CAD drawings were traced from scans of the plastic parts, and then redrafted using precise, symmetric gear geometry. The gears were cut from 1/2" 1018 cold-finished mild steel.

The internal teeth are metric .8 module, with a root radius of .040". The teeth were gaged with gear measuring pins and the OMAX 55100 setup adjusted to yield a tooth profile accurate to about .002" TIR.

The cut cost on these parts is about $40 each.  These are about at the limit of precision for our machine.