Porter-Cable 7564 Instruction Manual page 11

GENERAL DRILLING
1. Be sure drill bit is securely gripped in chuck. (See INSTALLING AND
REMOVING DRILL BIT).
2. Make sure work is held securely in vise or clamped in place prior to
starting drilling operation.
3. Locate exact center for hole to be drilled and using a center punch,
make a small dent in work.
4. Place tip of drill bit in dent made by center punch, hold drill square with
work, and start the motor.
Apply steady, even pressure to keep drill bit cutting. Too little pressure will
keep the bit from cutting and dull the edges due to excessive friction created
by sliding over the surface.
overheat resulting in bodily injury or damaged drill bits.
action of the drill, should the bit jam in the work.
5. If drill stalls or becomes jammed in the hole, release trigger immediately,
remove drill bit from work and determine cause of stalling or jamming. DO
NOT SQUEEZE TRIGGER ON AND OFF IN AN ATTEMPT TO FREE A
STALLED OR JAMMED DRILL – THIS WILL DAMAGE THE MOTOR. The
direction of rotation may be reversed to help free a jammed bit.
6. Reduce the pressure on the drill just before the bit cuts through the work
to avoid splintering wood or stalling in metal.
7. When bit has completely penetrated work and is spinning freely,
withdraw it from the work while the motor is still running, then turn off drill.
DRILLING WOOD
In addition to the instructions listed under GENERAL DRlLLlNG, the following
also apply:
1. When using twist drills in wood, they should be withdrawn from the hole
frequently to clear chips built up in flutes to avoid overheating and burning
work.
2. If a backing block is used to keep back of work from splintering, it
should be clamped securely in place. If a backing block is not used with
spade bits or auger bits, ease up pressure as soon as bit point breaks
through work, and complete the hole from the opposite side.
DRILLING METAL
In addition to the instructions listed under GENERAL DRILLING, the following
also apply:
than when drilling other materials.
1. Use only good quality sharp high speed steel twist bits when drilling
metal.
2. Start drilling with slow speed and gradually increase speed as drill cuts.
The harder the material, the slower the speed required. The softer the
material, the faster the speed.
Loose work may spin and cause bodily injury.
Too much pressure may cause the bit to break or
BE ALERT and brace yourself against the twisting
When drilling metal, jamming of bit is more likely
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