I had to cut down a stepper motor shaft from 1/2" to a little less than 3/8" to fit an encoder. The motor had 1/2" shafts on both ends. The motor was a nema 34 with flying leads. I taped the leads to the body of the motor. I chucked the 1/2" shaft I did not want to machine in the 3 jaw chuck. I supported the other end of the shaft with a live center and used a very narrow tool (modified cutoff) to turn down the shaft at the live center end. It worked fine. The motor case spun a little with the shaft but I could have used some tape to keep it from rotating.
The other thing I thought about afterwards was using the motor itself to power the shaft that is being turned down. Clamp the servo motor to the ways and run the carriage and tooling up the the motor shaft while the motor spins via its own drive. If you just want to cut the shaft off, putting a hacksaw against a spinning shaft will make quick work of it. Dave On 9/7/2015 6:09 AM, andy pugh wrote: > I have a motor that would be about right for my lathe conversion, if > it didn't have a brake on the back. (a nice short motor is useful for > a Lathe X axis). > > I am considering re-machining the rotor shaft and the end cover to > make it into a shorter motor without a brake. > > The problem, clearly, will be that all the swarf will want to stick to > the magnet. My idea is to wrap it in masking tape and then duct tape, > do the machining, add another layer of duct-tape to immobilise any > remaining swarf, then cut it all off. > > Does anyone have a better idea? > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
