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Peter Bell	11/10/2013 15:30:53
399 forum posts 167 photos	Hi, 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 walsh	11/10/2013 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 Bell	11/10/2013 18:46:18
399 forum posts 167 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? Thanks

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