bumping motions.
- Move the
object being ground, back and forth across the face of the wheel,
as this prevents "ruts" or grooves from forming.
- Occasionally
a new wheel is cracked or flawed and is likely to shatter as soon
as it is used. New wheels should be visually checked and given
a test before being fixed to the spindle. Tap the side of the
wheel with a light tool. It should have a clear ring. A dull noise
indicates a flaw.
- Ensure that
the hole in the grinding wheel fits closely on the spindle.
- When a wheel
has been newly fitted between appropriate washers & flanges,
rotate it by hand to check tha balance before switching on the
power to use the machine.
- Unless flanges
and washers are evenly seated on either side of the wheel before
the locking nut is tightened, the wheel can crack and shatter.
Avoid over-tightening the locking nut, as this can exert hazardous
forces on the wheels.
- Unless the
wheel is "dressed" with a diamond dresser, when pores
become blocked or it loses its cutting effect, exerting forces
that may cause the wheel to shatter.
Wheel Dressing
Procedure :
- Use a dressing
tool approved for the job.
- Inspect star
dressers for loose shaft and worn discs.
- Round off
the wheels with a hand stone before and after dressing to prevent
the edges from clipping.
- Use the work
rest to support and guide the tool.
- Apply moderate
pressure slowly and evenly.
- Always apply
diamond dressers at the center or slightly below the center, never
above.
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