Delta 11-990 Instruction Manual download pdf (Page 13)

Fig. 30

5. After the belt is positioned on the desired steps of

the motor and spindle pulleys, pivot motor away from the

drill press head until the belt is properly tensioned and

tighten tension lock knob (B) Fig. 30. The belt should be

just tight enough to prevent slipping. Excessive tension

will reduce the life of the belt, pulleys and bearings.

Correct tension is obtained when the belt (C) can be

flexed about one inch out of the line midway between the

pulleys using light finger pressure.

DRILLING HOLES TO DEPTH

Where a number of holes are to be drilled to exactly the

same depth, a depth stop is provided in the pinion shaft

housing and is used as follows:

1. Loosen lock screw (A) Fig. 31, and rotate housing (B)

until the pointer (C) lines up with the desired depth

indicated on scale (D). Then tighten lock screw (A).

2. All holes will then be drilled to the exact depth as

indicated on scale (D) Fig. 31. NOTE: Scale (D) is

calibrated in both inches and millimeters.

Fig. 31

ADJUSTING SPINDLE

RETURN SPRING

The spindle is automatically returned to its upper most

position upon release of the handle. It is recommended

that the handle be allowed to slowly return to the top

position after all holes have been bored in the material.

This spring has been properly adjusted at the factory

and should not be disturbed unless absolutely

necessary. To adjust the return spring, proceed as

follows:

1. Disconnect the tool from the power source.

2. Loosen the two nuts (B) Fig. 32, approximately 1/4".

Do not remove nuts (B) from shaft (C).

3. While firmly holding spring housing (A) Fig. 33, pull

out housing and rotate it until the boss (D) is engaged

with the next notch on the housing. Turn the housing

counterclockwise to increase and clockwise to de-

crease spring tension. Then tighten the two nuts (B) to

hold the housing in place. IMPORTANT: Inside nut (B)

should not contact spring housing (A) when tight.

Fig. 32

Fig. 33

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Delta 11-990 Instruction Manual Page 13

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