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Installing the gantry.   

Remove the screws from the plywood end plates, remove the restraining bolt from the bottom of the gantry legs.

Install gantry on table, with the V bearing riding on the guides. 

The gantry may come fully assembled, with all motors, and sprockets pre-installed

Adjust table guides by bringing the gantry to end of table, gently adjust the guide to center under  the V bearings, lightly tighten the screw at that screw point of guide. Move gantry to just past the next screw point and repeat the above step for all screw points until  gantry rides smoothly from end to end, secure all screws.

Gantry ride can be improved by sanding and lubing  the guide lightly with a fine grit sandpaper.

Next install the X drive belt.

Move gantry to one end of the table.

Begin on the side without motor, attach belt at the other end of table,  with belt teeth side down,  slide the belt under the holder plate on your belt wing, bring the belt down through the slot in the wing, and pull through to get 1 to 2 inches of belt on this end. Tighten bolts on this wing being careful not to cut belt by over tightening.

Install belt under the first left idler sprocket, then up and over top cross drive sprocket  down and  under right idler sprocket.

Attach belt to belt wing, the same as before, except pull this belt to tension (DO NOT over tension) your belt should be without slack, over tensioning will result in damage to your lower (idler sprocket) bolts

This is best done by two people,  have one person hold the belt, while the other uses two 7/16 inch  wrenches to tighten the belt holder in place.

On the motor side start by loosening the end “tensioning nut” (9/16 wrench) and the sprocket (1/8 inch Allen key) , on the cross drive, only on the motor side.

Begin on the side with motor, attach belt at the other end of table,  with belt teeth side down,  slide the belt under the holder plate on your belt wing, bring the belt down through the slot in the wing, and pull through to get 1 to 2 inches of belt on this end. Tighten bolts on this wing being careful not to cut belt by over tightening.

Install belt under the first right motor idler sprocket, then up and over motor drive sprocket  down and  under left motor idler sprocket, up and over cross drive sprocket then down and under last sprocket, secure to belt wing as before.

Line up your gantry, by pulling the entire gantry all the way to one end of the table, until the gantry side plates are both in contact with the wing mounts of the  table.

Hold the gantry in place, tighten the end bolt on the cross drive, to tension the cross drive shaft with  very little pressure, tighten the cross drive sprocket with a 1/8 inch Allen key .

The gantry will move from end to end with only the resistance of the motor itself, if any V bearings jump off track, try adjusting the riding guides  first,  if it is out of time repeat steps above.

Place the gantry in the middle of the table, install the two (2) anti lift bearings in slot on gantry side plates. 

The gantry should be able to ride smoothly, if it binds on the rail, simply loosen the anti lift bearings.