Delta 11-990 Instruction Manual download pdf (Page 14)

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.

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.

Fig. 35

BORING IN WOOD

Twist drills, although intended for metal drilling, may also be used for boring holes in wood. However, machine spur bits

are generally preferred for working in wood; they cut a flat bottom hole and are designed for removal of wood chips.

Do not use hand bits which have a screw tip; at drill press speeds they turn into the wood so rapidly as to lift the work

off the table and whirl it.

For through boring, line up the table so that the bit will enter the center hole to avoid damage. Scribe a vertical line on

the front of the column and a matchmark on the table bracket, so that the table can be clamped in the center position

at any height.

Feed slowly when the bit is about to cut through the wood to prevent splintering the bottom face. Use a scrap piece

of wood for a base block under the work; this helps to reduce splintering and protects the point of the bit.

FASTENING DRILL PRESS

TO SUPPORTING SURFACE

If during operation there is any tendency for the drill

press to tip over, slide or walk on the supporting surface,

the drill press base must be secured to the supporting

surface with 125mm (5") long carriage screws, flat

washers, lock washers, and hex nuts through the two

holes (A) Fig. 36, located in the drill press base.

Fig. 36

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Delta 11-990 Instruction Manual Page 14

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