Rich Amaral wrote: > Hey guys, > > This is purely a machining question. > > I'm currently retrofitting the lead screws on my home built cnc router > with ACME thread screws. Yes, I run EMC2. The screws are about 3 feet > long by 3/8 in and need to be turned a bit at either end to fit the > stepper motor coupling and bearing (at the other end). > > I have a Craftsman professional lathe (much like an Atlas) in decent > shape. After turning both ends to size, I discovered the screw became > warped (about 37 thousandths, a noticeable amount). I don't think the > screw was warped before, although I'm not 100% sure. That leaves me > and the way I held the screw in the lathe (I think). > How fast did you spin the screw in the lathe? A 3 foot bar 3/8" in diameter will easily develop "whip" when spun. You need to support it every 6" to a foot, or turn VERY slowly, like 100 RPM if you leave the back end unsupported.
Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
