Delta DP350 Instruction Manual download pdf (Page 13)

INSTALLING AND REMOVING DRILL BITS

1. Insert the smooth end of the drill bit (A) Fig. 29 in the chuck (B) as far as it will go. Back the bit out 1/16", or up to

the flutes for small bits.

2. Center the drill bit (A) Fig. 29 in the chuck (B) before tightening the chuck with the key (C).

3. Turn the chuck key (C) Fig. 29 clockwise to tighten and counter-clockwise to loosen the chuck jaws.

4. Tighten all three chuck jaws to prevent bit slippage.

Remove the chuck key (C) Fig. 29 from the chuck before starting the drill press.

NOTE: Your chuck key (C) is equipped with a self-ejecting pin (D) to help minimize the hazard of the key being left in

the chuck.

IMPORTANT: When the workpiece is long enough position it on the table with one end against the left side of the

column (Fig. 28). This prevents damage to the workpiece or personal injury caused by the workpiece rotating with the

drill bit or cutting tool. If the workpiece cannot be supported against the column, fasten it to the table with clamps or a

vise.

Use drill bits with a shank of 1/2" or less in diameter with this drill press. The following information 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.

The use of accessories and attachments not recommended by Delta may result in risk of injury.

MACHINE USE

Disconnect the machine from the power source!

Fig. 28

Fig. 29

CORRECT DRILLING SPEEDS

Factors which determine the best speed to use are: kind of material being worked, size of hole, type of drill or other

cutter, and quality of cut desired.

Use the recommended speed for the drill press bit and workpiece material.

You can use twist drills, although intended for metal drilling, for boring holes in wood. 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 that have a screw tip. At drill press speeds, they can lift the workpiece off of the table and spin it.

For through boring, align the table so that the bit will enter the center hole. Scribe a vertical line on the front of the

column and a matching mark on the table bracket and the drill press head, so that you can clamp the table and drill

press head in the center position from 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 as a base block under the work to help reduce splintering and to protect the point of the bit.

DRILLING IN METAL

Use clamps to hold the workpiece. Never hold the workpiece in your hand. The drill bit can seize the work at any

time, especially when breaking through the workpiece. The workpiece could spin and pull out of your hand, causing

personal injury and/or damage to the bit.

Clamp the workpiece firmly. Tilting, twisting or shifting results not only in a rough hole, but also increases drill bit

breakage. For flat work, place the workpiece on a wooden base and clamp it firmly down against the table. If the

workpiece has an irregular shape and cannot be placed flat on the table, securely block and clamp it.

DRILLLING IN WOOD

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Delta DP350 Instruction Manual Page 13