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Peter Bell11/10/2013 15:30:53
376 forum posts
164 photos


I am making a starter motor for an engine without a ring gear using a belt drive around the flywheel. Basically a stater pinion (approx 2" dia) meshes into a nut on an alternator shaft which is cnced out to allow the pinion to enter and turn the pully, belt and engine. I have the prototype working quite well but only using mild steel for this nut. As the pinion is hard and tough I want to make the drive nut from a better steel but it needs to reasonably easy to machine.

Anyone any suggestions regarding material, EN8 springs to mind or is there a better alternative even if I need to heat treat i?

Sorry for poor descrition and no pics as job not at home.

ronan walsh11/10/2013 17:03:23
546 forum posts
32 photos

What thread form will the nut be ? Any of the engineering steels (en19t en24t) are ok to turn and thread and are very tough.

Peter Bell11/10/2013 18:46:18
376 forum posts
164 photos

The thread is M16 x 1.5 which I think is conduit and probably why I have a tap. Do the engineering steels suggested have any work hardening properties?


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