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Chinese lathe | Model Engineer


What gears do you have?
If it is like my Sieg C3 mini lathe the Manual lists, in various places, 2 x 20T, 30T, 35T, 2 x 40T, 2 x 45T, 50T 55T, 57T, 60T, 65T , and 2 x 80T
Against the time when I want to cut Imperial threads, I bought a 63T, (and an extra 45T for some reason. )
For the finest feed rate, the manual advises Driver 20T: Stud 80T/20T Leadscrew:80T
This gives a 16:1 reduction, so a 1.5 mm Leadscrew will produce a feed of 0.9375 mm / rev of the chuck.
If you want an even finer feed, Neil Wyatt published a program to print 100T gears. Not having a 3D printer, I made mine, but it means that the gear cover has to be modified on the non - operator side to clear the gears, and the locking for the Banjo needs to be modified to clear a foul. with the !00T gear on the Leadscrew. ....

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