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7.0 Operation
A bench grinder is designed for hand-grinding
operations such as sharpening chisels,
screwdrivers, drill bits, removing excess metal,
and smoothing metal surfaces.
A
Medium Grain Abrasive Grinding Wheel
is
suitable for rough grinding where a considerable
amount of metal must be removed or when
obtaining a smooth finish is not important.
A
Fine Grain Abrasive Grinding Wheel
should be
used for sharpening tools to close size tolerances
because it removes metal more gradually for
precision grinding and gives work a smooth finish.
Do not operate this grinder
without all guards and shields in place and in
working order. Always use approved safety
glasses or face shields. Failure to comply may
cause serious injury.
7.1 Switch
The toggle switch guard will accept a padlock, as
shown in Figure 9. To safeguard the grinder from
unauthorized operation and accidental starting by
young children, use of a padlock (not provided) is
highly recommended. Place the key in a location
inaccessible to children and others not qualified
to use the tool.
Figure 9 – Switch Lockout (Padlock not
Provided)
7.2 Precautions
Before starting the grinder, turn the wheels by
hand to verify they are clear of obstructions and
will turn freely. Tool rests and spark guards
should not touch the wheel.
Adjust spark arrestor, eye shield, and tool rest
into proper positions. Stand to one side of the
wheel paths, and turn on the grinder. Allow it to
reach full running speed before beginning
operation.
Keep a steady, moderate pressure on the
workpiece and keep it moving at an even pace for
smooth grinding. Pressing too hard overheats the
motor and prematurely wears down the grinding
wheels. Note the original bevel angle on the item
to be sharpened and try to maintain the same
shape. The tilt scale on the tool rest will aid in
establishing this angle. The grinding wheel
should rotate into the object being sharpened.
Keep a tray filled with water and dip your work
into it regularly to prevent overheating.
Overheating can weaken metals.
Do not use the side of the grinding wheel; this
puts dangerous stress on the wheel.
When the wheel becomes loaded or dull, use an
approved grinding wheel dresser and dress the
wheel face.
Keep tool rest and spark guard to within 1/16" of
the grinding wheel. See
Adjustment
section to
adjust.
8.0 Maintenance
Always disconnect power to
the machine before performing maintenance.
Failure to do this may result in personal
injury.
For safety, turn the switch to OFF and remove
plug from the power source outlet before
adjusting or servicing the bench grinder. If the
power cord is worn, cut or damaged in any way,
have it replaced immediately.
8.1 Care of Grinding Wheels
In normal use, grinding wheels may become
cracked, grooved, rounded at the edges, chipped,
out of true or loaded with foreign material.
Cracked
wheels
should
be
replaced
immediately
. While any of the other conditions
can be remedied with a dressing tool (available at
most hardware stores), new wheels sometimes
require dressing to make them round.
8.2 Changing Wheels
If you must replace a wheel be sure to obtain one
with a safe rated speed at least as high as the
NO
LOAD RPM
marked on the grinder's nameplate.
Table 2 shows correct dimensions for the
replacement wheel.
