Porter-Cable 987 - Manual (Page 12)

1. Set torque adjusting collar for drilling operation and set speed selector to
appropriate speed.
2. Be sure drill bit is securely gripped in chuck.
3. Set REVERSING BUTTON for clockwise rotation.
Make sure work is held securely in vise or clamped in place
prior to starting drilling operation. Loose work may spin and
cause bodily injury.
4. Locate exact center for hole to be drilled and using a center punch, make
a small dent in work.
5. Place tip of drill bit in dent made by center punch, hold drill square with
work, and start the motor.
Applying too much pressure may cause the bit to overheat or
break resulting in bodily injury or damaged drill bits. Apply
steady, even pressure to keep drill bit cutting. Too little
pressure will keep the bit from cutting and dull the cutting
edges due to excessive friction created by sliding over the
surface.
Always be alert and brace yourself against the twisting action
of the drill.
6. 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. Be sure
direction of rotation is RESET before attempting to continue drilling.
7. Reduce the pressure on the drill just before the bit cuts through the work
to avoid splintering wood or stalling in metal.
8. 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, withdraw drills from the hole frequently to
clear chips built up in flutes to avoid overheating and burning work.
2. When using a backing block to keep back of work from splintering, clamp
it securely in place. If a backing block is not used with spade bits or hole
saws, 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 DRlLLlNG”, the
following also apply:
1. Use only good quality, sharp, high speed steel twist bits when drilling
metal.
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GENERAL DRILLING
984-987 - manual - 905273- 04-08-03.qxd 4/8/03 9:41 AM Page 12