My Binding Challenge Spartan 150M Service Manual download pdf (Page 13)

3.0 Maintenance Guide

Note: Once the backgauge is square, check the backgauge accuracy (see section 3.4.2 ) to make

sure it is accurate.

3.4.2 Backgauge Accuracy Adjustment

If the backgauge position readout does not match the actual measurement between the knife and the

backgauge, the accuracy can be adjusted. The accuracy can be checked by the following procedure:

NOTE: The backgauge should be squared before attempting to adjust the accuracy. (See Section

3.4.1 Squaring the Backgauge, page 10.)

1. Place a 1/4 to 1/2” lift of 8-1/2 x 11 “ paper against the center of the backgauge.

2. Using the backgauge position readout, bring the lift up to the 10.00” position and make a cut.

Then move the backgauge up to 5.00” and make another cut.

3. Take a sheet from the center of each lift and compare them to each other. The cutter will

always space accurately between cuts (in this case the 10” and 5” cuts) whether the overall

accuracy is correct of not (Figure 7). The front stack will be a true 5”, but the paper left

against the backgauge will not be if the backgauge position is inaccurate.

Figure 7

4. The backgauge accuracy can be corrected by adjusting the preset screw attached to the

bottom of the backgauge nut assembly (Figure 8). Turn off power and disconnect the power

cord. With the top cover ON, place machine on a flat level surface on it’s left side and

remove bottom cover. Place a 3/16” Allen wrench in the preset screw and hold in position

while loosening the jam nut. Now adjust the screw as follows:

• If test pile is short (back pile is less than 5”), turn screw out (counterclockwise).

• If test pile is long (back pile is more than 5”), turn screw in (clockwise).

1/4 turn = .012” backgauge adjustment

1/3 turn = .016 (1/64”)

1/2 turn = .024”

2/3 turn = .032” (1/32”)

1 turn = .048”

Questionable Accurate

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My Binding Challenge Spartan 150M Service Manual Page 13