3D Printed 109 Gears

[aoresteen]

......... And I do not know for certain that all models of the AA latthes use the same number of tooth counts. ........

The threading chart part number in the 109.0702 of 1941 is #3255. The same part number 3255 for the threading chart is listed in the 109.21270 (AKA Model 80) part listings so I think you can assume that the tooth counts are the same for all the 109 models up to the 109.21270. No clue what the 109.21280 used.

EDIT: Just found the parts pdf for the 109.21280. It also uses the threading chart 3255, So it looks like all the 109 lathes use the same gears