Erik Christiansen wrote: > On Fri, Jul 02, 2010 at 08:47:29PM -0500, Jon Elson wrote: > >> I put an encoder on the end of the ballscrew with a helical-slit coupling. >> You can see some photos here : >> http://jelinux.pico-systems.com/CNCconv.html >> > > Hey, that sounds a bit easier than making Oldham couplings. > About how many turns of helix did you use? > You can buy these commercially. I do not make them. A wire EDM seems like the simplest way to make such a part, but I don't have such a machine. I think they usually have 3 slits, like a multi-start thread. >> Please excuse the awful pictures, I ought to redo them. >> > > Somewhat higher resolution would help anyone taking a keen interest in > details. If the coupling is visible from some angle, there's an > appreciative audience of at least one for an image of it. ;-) > Just look up helical slit coupling on Google, you should find rafts of pictures. SDP and W.M. Berg sell these and should have all sorts of pics and engineering data.
The awful pics were color snapshots made with silver film and then scanned in on a color document scanner. I did this a decade ago when the machine was built. Someday I'll redo them with the digital camera I now use. Jon ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
