Tri Tool 302 Tube Squaring User Manual

Page 14

TRI TOOL INC.

92-0547 : Rev. 140610

NOTE:

Using the maximum speed available from the motor, turn the machine on and

advance the tool bit into the end.

Be careful and not risk damage to the tool bit from an excessive cut.

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).

Once 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).

When the desired length is achieved, let the machine make one or two

revolutions without feeding the machine (i.e. while holding the feed handle

in a fixed position). If the feed backed out before the making the finish

revolutions the end will not be square. This effect will be most noticeable on

larger diameter tubes.

Back the tool bit away from the end with the machine running.

Never stop the machine with the tool bit in the cut as this can chip the tool bit

99-xxxx Series TUBE SQUARING Tool Bits

The 99-xxxx series tool bit achieves the best end results when run at slow

speed. This is especially true with electropolished tube. Electropolished

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. Further, the cutting speed must be kept very slow to avoid heat at

the tool bit. If the tool bit to tube interface is allowed to get hot then it is like a

dull knife to cut warm butter. The material just flows away from the bit forming

large burrs. The DURABIT Series tool bits have a unique cutting edge design

and proprietary coating, which work best at high cutting speeds and are

the most commonly recommended tool bits for tube squaring application.

However, for some applications the 99 series tool bits still find a home and the

following cutting procedures apply.

Visually verify that the tube bit will clear 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 will engage the tube will a very heavy cut.

Turn the machine on, and using the speed control of the motor, set the RPM

between 30 and 50 then advance the tool bit into the end. Use the low end