Delta SHOPMASTER GR250 Instruction Manual download pdf (Page 9)

VARIABLE SPEED

CONTROL

The grinder is equipped with a variable speed control (B)

Fig. 10. When the variable speed control knob is

positioned to the furthermost left position (counter

clockwise), the RPM is 2000. The rotation increases as

the knob is turned clockwise. When the variable speed

control knob is positioned to the furthermost right

position (clockwise), the RPM is 3450.

FLEXIBLE LAMP

The flexible lamp operates independently of the grinder.

To turn the lamp on and off, rotate switch (A) Fig. 11.

WARNING: To reduce the risk of fire, use 40 watt or

less, 120 volt, reflector track type light bulb (not

supplied). A standard household light bulb should not be

used. The reflector track type light bulb should not

extend below the lamp shade.

Fig. 11

DRESSING A

GRINDING WHEEL

When dressing a grinding wheel, use a suitable silicone

carbide stick type dresser or the wheel dresser provided

with the grinder, as shown in Fig. 12. Bring the dresser

forward on the tool rest until it just touches the high point

on the face of the wheel and dress the wheel by moving

the dresser back and forth. Repeat this operation until

the face of the grinding wheel is clean and the corners of

the wheels are square.

GRINDING WHEELS

WARNING: THE USE OF ACCESSORIES AND

ATTACHMENTS NOT RECOMMENDED BY DELTA

MAY RESULT IN RISK OF INJURIES. Attachments

used with this grinder should be rated for 3600 RPM or

higher and be 6" in diameter with a 1/2" arbor hole.

Two aluminum oxide grinding wheels are supplied with

your grinder; one 36 grit and one 60 grit. For best

grinding results, and to maintain good balance, always

keep the wheels properly dressed. Do not force the work

against a cold wheel. The grinding wheel should always

be run at idle speed for one full minute before applying

work. It is recommended that only balanced wheels be

used with your grinder. The use of balanced wheels

adds years to the life of the bearings on the grinder and

by eliminating the most common source of vibration,

more accurate work is accomplished. 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.

Fig. 12

1 2 3 4 5 6 7 8 9 10 11 12

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Delta SHOPMASTER GR250 Instruction Manual Page 9

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