The complete gear set for C2 mini lathe aka Sieg, Rotwerk, RC6120,...
The gear set includes metric and inch gears.
Also I made a 127 tooth gear, which is not part of sold sets, because it will not fit into the machine,unless you modify the gear train.
Only the 127 tooth gear allows to cut "real" inch threads on a metric lathe, but the 57 tooth gear is close enough for most cases.
P.S.: I also added a non-standard 39 tooth gear which is handy when turning a 48 tpi thread.
It reduces the error of 0.32% when using the 20, 35, 40, 65 combination to 0.06% with the 20, 55, 39, 80 combination.
P.P.S.: 63 tooth gear added
September 26th 2018:
By request I also uploaded the DXF files. But these only contain the outher contour. You will have to extrude the object and create the keyed center bore by yourself.
The gears have been layed out using the gear-plugin of InkScape.
Then exported and extruded in OpenScad.