On Fri, Jun 05, 2009 at 11:52:55AM -0500, Jon Elson wrote: > Erik Christiansen wrote: > > Ah, it's off with the quill feed pinion, capstan, and fine feed worm > > then, unless milling the 3 bolt holes to slots will allow the pinion to > > slip into pefect mesh with the rack on the quill. > > That will only move one side of the pinion, leaving it crooked. > Anyway, these racks were never made to eliminate cyclical error, which > could be pretty large. So, you need to get rid of the rack. See > http://pico-systems.com/zaxis.html for some pics and description of > how I did it.
Oh - Oh, I didn't check that. EMC's leadscrew compensation might help with cyclical error, but I'd have to make up a sliding bearing mount for that side. A short ballscrew would be more work, but provide a predictable improvement. It would also leave the machine usable as-is, right up to the swap-over. Or, if those ballscrews do wear out overnight unless aligned with super-duper accuracy, then I'll have to price this thing: http://www.nexengroup.com/rp/?gclid=CJ28i_728poCFdEtpAodG3lDeg It would be a bit of a pig to build onto the side of the spindle housing. Ideally it should go into a slot in the quill, cut along the axis of the rack. (Hmmm, Kirk's right. I do need another milling machine. :-) > > > > There's then room to fit a vertical ballscrew, clamped externally > > to the quill nose. > > No, I would not do that. It will be very hard to make this rigid. A > friend has a benchtop mill with that rig, and it is very flexible. > That's why I did it from the stop ring bolt hole. Hmmm, my quill lacks a stop ring. There's just the last 2" length widening from 3.5" to 3.75", then the INT30 socket and dogs below that. I was thinking of boring out a piece of 1" thick steel plate to 3.75", to make the clamp. The rest seems to mimic what you've aleady done, just at the side, because that's closer to the quill, once the pinion drive is removed. The quill nose can best be seen after scrolling down to the second lot of pictures at: https://www.machineryhouse.com.au/Products?stockCode=M161 This is just like software development. Time spent working through the wrinkles before you cut [code|metal] pays off one hundredfold. Erik -- Anyone who has had a bull by the tail knows five or six more things than someone who hasn't. -- Mark Twain ------------------------------------------------------------------------------ OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
