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19.
Operation (continued)
Depth scale method (Fig. 30)
1. With the switch (1) OFF, turn the feed handle (2) until
the drill bit tip (3) slightly touches the top of the
workpiece (4).
2. Hold the feed handles in that position.
3. Loosen the depth lock knob (5).
4. Spin the depth scale hub (6) until the desired drilling
depth is at the scale pointer.
5. Lock the depth lock knob. The chuck and drill bit will
now drill into the workpiece only to the distance
selected on the depth scale.
FIG. 30
4
1
3
6
2
5
General Drilling Guidelines
To reduce the risk of injury, make
sure the chuck key is removed from
the chuck before starting any drilling operation.
Drilling speeds
Important factors when determining the best drilling
speed:
• Type of material
• Size of the hole to be drilled
• Type of drill bit or cutter
• Desired quality of the cut
Remember, smaller drill bits require greater speed than
large drill bits. Softer materials require greater speed
than harder materials.
Drilling metal
• Use metal-piercing twist drill bits.
• It is always necessary to lubricate the tip of the drill
with oil to prevent overheating the drill bit.
•
All metal workpieces should be clamped down
securely. Any tilting, twisting, or shifting causes a
rough drill hole, and increases the potential of drill bit
breakage.
• Never hold a metal workpiece with your bare hands.
The cutting edge of the drill bit may seize the
workpiece and throw it, causing serious injury. The drill
bit will break if the metal piece suddenly hits the
column.
• If the metal is flat, clamp a piece of wood under it to
prevent turning. If it cannot be laid flat on the table,
then it should be blocked and clamped.
Drilling wood
• Brad point bits are preferred. Metal piercing twist bits
may be used on wood.
• Do not use auger bits. They turn so rapidly that they lift
the workpiece off the table and whirl it around.
• Always protect the drill bit by positioning the table so
the drill bit will enter the center hole when drilling
through the workpiece.
• To prevent splintering, feed slowly when the bit is
about to cut through to the backside of the workpiece.
• To reduce splintering and protect the point of the bit,
use scrap wood as a backing or a base block under
the workpiece.
Feeding the bit
• Pull down on the feed handles with only enough force
to allow the drill bit to cut.
• Feeding too rapidly might stall the motor, cause the
belt to slip, damage the workpiece, or break the drill
bit.
• Feeding too slowly will cause the drill bit to heat up
and burn the workpiece.
WARNING
!