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accessory. Look this table over and become
familiar with it.
Ultimately, the best way to determine the
correct speed for work on any material is to
practice for a few minutes on a piece of
scrap, even after referring to the chart. You
can quickly learn that a slower or faster
speed is more effective just by observing
what happens as you make a pass or two at
different speeds. When working with plastic,
for example, start at a slow rate of speed
and increase the speed until you observe
that the plastic is melting at the point of
contact. Then reduce the speed slightly to
get the optimum working speed.
Some rules of thumb in regard to speed:
1. Plastic and materials that melt at low
i temperatures should be cut at low
;speeds.
2. Polishing, buffing and cleaning with a wire
brush must be done at speeds not greater
than 15,000 RPM to prevent damage to
the brush.
3. Wood should be cut at high speed.
4. Iron or steel should be cut at high speed if
using tungsten carbide accessory, but at
slower speeds if using high speed steel
cutters. If a high speed steel cutter starts
to chatter -- this normally means it is
running too slow.
5. Aluminum, copper alloys, lead alloys, zinc
alloys and tin may be cut at various
speeds, depending on the type of cutting
being done. Use paraffin or other suitable
lubricant on the cutter to prevent the cut
material from adhering to the cutter teeth.
Increasing the pressure on the tool is not the
answer when it is not cutting as you think it
should. Perhaps you should be using a
different cutter, and perhaps an adjustment
in speed would solve the problem. Leaning
on the tool does not help. The correct speed
will make using the rotary tool effortless.
BRUSHING PRESSURE
1. Remember, the tips of a wire brush do the
work. Operate the brush with the lightest
pressure so only the tips of the wire come in
contact with the work.
2. If heavier pressures are used, the wires
will be overstressed, resulting in a wiping
action; and if this is continued, the life of the
brush will be shortened due to wire fatigue.
3. Apply the brush to the work in such a way
that as much of the brush face as possible is
in full contact with the work. Applying the
side or edge of the brush to the work wil!
result in wire breakage and shortened brush
life.
CORRECT:
Wire tips
doing the
work.
S
INCORRECT:
Excessive
pressure can
cause wire
breakage.
S
15