Delta 8" VARIABLE SPEED GRINDER GR450 User Manual download pdf (Page 11)

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).

CHANGING GRINDING WHEELS

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.

The arbor nut wings must be flat against the arbor flange to prevent vibration.

Disconnect the machine from the power source.

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.

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.

Fig. 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.

DRESSING A GRINDING WHEEL

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Delta 8" VARIABLE SPEED GRINDER GR450 User Manual Page 11