Greenwatts

Drive ...cont

Cut out two pieces of flat ABS for the front and back shaft guide plates. They will be the exact dimensions as the motor mounting plate. Cut out a bottom plate with a width equal to the length of the worm gear shaft plus 2X the thickness of the ABS flat stock. The length of the bottom plate will be the same as the length of the motor and guide plates. Also cut out some small squares to be used for the shaft guides. Drill two motor shaft guides for the front shaft guide plate. The hole diameters in the shaft guides should provide a snug fit onto the shafts. Later in the assembly process these holes will be drilled again to provide a looser fit.

Tack cement (to be removed later) the front guide plate to the bottom plate and also tack a support bar on each end to hold the two pieces at a perfect 90deg angle. Support bars are simply pieces a flat ABS that can be used during assembly to hold things in place. Tack cement them so they can be easily removed when no longer required. When this assembly has dried place the two shaft guides on the ends of the motor shafts and cement the outer surface of the guides. Carefully position the motor assembly into place so the cemented guide surfaces adhere to the front guide plate. Make any adjustments before the cement has a chance to dry making sure the front guide plate and the motor mounting plate are perfectly aligned. Keep everything still until the cement on the guides has had a chance to cure.

Cut and drill a square piece of flat ABS for the front worm gear shaft guide. Remove the motor assembly and place the worm gear assembly into position. Use a wide elastic band to hold the spur gear against the two motor gears making sure the gear teeth mesh properly. Place the shaft guide on the end or the worm gear shaft and cement the outer surface. While holding the other end of the worm gear shaft so that it is properly aligned place the motor assembly back into position which will cement the worm gear shaft guide to the front guide plate. Adjust the alignment of the worm gear shaft so that it is perfectly aligned parallel to the two motors then wait for the cement to cure on the shaft guide.