On Sunday 26 July 2015 23:31:32 Brian wrote: > I have had an idea lingering in my head for quite some time now. How > about moving the screw/backlash comp out of motion and implement it > with a HAL module. The purpose would be for two goals. One it would > make it more logical to implement more sophisticated joint > compensation, such as thermal expansion, deflection, and belt stretch. > Second, it would set the stage to be more friendly for dual > scale/motor feedback, because it would give control over where the > compensation is added in the feedback loop. > > Is this something anybody has thought about? If it seems like > something that would be useful, I'll start a branch and work it out. > > Brian
It does sound useful, Brian, particularly for thermal expansion as a mills z axis heats up. If a sensor can measure the quill temp, and cause a corresponding compensating rise, I could do pcb etching without over digging at the end of the job because the spindle has thermally grown 3 thousandths. I can control it now only if I have lots of fans blowing on the machine to carry away the heat. 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
