Drilling Operation; Drilling In Metal; Drilling In Wood - Makita 6221D Instruction Manual

NOTE :
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Make sure that the driver bit is inserted straight in the screw head, or the screw and/or
bit may be damaged.
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When driving wood screws, predrill pilot
holes to make driving easier and to pre-
vent splitting of the workpiece. See the
chart.
Drilling operation
First, turn the adjusting ring so that the pointer on the adjusting ring points to the
-8.-
marking. Then proceed as follows.
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Drilling in wood
When drilling in wood, best results are obtained with wood drills equipped with a guide
screw. The guide screw makes drilling easier by pulling the bit into the workpiece.
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Drilling in metal
To prevent the bit from slipping when starting a hole, make an indentation with a center-
punch and hammer
a t
the point to be drilled place the point of the bit in the indenta-
tion and start drilling.
Use a cutting lubricant when drilling metals. The exceptions are iron and brass which
should be drilled dry.
CAUTION :
*Pressing excessively on the tool will not speed up the drilling. In fact, this excessive
pressure will only serve to damage the tip of your bit, decrease the tool performance
and shorten the service life of the tool.
*There
is a
tremendous force exerted on the tool/bit a t the time of hole breakthrough.
Hold the tool firmly and exert care when the bit begins to break through the workpiece.
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A stuck bit can be removed simply by setting the reversing switch to reverse rotation in
order to back out. However, the tool may back out abruptly if you do not hold
it
firmly.
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Always secure small workpieces in a vise or similar hold-down device.
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