Backgauge Position Accuracy Adjustment - Challenge CHAMPION 305 Instructions And Parts Manual

12.0 Adjustments
To adjust squareness:
1. As machine wears, make sure the backgauge gibs are set properly first (see Backgauge
Gibs), then follow steps 2 through 5.
NOTE: Gib adjustment is not necessary on initial machine setup because they have been
adjusted at the factory.
2. Loosen backgauge locking screw (smaller head). Loosen the jam nuts on the backgauge
squaring screws.
3. Back off the squaring screw on the side that the trim occurred and tighten the other.
4. With the squaring screws tight, make another test. Continue to adjust and test until no trim
occurs when testing in either sequence.
5. Tighten the jam nuts and lock screw.
NOTE: Once the backgauge is square, restore power to the machine and check the backgauge
accuracy to make sure it is accurate (see next section).

12.4 Backgauge Position Accuracy Adjustment

If the backgauge position readout does not match the actual measurement between the knife and the
backgauge, the cutter must be re-calibrated.
The accuracy can be checked by comparing cut sheets of paper. This process is described below.
NOTE: The backgauge gibs should be adjusted and the backgauge squared before attempting to re-
zero, see Adjustments.
1. Place a 1/4 to 1/2 inch (5 to 13mm) pile of 8-1/2 X 11 (A4) paper against the center of the
backgauge.
2. Trim cut lengthwise and rotate 180
up to the 10" (254mm) position and make a cut. Move the backgauge up to 5" (127mm) and
make another cut.
3. Take several sheets from the center of each lift and compare them to each other. The
encoder system on your cutter will space accurately between your 10" (254mm) and 5"
(127mm) cuts, whether the overall accuracy is correct or not. The stack of paper between
the 10" (254mm) and 5" (127mm) cuts will be a true 5", but the paper left against the
backgauge will not- if the backgauge position readout is off.
44
Locking
Screw
Squaring Screws
Figure 33
0 . Using the backgauge position readout, bring the paper