Operation; Correct Drilling Speeds - Delta 70-200 Instruction Manual

REMOVING CHUCK
AND SPINDLE ADAPTER
If you desire to remove the chuck and spindle adapter,
lower spindle and rotate chuck until the slot in the
spindle lines up with the slot in the quill, as shown in
Fig. 31. Then insert tapered end of drift bar (A) into slot
(B) in quill and remove chuck and spindle adapter.
Your Drill Press should be used with drill bits 5/8
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.
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. 32. This prevents the workpiece from rotating with the drill bit or cut-
ting 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.
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 metals.
WARNING: Use the recommended speed for the drill press bit and workpiece material. As a guideline
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.

OPERATION

CORRECT DRILLING SPEEDS

²
or less in diameter.
Fig. 32
13
B
A
Fig. 31