General International 15-870 M1 Operating And Maintenance Instructions Manual page 5

REPLACING GRINDING WHEELS
Follow these procedures to remove and replace the grinding
wheels.
1. Unplug the grinder from the power source.
2. Raise the eye shield out of the way.
3. Loosen and pull the tool rest out as far as possible. Do not
remove completely.
4. Remove the five screws from the side of the wheel cover, and
remove the wheel cover.
5. Insert a flat bladed screwdriver into the left-hand slot of the
grinding motor shaft. Hold the screwdriver firmly in order to
keep the shaft from turning as you loosen and remove the
hex nut in the center of the grinding wheel or other accessory.
NOTE: If you are changing only the right side accessory, you do not need to remove the left wheel cover. An
opening in the center of the cover permits the screwdriver to enter into the slotted shaft.
NOTE: The nut on the right side of the grinder has a standard right hand thread, turn counter-clockwise to loosen.
The left-hand nut has a left-hand thread, turn clockwise to loosen.
To release the nut in the center of the grinding wheel, it may be necessary to strike the wrench sharply in the
loosening direction with the heel of your hand.
6. Remove the wheel washer and wheel.
7. Inspect the wheel for any cracks, chips, or any other damage other than normal wear. If damage is found do
not re-install or re-use the damaged wheel. Discard and replace a damaged wheel immediately. Verify the
blotters, if blotters are damaged replace with thin cardboard or blotter paper of the same shape.
Note: Never grind without blotters on each side of the wheel.
8. Install the new wheel, verify that both wheel washers are positioned correctly (Fig.6).
9. Hold wheel and tighten the nut firmly, do not over-tighten.
10. Re-install the wheel cover and the five screws.
11. Adjust the eye shields and tighten securely.
12. Re-adjust and tighten securely your tool rest to within 1/8" from the grinding wheel or other accessory.
OPERATION INSTRUCTIONS
1. In order to prevent movement of the grinder when pressure is applied against the wheel, mounting the grinder
on a flat stable surface such as a workbench is strongly recommended. If a bench is not available; Install and
bolt your bench grinder to a similar solid and stable work bench or stand .
2. Note the following features: The wheel on the left is a 60 grit (for model 15-870) or 46 grit (for model 15-910)
designed for medium material removal and general grinding.
3. The wheel on the right is a 36 grit (for model 15-870) or 24 grit (for model 15-910) designed for first or initial
material removal.
4. To operate the bench grinder, first put on safety glasses, then switch the "On" button. Allow the bench grinder to
achieve its full speed (1,720 RPM) before pressing a work piece against the grinding wheel.
5. Hold your work piece firmly against the tool rest, small work pieces must be held with pliers or other suitable
clamps.
6. Feed the work smoothly and evenly into the grinding wheel. Move the work piece slowly and try to avoid jam-
ming the work piece against the wheel. As the wheel tends to slow down you should occasionally release the
pressure to let the wheel return to full speed.
7. Grinding can only be done on the face of the grinding wheel, grinding should never be done on the side of
the grinding wheel unless you are equipped with a special wheel specifically made to side grind.
Fig. 6
5