SOUTH BEND LATHE MODEL 9C ( 1937-1940 ) 80/63 METRIC TRANSLATION

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SummaryThis is a Metric Translation gear for cutting metric threads on an imperial leadscrew lathe this 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 The 63 tooth has an designed inside dia of 75mm but ends up about 74.4mm The 80 tooth has a designed inside dia of 100mm but ends up about 99.3mm The 63 tooth ring has 1mm step so it give a gap between the gears so it is 3/8" wide + 1mm The 80 tooth ring is 3/8" wide which is the width of the standard South Bend gears It's mainly a space problem that dictates which of the translation gears you use, there may be others but these are the common ones that I know of. I will be uploading designs for a 127/100 metric translation gear which gives no errors in the generated pitches. The 80/63 gives an error of 0.0125% The another gear set 47/37 gives an error of -0.0212%Print SettingsRafts: NoSupports: NoResolution: I used a 0.3Infill: 100 %Notes: The centre I made is of hardwood as that is what I had laying around, but form board or marine ply would probably be a better option. I turned the timber so that the ABS ring just slipped over then cover with super glue and made sure it ran true before the glue set