Delta 14-070 Instruction Manual download pdf (Page 17)

OPERATION

Your drill press is to be used with drill bits of 5/8" or less in

diameter. The following directions will give the inexperi-

enced operator a start on common drill press operations.

Use scrap material for practice to get a feel of the machine

before attempting regular work.

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. 26. This prevents the workpiece

from rotating with the drill bit or cutting tool, causing dam-

age to the workpiece or personal injury to the operator. If it

is not possible to support the workpiece against the col-

umn, the workpiece should always be fastened to thetable

using clamps or a vise.

CORRECT DRILLING SPEEDS

Factors which determine the best speed to use in any drill press operations are: kind of material

being worked, size of hole, type of drill or other cutter, and quality of cut desired. The smaller the

drill, the greater the required RPM. In soft materials, the speed should be higher than for hard met-

als.

WARNING: Use the recommended speed for the drill press bit and workpiece material. As a guide-

line for the speed to use for different drill diameters and materials, refer to the chart located on the

inside top cover of the drill press for your convenience.

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 square 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.

DRILLING IN METAL

Use clamps to hold the work when drilling in metal. The work should never be held in the bare

hand; the lips of the drill may seize the work at any time, especially when breaking through the

stock. If the piece is whirled out of the operator’s hand, he may be injured. In any case, the drill will

be broken when the work strikes the column.

The work must be clamped firmly while drilling; any tilting, twisting or shifting results not only in a

rough hole, but also increases drill breakage. For flat work, lay the piece on a wooden base and

clamp it firmly down against the table to prevent it from turning. If the piece is of irregular shape

and cannot be laid flat on the table, it should be securely blocked and clamped.

Fig. 26

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Delta 14-070 Instruction Manual Page 17

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