Hi, It is indeed possible to use linear scales with emc. With backlash they do not tune as well as encoders on the ballscrew. If the ballscrews are very tight the performance should be excellent. Recently there was a proposal by someone on the list (JMK?) to use encoders on the ballscrew/servo motor for velocity and rough positioning and then use the linear scale to drive final position. AFIK there is no software at present to do implement this but it is certainly a cute idea.
Many years ago when I was just getting started with CNC I retrofitted a Cincinnati tracermill with servos and glass scales. It worked but because of backlash in the 0.003" region it was jerky in tuning. When I replaced the glass scales with encoders on the ballscrew then tuning became very smooth. One still has to be aware of the backlash and approach drilled holes, etc from a consistent direction but it will get the job done. HTH Dave On Jan 8, 2008, at 9:16 AM, Witek GB wrote: > I am a newbie to EMC2 but not to machining. I am thinking about > creating a CNC Mill with EMC2 however, my problem is with backlash > compensation. Is it possible to use DRO scales with EMC2 to have > the feed back that would allow you to know exactly the tool position? > > Thanks > > WGB > ---------------------------------------------------------------------- > --- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/ > marketplace_______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
