TRI TOOL INC.
92-0547 Rev. 210906
18
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When the desired length is achieved, let the machine make one or two revolutions
without feeding the machine (holding the feed handle in a fixed position). If the feed
is backed out before the making the finish revolutions the end will not be square.
This effect will be most noticeable on larger diameter tubes.
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Back the tool bit away from the end with the machine running.
CAUTION
CAUTION: Do not do stop the machine with the tool bit in the cut. The tool bit may
chip.
99-xxxx Series Tube Squaring Tool Bits
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The 99-xxxx series tool bit works at slow speeds. This is especially true with
electro-polished tubes. Electro-polished austenitic stainless steel tube alloys are
very soft and tend to “mush” away from the cutting edge. If the tube or the tool bit
get warm, this tendency is increased. The cutting speed must be kept very slow to
avoid creating heat at the tool bit. The material will flow away from the bit and form
large burrs.
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Make sure that the tube bit clears the end of the tube with the feed fully retracted
(normal return position). A tube end that is cut at an angle (not square) can be set
such that the tool bit clears the end, but when the tool bit is rotated, it engages the
tube with a very heavy cut.
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Turn the machine on and set the RPM between 30 and 50.
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Advance the tool bit into the end. Use the low end of the speed range
(30 RPM) for 0.50 and larger tubes and the high end (50 RPM) of the range for
smaller tubes.
CAUTION
CAUTION: Do not do an excess cut to reduce the risk of damage to the tool bit from
an excessive cut.
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On interrupted or out of square ends, advances the bit slowly with light feed
pressure (torque applied to the feed handle) until a continuous cut is achieved (the
tool bit is cutting all the way around the end). The operator must increase the speed
control position to maintain the cutting speed as the load increases.
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After a full cut is achieved use moderate feed pressure to finish the cut (either to a
just achieve a quality end or to cut to a scribe line). The operator should strive to
achieve a loose but continuous chip. The chip should be a loose curl, not a tight
spiral.
