SummaryThis is the start of a set of change gears for cutting threads on an 8TPI imperial leadscrew lathe these was designed for a South Bend lathe model 9C. The teeth have 14.5 degree pressure angle The gear has a DP of 18 The module is 1.411 True involute form are 3/8" wide with a centre bore of 0.5625" key is 1/8"wide Will put up in sets of 5 If you have a need for any other gears please let me know and I can look at it for you.Print SettingsRafts: Doesn't MatterSupports: NoResolution: I used a 0.3Infill: 100 %Notes: the centre hole will print under size so will need cleaning out to fit the shafts and of course clean up around the teeth.