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Before any Conair puller/cutters are shipped, they are tested
for cut time repeatability to be sure they are within perfor-
mance specifications. The repeatability test checks the perfor-
mance of the rotary knife cutter to return the home park posi-
tion after a complete cut. Acceptable repeatability times
allowed for each cutter model prior to shipping are:
Type of Cutter Repeatability Time
AC Pneumatic Cutter Less than 1 millisecond
DC Pneumatic Cutter Less than 1.5 millisecond
Positional Servo (FX) Less than 0.1 millisecond
Note: 1-millisecond at 60 feet per minute is equal to .012 inches.
The repeatability mode is built into the Conair cutter controls
and allows you to perform similar tests, without any external
test equipment. It is recommended that you check repeatability
on a regular basis. Acceleration/deceleration delays of the
servo do not contribute to repeatability error; any error is
attributed solely to motor stability, couplings, assembly,
power, and proximity sensor alignment.
Use any blade speed and line speed. The line speed is only
seen while in the Encoder or Product modes. It is recommend-
ed that the tests be performed at cut intervals between 0.5 and
5-seconds. Do not change the blade speed or the line speed
after starting the test.
To test repeatability:
Turn on the cutter. Performing the test with the cutter
off-line shows problems with the cutter; performing the
test with the cutter on-line shows a problem with the
puller.
Place the cutter in any mode except follower
mode.
Press the Cut On/Off button;
the cutter is activated
automatically.
Press and hold the Move Right button
for a minimum of 5 seconds.
Read the results on the display.
Repeat the test by pressing the Reset/Test Cut button to begin
a new sample period.
To end the Repeatability test, press any button except the
Reset/Test Cut button. The LED returns to its normal display.
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TESTING
REPEATABILITY
UGE059/1003 SC-5 SURE CUT Servo Knife Cutter
TROUBLESHOOTING 6-17