Greenwatts

Drive ...cont

Cut a bolt or threaded rod for the worm gear shaft to a length slightly longer than the DC motor shafts by adding about half the thickness of the ABS flat stock to its length (see the diagram on left).

The spur gear will be fitted to one end of the worm gear shaft. It is possible the file a perfectly centered shaft diameter by placing the worm gear shaft in a hand drill, lock two nuts to act as a guide for the file and starting with a course file machine the worm gear shaft to match the center mounting hole diameter on the spur gear. The spur gear can then be presses onto the worm gear shaft. Both ends of the worm gear shaft must also be machined to fit the shaft guides.

Worm Gear Shaft

Use ABS flat stock to make the motor mounting plate as shown in the drawing below. The motors are mounted vertically with spur gear/worm gear assembly sitting to the side but centered between the two motors. When drilling the holes for the motors it may be easier to make a template to position the motors. Mount the motors onto the motor mounting plate.

Motor Plate Layout