Correct Drilling Speeds - Delta 20-950 Instruction Manual

MACHINE USE
NOTE: Use only drill bits, cutting tools, sanding drums, or other accessories with shank diameters of 5/8" (16 mm)or
less.
NOTE: After installing a drill bit, use the supplied key to tighten all three locations on the chuck.
The use of accessories and attachments not recommended by Delta may result in risk of injury.
IMPORTANT: When the workpiece (A) Fig. 44 is long
enough, position it on the table with one end against the
left side of the column (B) to prevent the workpiece from
rotating. If it is not possible to support the workpiece
against the column, clamp the workpiece to the table.
INSTALLINg AND REMOVINg DRILL BITS
NOTE: Use only drill bits, cutting tools, sanding drums,
or other accessories with shank diameters of 5/8" (16
mm) or less.
To reduce the risk of injury, turn unit off
and disconnect it from power source before installing
and removing accessories, before adjusting or when
making repairs. An accidental start-up can cause injury.
1. Insert the smooth end of drill bit (A) Fig. 45 in the
chuck (B) as far as it will go, and then back the
bit out 1/16" (1.6 mm) (or up to the flutes for small
bits).
2. Center the drill bit (A) Fig. 45 in the chuck (B) before
tightening the chuck with the key (C).
3. Turn the chuck key (C) Fig. 45 clockwise to tighten
and counter-clockwise to loosen the chuck jaws.
4. Tighten all three chuck jaws to secure the drill bit
sufficiently to prevent slipping.
5. Remove the chuck key (C) Fig. 45 from the chuck
before starting the drill press. The chuck key (C) is
equipped with a self-ejecting pin (D) which helps
minimize the potential for the key to be left in the
chuck.

CORRECT DRILLINg SPEEDS

Factors that determine the correct speed are 1) the workpiece, 2) the size of the hole, 3) the type of bit or other cutter,
and 4) the quality of cut.
Use the recommended speed for the the drill press bit and workpiece.
Fig. 44
B
A
Fig. 45
16
B
A
D
C