Page Comparison

Please box up the following three items for return
Please use your original CMC box to box up the following four items into one box. If you do not have your original packaging the box the new CMC arrived in can be used. • Board • Gantry • Head • ECU/Driver Pack Please see the following removal instructions for each part.

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Secure the Gantry: Loosening Drive Belt
Move the gantry to the right side of the board about two feet from the right edge (to leave room for the packaging foam corners).
Remove the 5/32” Allen screws and washers from the lower gantry plate.
Locate the 3/16” Allen belt tensioner screw that’s located on the right bottom side of the lower rail and marked with a red dot. Loosen this screw one turn only. WARNING: Make sure you do not over-loosen this screw. One full turn is usually sufficient.
There should be some movement in the belt tensioner. The 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 rail and the springs are not visible.
Go back and tighten the 3/16” Allen belt tensioner screw.
Lift the drive belt from the rail. Pushing the drive belt end to the right may assist in getting a hold of it.
Wind up the drive belt, and rubber-band it. Repeat steps 4 through 8 with the upper rail.

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Stop Screw
If your model only has a Stop Screw without the alignment plate, remove the stop screw.

Attaching Shipping Blocks

If the shipping blocks have been misplaced, please find a way to secure the gantry so that it does not move during shipment.

Loosely place the T-Nut onto the shipping blocks and slide onto the rail on each side of the gantry. The left one is placed on the underside of the rail, and the right one is placed on the top of the rail.

Tighten into place.

Place the other two shipping blocks on the lower rail. They will be placed on the top of the bottom rail. Tighten into place.

Reinstall the Stop Plate
Reinstall your Gantry Stop as described below.

Magnetic Gantry Stop
Slide the black Magnetic Gantry Stop Plate in from the left end of the rail keeping the pin towards you.
Place the pin into the hole and tighten the top 3/16” stop screw.

Silver Gantry Stop Plate
Slide the alignment plate in from the left end of the rail and line up with the holes on the rail.
Tighten the back left T-Nut screw. Replace the right front 3/16” stop screw and tighten.

Stop Screw
If your model only has a Stop Screw without the alignment plate, replace the stop screw.

Installing the Drive Belt onto the Rail
Lightly pull the coiled drive belt toward the right to take up the slack and pull the belt anchor into place flush with the end of the CMC.
Remove the rubber-band from the drive belt and loosely lay the drive belt along the rail channel.
Pull the loose 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 rail channel. Slide the screw of the belt end into the belt tensioner slot.
Remove the 5/32” Allen screws and washers from the belt tensioner.
Place the two Allen screw and washer into the holes provided on the lower gantry plate. Place them so that the screw 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 rail marked with a red dot.
The belt tensioner should spring fully into place. WARNING: Make sure you do not over-loosen this screw. One full turn is usually sufficient.
Snugly tighten the Allen belt tensioner screw on the bottom right of upper and lower rails. Repeat these steps through with the upper rail.
Replace the two gantry covers using the two screws removed earlier.