On Wednesday, February 11, 2015 09:09:34 AM [email protected] wrote: > On Wed, 11 Feb 2015, Gregg Eshelman wrote: > > On 2/10/2015 3:48 PM, [email protected] wrote: > >> Has anyone tried something like an encoder on the lead screw of a > >> lathe, a stepper on the cross feed, and LinuxCNC to synchronize > >> them. Could be used for tapers, curves, etc. > > > > It's called Electronic Lead Screw. http://autoartisans.com/ELS/ It > > drives one stepper on the lead screw and uses a single point rotation > > sensor on the spindle. > > > > It does have the ability to connect an external stepper driver to run > > a motor on the cross slide to do tapers and other non-linear cuts. > > > > The main point of this setup is to use instead of a quick change > > gearbox for threading and power feeds, thus it doesn't need a > > powered cross slide to do threads and straight cuts. > > I have looked at ELS. What I am thinking is only a stepper on the cross > feed.
_IF_ you have an encoder on the spindle, then that synchronised motion control is already built into LinuxCNC... The stepper on the crossfeed is very handy too. :) Check the docs for the various modes G33.X can synchronize tool motions to spindle for threading, or if straight no taper, use g76. All you need is the encoder on the spindle so linuxcnc knows where the spindle is in its rotation. My home-made quadrature output encoder is 200 steps per rev, or 1.8 degrees accurate if perfectly made, probably a 2 degree accuracy in the real world. And it can track the spindle at 3+ grand using raw parport or probably to 30k revs if using a 5i25 like I am. Although my present spindle gearing limits that to around 1400 revs. At 30k revs, I think I or that lathe would druther be over in the next drainage. ;-) The beauty of all that is that if you need a 50 tpi adjuster "bolt" that fits a 3" diameter, similarly threaded hole, but only 1/8" long, it is just a few parameters on the G33.1 or G76 line of gcode. The machine Just Does It(TM). Your problem will be in getting it started into the hole without crossthreading. :( Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
