Tri Tool 212B Beveler Single Point Flange Facer - Manual (Page 16)

92-0729 : Rev. 070928
TRI TOOL INC.
16
CUTTING SPEEDS AND FEEDS
The following information is provided in good faith for general guidance to the
operator. Different materials, pipe diameters, use of coolants or dry cutting, will
change these procedures. To accomplish the best cycle times and surface fin-
ishes, experimentation may be necessary to obtain optimum results.
The model 212B-SP uses titanium nitrate coated carbide inserts, which will pro-
vide good results for most applications.
The model 212B BEVELMASTER TM , powered with the recommended air sup-
ply will deliver a head stock maximum free speed of 22 rpm (no load). At maxi-
mum h.p. the headstock will rotate at 11 rpm (Approximately full load). Using
these numbers, it is possible to establish the right speeds for different materi-
als to be cut.
One of the worst conditions, is a 24”dia. (609.6mm) maximum cutting diameter,
stainless pipe or tube, dry cutting. When the single point unit is in
position,(adjusted to take a chip width of approximately .080” (2.0mm), and the
feed rate adjusted to .003” to .004” (.08mm to .10mm) per feed tripper) and
ready to start cutting, depress the throttle, and slowly rotate the headstock.
Observe for any interference between the tool and the pipe for one full revolu-
tion. If every thing clears,engage the two (2) feed tripping wheels. Increase the
rotating speed gradually, to approximately 10 to 15 rpm, when the tool bit touches
the pipe,at one point, reduce the rotating speed to approximately 5 to 8 rpm,
and disengage one (1) feed tripping wheel. With this feed rate and rotation
speed increase the throttle speed gradually, to maintain the rotation speed as
more power is required until the tool has a continuous chip load. As the tool
obtains a continuous chip load, the rpm drops to a slower speed. Now increase
the throttle speed to maximum. Observe the chip, the finish, and any possible
chatter that can occur in the cut from a non-optimum feed and/or rpm condition.
The tool holder is equipped with 2 tapered gibs and if a gib is loose, chatter will
occur in the cut, most likely around the full perimeter of the pipe, and further
adjustments will will be futile. If the gibs are tight, and localized chatter, quadrant
chatter or resonance occurs, varying the rpm of the cutting head by rotating the
throttle valve, slower and faster alternately, for each rotation of the cutting head,
will get rid of resonance that can occur with certain types of materials and/or
conditions. Make sure that the mandrel head is mounted very tight in the pipe.
If results are satisfactory, leave the rpm and the feed rate alone. To improve
productivity try increasing the feed rate by engaging the second tripping wheel.
The rpm will drop again. Increasing the feed rate will reduce the rpm, and is not
always a solution to obtain a higher material removal rate. In most cases, with
carbide inserts, a higher rpm, less chip width, and a high feed rate, is preferable.
If surface finish and/or speed is satisfactory, you have it “dialed in”! . If not de-
creasing or increasing the chip width,
and/or increasing or decreasing the
feed rate, and/or decreasing or increasing rotation speed, normally the right
combination of feed rate, rpm and chip width will produce satisfactory results.
Again, materials, and different conditions, alter the rules. Common sense and
analytical deduction will solve most problems.