Northern Industrial Tools 6237D - Manual (Page 13)

13
• If the tool is operated continuously until the battery
cartridge has discharged, allow the tool to rest for 15
minutes before proceeding with a fresh battery.
Drilling operation
First, slide the action mode change lever to the position of
symbol.
Drilling in wood
• When drilling in wood, the 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.
Drilling in metal
• To prevent the bit from slipping when starting a hole,
make an indentation with a center-punch and hammer at
the point to be drilled. Place the point of the bit in the
indentation 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 at the
time of hole break through. Hold the tool firmly and exert
care when the bit begins to break through the workpiece.
• 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.
Nominal diameter of
wood screw (mm)
3.1 (1/8”)
3.5 (9/64”)
3.8 (5/32”)
4.5 (11/64”)
4.8 (3/16”)
5.1 (13/64”)
5.5 (7/32”)
5.8 (7/32”)
6.1 (15/64”)
Recommended size
of pilot hole (mm)
2.0 - 2.2 (5/64” - 3/32”)
2.2 - 2.5 (3/32” - 3/32”)
2.5 - 2.8 (3/32” - 7/64”)
2.9 - 3.2 (7/64” - 1/8”)
3.1 - 3.4 (1/8” - 9/64”)
3.3 - 3.6 (1/8” - 9/64”)
3.7 - 3.9 (9/64” - 5/32”)
4.0 - 4.2 (5/32” - 11/64”)
4.2 - 4.4 (11/64” - 11/64”)