Porter-Cable 877 - Manual (Page 12)

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2. Install proper bit that fits screw to screwdriver.
3. Set torque adjusting collar for desired torque and set speed selector to LOW.
4. Set screwdriver for correct rotation.
5. Start screw straight in hole with fingers.
6. Place bit on screw, start screwdriver and exert pressure to drive screw.
7. As soon as screw has seated, lift screwdriver from screw.
8. A lubricant, such as soap or wax, may be used on screw threads for ease
of driving. This is particularly important in hard wood.
9. Combination pilot drill, shank drill and countersink bits are available from
local supply houses for drilling holes in one easy operation.
DRIVING SELF-TAPPING SCREWS
1. Drill pilot hole of correct size as recommended by screw manufacturer for
fastener being used.
2. Install proper bit that fits screw to screwdriver.
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, lift screwdriver from screw.
DRIVING MACHINE SCREWS
1. Drill and tap correct hole size for fastener to be used.
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 to screwdriver.
3. Set screwdriver for reverse rotation.
4. Place bit in screw and start drill to remove screw.
HAMMER-DRILLING
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. 3. Start drill by squeezing the trigger. Place tip of bit in contact
with work and apply steady firm pressure.
Avoid allowing Hammer-Drill to bounce or “dance” under its own weight. This
could result in damage to both the drill bit and the Hammer-Drill.
900470 - 11-30-00.QXD 9/25/02 11:10 AM Page 12