Drive Belt Position Alignment: All Current CMC Models

If the Red Lines on the Drive Belt do not line up to the Red Lines on the Toothed Pulley on the Gantry, it shows that the Drive Belt has skipped a tooth and that the cuts will be out of square.

Remove the Gantry Covers by unscrewing the screws that hold it in place and set aside.

Move the Gantry to the right and back to the far left.

Looking at the upper Drive Belt, slowly move the Gantry toward the right again until you see a Red Line on the Drive Belt.

Confirm that the Red Line lines up with the Red Line on the Toothed Pulley.

Without moving the Gantry, look at the lower Drive Belt and make sure the Red Lines line up on the Drive Belt and the Toothed Pulley.

Determine which one does not line up, top or bottom Drive Belt, and we will adjust the Drive Belt of the one that does not line up.

For this example, we will be loosening the lower Drive Belt because the marks on the lower Drive Belt do not line up.

Remove the 5/32” Allen screws and washers from the lower Gantry Plate.

• These were placed here to assist in loosening the Belt Tensioner.

Look for Red Dots (only these screws are to be adjusted).

Loosen one full turn only the 3/16” Allen Belt Tensioner Screw located on the right bottom side of the lower Board Rail marked with a red dot.

Only loosen it so that there is some movement in the Belt Tensioner; about one full turn.

WARNING: Do not over loosen this screw. One full turn is usually sufficient.

The Belt Tensioner Springs should be visible.

Locate the Belt Tensioner Hole on the end of the Belt Tensioner.

Place the 5/32” Allen screw and washer we removed from the lower Gantry Plate into the Belt Tensioner Hole.

Tighten the Allen screw until Belt Tensioner is flush with the Board Rail and the Belt Tensioner Springs are not visible.

Go back and tighten the 3/16” Allen Belt Tensioner Screw on the right bottom side of the lower Board Rail marked with a red dot.

Lift the Drive Belt end out of the Belt Tensioner Slot.

Pushing the Drive Belt end to the right may assist in getting a hold of it.

Wind up the Drive Belt, and rubberband it.

Move the Gantry left/right until the Red Line of the Drive Belt lines up to the Red Line on the Toothed Pulley.

Using the slack we have created on the bottom Drive Belt, pull the Drive Belt around the Toothed Pulley, making sure that the Red Lines line up.

You may need to manually move the Drive Belt over to the correct tooth to line up the Red Lines.

Do not move the Gantry after red marks lined up.

Pull the loose Drive Belt end to the right, making sure that the Drive Belt is not twisted and that the teeth are facing down toward the Board into the Board Rail channel.

Slide the screw of the Drive Belt end into the Belt Tensioner Slot.

Click the screw of the Drive Belt end into the Belt Tensioner Slot on the end of the Board Rail.

Go back and make sure Red Lines are still lined up.

Locate 5/32” Allen Screw on the Belt Tensioner.

Remove the 5/32” Allen Screw and washer from the Belt Tensioner.

Leave the Gantry where it is.

Place the two Allen screws and washers into the holes provided on the lower Gantry Plate. Place them so that the screws protrudes only slightly from the back of the plate.

Loosen one full turn only the 3/16” Allen Belt Tensioner Screw from the right bottom side of the lower Board Rail marked with a red dot

WARNING: Make sure you do not over tighten this screw. One full turn is sufficient.

The Belt Tensioner should spring fully into place

Go back and snugly tighten the 3/16” Allen Belt Tensioner Screw from the right bottom Board Rail and the marked with a red dot.

Reinstall the Gantry Cover(s), replacing the screws you removed earlier.

Do a test cut. Cut a 2x2 square, with 2” Borders, NOT cutting the outside. Measure the Border to the opening and make sure it measures 2”. If it does not, adjust the Horizontal Home in the Configurations Screen accordingly.

• If the Border is too big, decrease the Horizontal Home.

• If the Border is too small, increase the Horizontal Home.

Do another test cut. Continue making adjustments until it measures 2”. If you need assistance, call Technical Support.

Make sure that the Gantry is straight.

• Cut a rectangle that is about 2x24”, NOT cutting the outside, with 2” Borders.

Measure the Borders to the opening at the bottom of the mat closest to the vertical clamps, then measure the Borders to the opening at the top of the mat closest to the vertical clamps.

If the Borders are not measuring 2” in both places, call Technical Support for assistance.

See Fine-Tune Drive Belt Position to reset the Drive Belt Position if the CMC is cutting out of square and the Red Lines on the Drive Belt line up to the Red Lines on the Toothed Pulley.