MAinTEnAncE & TrOUbLEShOOTing
changing grinding wheels
WArning:
To avoid injury from accidental starting, always turn the switch off,
and unplug the machine from the power source before changing grinding wheels.
NOTE: Inspect new grinding wheels for cracks or other visible signs of damage.
Discard the grinding wheel immediately if any damage is found.
1. Remove the corresponding grinding wheel cover (A) Fig.10 by removing the
long screws (B). Removing the tool rest (C) will be necessary, reposition the
spark shield away from the grinding wheel.
2. Use a piece of wood to wedge the grinding wheel (A) Fig.11 against the grinding
wheel guard (B) to prevent the shaft (C) from rotating. Remove the arbor hex.
nut (D) using a 24 mm wrench.
nOTE:
The arbor hex. nut (D) Fig.11 on the left side of the bench grinder is left
hand threaded (rotate clockwise to loosen). The arbor hex. nut on the right side
of the bench grinder is right hand threaded (rotate counterclockwise to loosen).
3. Remove the outer flange (E) and slide off the old grinding wheel (A).
4. Make sure the inner flange is in position, then install the new grinding wheel.
Secure it with the outer flange (E) and arbor hex. nut (D).
nOTE:
Do not overtighten to avoid cracking the new grinding wheel. NEVER in-
stall a grinding wheel on the arbor without paper or fiber discs between the grind-
ing wheel and flanges. Not using the discs can put stress on the grinding wheel,
causing it to crack and possibly fall apart.
5. Reinstall the grinding wheel cover (A) Fig.10, and reposition the tool rest and
spark shield assemblies.
Problem
Motor will not start.
Motor overheats.
Wavy condition on surface
of workpiece.
Lines on surface of workpiece.
Burning spots or cracks in
the workpiece.
Probable cause
1. Low voltage.
2. Open circuit in motor or loose connections.
1. Motor overloaded.
1. Machine vibrating.
2. Workpiece not being held firmly.
3. Wheel face uneven.
4. Wheel is too hard.
1. Impurity on wheel surface.
2. Workpiece not being held tightly.
1. Improper type of grinding wheel.
2. Improper feed rate.
Probable solution
1. Check power line for proper voltage.
2. Inspect all lead connections on motor for
loose or open connections.
1. Reduce load on motor.
1. Make sure machine is securely mounted on a
solid surface.
2. Use a holding device to firmly retain the
workpiece.
3. Dress the grinding wheel.
4. Use softer wheel, or reduce the feed rate.
1. Dress the grinding wheel.
2. Use a holding device to firmly retain the
workpiece.
1. Try a wheel which is softer style or a coarser
grit.
2. Slow down the rate of movement of the
workpiece into wheel.
FigUrE 10
FigUrE 11
