Delta GR450 Manual De Instrucciones página 11

GRINdING WHEELS
The use of accessories and attachments not recommended by delta may result in a risk of
injury.
Grinding wheels used with this grinder should be rated for 3600 RPM or higher, 8" in diameter with a 5/8" arbor hole,
and 1" wide.
Using wheels less than 1" wide will cause vibration and could damage the machine.
Two aluminum oxide grinding wheels (36 grit and 60 grit) are supplied with your grinder. For best results, and to
maintain balance, keep the wheels properly dressed. Do not force the work against a cold wheel. The grinding wheel
should always be run for one full minute before applying a workpiece. Use only balanced wheels with your grinder.
Using balanced wheels adds years to the life of the bearings on the grinder. By eliminating the most common source
of vibration, your grinding projects will be more accurate.
ALWAYS maintain a distance of 1/8" or less between the grinding wheel and the tool rest. Adjust
the tool rests and spark guards as the grinding wheels decrease in size with use.
dRESSING A GRINdING WHEEL
Use a suitable silicone carbide stick type dresser or the
wheel dresser provided with the grinder (Fig. 11). Bring
the dresser forward on the tool rest until it just touches
the high point on the face of the wheel. Dress the wheel
by moving the dresser back and forth. Repeat this
operation until the face of the grinding wheel is clean and
the edges are square.
CHANGING GRINdING WHEELS
disconnect the machine from the power source.
1. Loosen the knobs (A) Fig. 12 and remove.
2. Rotate the wheel covers (B) Fig. 12 toward the rear, and remove the wheel covers.
3. Pull the two arbor nut wings (A) Fig. 13 out.
4. To loosen, place the included wrench (B) Fig. 13B on the flats of the motor shaft and brace it on the tool rest to
keep the shaft from turning while removing the arbor nut (A) Fig. 13. To loosen either arbor nut, turn it toward the
front of the grinder.
NOTE: If necessary, insert a flat screwdriver (A) Fig. 13B through the opening in the arbor nut and use it to provide
more torque to loosen the nut.
5. Remove the arbor nut, wheel flange, and old grinding wheel.
6. Place the new grinding wheel on the arbor.
NOTE: Grinding wheel must be 1" wide.
7. Place the flange on the arbor and thread the arbor nut on the arbor until the arbor nut makes contact with the
arbor flange. Push the arbor nut wings (A) Fig. 13 out to the closed position. The wings must lay flat against the
arbor flange (Fig. 14) and not left in the open position (Fig. 15).
The arbor nut wings must be flat against the arbor flange to prevent vibration.
8. Replace the wheel covers that were removed in STEPS 1 and 2.
9. Adjust the spark guards and tool rests before operating the machine.
11
Fig. 11