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DON’T
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Run
a holesaw too fast- it will cut faster at a slower speed than it does at
speed higher than recommended.
If it runs
too fast, it will not cut, but wear out.
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DON’T
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Allow
tooth points to rub over the work without digging in to take a chip.
Rubbing the tooth points dulls them so they can’t cut.
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DON’T
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Set
the pilot drill point beyond the tooth points more than the thickness of
the work. If the drill pierces the work before the saw teeth are in
contact, the saw can hit the work with sufficient shock to break the saw
or the teeth.
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DON’T
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Operate
hole saws without cutting oil (except in cast iron) or the abrasion will
cause enough heat to damage the cutting ability of the saw.
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DON’T
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Chuck
too loosely or off center. An
improperly chucked hole saw will cause damaging vibrations.
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DON’T
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Try
to saw holes at an angle to the work surface.
When teeth do not contact the work evenly the hole saw will be
twisted out of round and will break.
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DON’T
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Allow
hole saw and drive unit to wobble or orbit around the pilot drill, as
this sets up damaging stresses to strip the teeth or break the saw.
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DON’T
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Begin
sawing with arbor so loose in cap that it will (1) Tear our threads in
saw cap, or (2) become inseparable (too tightly screwed in).
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DON’T
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Allow
drive pins to retract from holes while saw is in operation. Loose drive
pins can grind a hole in the cap.
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DON’T
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Let
loose clothing or long hair get near a revolving hole saw.
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