Delta 11-990C Adjusting Spindle Return Spring, Operation, Installing and Removing Drill Bits

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 decrease 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.

OPERATION

The following directions will give the inexperienced operator a start on common drill press operations. Use scrap material for practice to get a feel of the machine before attempting regular work.

WARNING: The use of accessories and attach- ments not recommended by Delta may result in risk of injury.

IMPORTANT: When the workpiece is long enough it should always be positioned on the table with one end against the column, as shown in Fig. 34. This prevents the workpiece from rotating with the drill bit or cutting tool, causing damage to the workpiece or personal injury to the operator. If it is not possible to support the workpiece against the column, the workpiece should always be fastened to the table using clamps or a vise.

A

B

C

Fig. 32

D

B

A

Fig. 33

Fig. 34

INSTALLING AND REMOVING DRILL BITS

1.Insert smooth end of drill bit (A) Fig. 35, as far as it will go into the chuck (B), and then back the bit out 1/16", or up to the flutes for small bits.

2.Make certain that the drill bit (A) Fig. 35, is centered in the chuck (B) before tightening the chuck with the key

(C).

3.Turn the chuck key (C) Fig. 35, clockwise to tighten and counterclockwise to loosen the chuck jaws.

4.Tighten all three chuck jaws to secure the drill bit sufficiently so that it does not slip while drilling.

5.MAKE SURE chuck key (C) Fig. 35, is removed from chuck before starting drill press. Your chuck key (C) is equipped with a self-ejecting pin (D) which eliminates the hazard of the key being left in the chuck.

D

B

C

A

Fig. 35

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