General Machine Products 89010 Breeze Micro Fiber Cable Blowing Machine - Manual (Page 35)

Page 35 of 43 General Machine Products Co., Inc.
Torque Control Potentiometer Setting
0
0.25
0.5
0.75
1
1 10
Coefficeint of friction
%
of
m
a
x
im
um
r
ot
a
ti
on
(
c
loc
k
w
is
e
)
U1
U2
U3
U4
U5
U6
3. Referring to the chart above. The “x” axis (the bottom line) represents the coefficient of
friction; 1 is very low: 10 is very high. Look along this line from left to right. Pick a vertical line
that is approximately the value of the coefficient of friction. Look vertically upward along this
line. It crosses a series of angled lines, these lines are numbered U1, U2 etc. where the ver-
tical line crosses the angled line with the U figure determined from step 1 make a mark on
the chart. Draw a horizontal line (parallel with the other horizontal lines on the chart) from
the marked point. Where this line crosses the “y” axis (the vertical line at the extreme left
hand of the chart), make a second mark on the chart. The height of this line represents the
% of maximum clockwise rotation of the torque control. If this line is very close to the figure
0.5 marked on the “y” axis, set the torque control potentiometer approximately one half of
the way around its maximum travel etc.
There is an alternative way of arriving at the appropriate setting for the torque control poten-
tiometer.
Do the following:
Select a sample of the cable to be used. Pass the cable through the machine as described
in the manual. Feed the cable into the beginning of a length of sample tube (say 5 metres
long). Seal the open end of the tube. Position the torque control potentiometer at the posi-
tion determined by the recommendations in this appendix, Start the machine. Drive the ca-
ble hard into the sealed end of the sample length of tube. The rollers will stop turning, this is
because the torque limit has been reached. Repeat this procedure, each time turning the
torque potentiometer a little further clockwise. Eventually, the cable will buckle. The setting
of the torque control potentiometer is now a little too far clockwise. Turn it back (counter
clockwise) a little. This is the optimum setting.
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