Drilling Concrete - Porter-Cable 8923 Instruction Manual

984-987 - manual - 905273- 04-08-03.qxd
DRIVING SELF-TAPPING SCREWS
1. Drill pilot hole of correct size as recommended by screw manufacturer.
2. Install proper bit that fits screw.
3. Set torque adjusting collar for desired torque and set speed selector to
LOW.
4. Set screwdriver for correct rotation.
5. Position bit in head of screw.
6. Place end of screw into pre-drilled hole, remove fingers, start
screwdriver, and drive screw.
7. As soon as screw has seated, stop drill, and lift screwdriver from screw.
DRIVING MACHINE SCREWS
1. Drill and tap correct hole size for fastener.
2. Start screw in hole with fingers and drive as outlined under "DRIVING
WOOD SCREWS".
TO REMOVE SCREWS
1. Set torque adjusting collar for maximum torque and set speed selector to
LOW.
2. Install proper bit that fits screw.
3. Set screwdriver for counter-clockwise rotation.
4. Place bit in screw and start drill to remove screw.

DRILLING CONCRETE

Use carbide-tipped masonry bits only. Be sure drill is securely gripped in
chuck and the mode selecting ring is in the "hammer" position, Fig. 5B. Start
drill by squeezing the trigger. Place tip of bit in contact with work and apply
steady firm pressure.
Avoid allowing the tool to bounce or "dance" under its own weight. This could
result in damage to both the drill bit and the tool.
Take extreme care to stop the drill immediately in the
event that the bit should become jammed in the hole.
See "ADDITIONAL SAFETY RULES FOR HAMMER
DRILL/DRIVER", Number 7.
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