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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.
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.
3. When drilling a large hole, it is easier to first drill a smaller hole and then
enlarge it to the required size.
4. The use of a lubricant, such as oil, on the drill point helps keep the bit
cool, increases drilling action and prolongs drill bit life.
DRIVING WOOD SCREWS
1. Drill pilot and shank clearance holes. See following chart.
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.
IT’S A
SCREWDRIVER
Fig. 8
Shank
Drill
SUGGESTED HOLE SIZES
FOR WOOD SCREWS
Shank Drill
Pilot Drill Diameter
Screw Clearance Soft Hard
Size Diameter Wood Wood
#6
9
/
64 (.140)
1
/
16 (.062)
7
/
64 (.109)
#8
11
/
64 (.172)
5
/
64 (.078)
1
/
8 (.125)
#10
3
/16 (.187)
3
/32 (.094)
9
/64 (.140)
#12
7
/
32 (.218)
7
/
64 (.109)
5
/
32 (.156)
Pilot
Drill
900469 - 11-30-00.QXD 9/25/02 11:26 AM Page 11