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DRILLING WOOD
In addition to the instructions listed under "GENERAL DRlLLlNG", the following
also apply:
1.
When using twist drills in wood, withdraw them from the hole frequently to
clear chips built up in flutes to avoid overheating and burning the work.
2.
If you use a backing block to keep the back of work from splintering, clamp it
securely in place. If you use a spade bit or hole saw without a backing block
ease the pressure as soon as the bit point breaks through the workpiece, 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.
2.
Start drilling with the slow speed and gradually increase the speed as the drill
cuts. The harder the material, the slower the speed required.
3.
When drilling a large hole, first drill a smaller hole and then enlarge it to the
required size.
4.
The use of a lubricant 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 the following chart.
SUGGESTED HOLE SIZES FOR WOOD
SCREWS
Shank Drill
Screw
Clearance
Size
Diameter
#6
9/64 (.140)
#8
11/64 (.172)
#10
3/16 (.187)
#12
7/32 (.218)
2.
Install a proper bit that fits the screw.
3.
Set the torque-adjusting collar and set the speed selector to LOW.
4.
Set the screwdriver for the correct rotation.
5.
Start the screw in the hole with your
fingers.
6.
Place the bit on the screw, start the
screwdriver, and exert pressure .
7.
As soon as the screw is seated,
remove the screwdriver.
8.
Use a lubricant (soap or wax) on the
screw threads for ease of driving.
This is particularly important in hard
wood.
9.
Combination pilot drill, shank drill,
and counter-sink bits are available
from local supply houses for drilling holes in one easy operation.
Pilot Drill Diameter
Soft Wood
Hard Wood
1/16 (.062)
7/64 (.109)
5/64 (.078)
1/8 (.125)
3/32 (.094)
9/64 (.140)
7/64 (.109)
5/32 (.156)
14
Shank Drill
Pilot Drill
IT'S A SCREWDRIVER
Fig. 8
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