On Tuesday 28 June 2016 19:34:50 andy pugh wrote: > On 29 June 2016 at 00:25, Gene Heskett <ghesk...@shentel.net> wrote: > > I've read the quite limited description in the wiki, but see no way > > to effect an X move dependent on the Z position. > > > > Is there any hope of doing this? > > lincurve and offset
Lincurve I am familiar with to a limited extent, tried to use it to linearize spindle speeds vs issued command, failing to get usable reslts. Problem turned out to be in the single quadrant driver, and was 99% eliminated by switching to a Pico PWMServo amplifier to drive the spindle. IIRC it can only do 16 individul points per module of it loaded. And the man page doesn't state if it can be expanded. Obviously the answer is yes, up to 144 points with a mux16 selecting which of the 16 lincurves to take the output from, but the logic to drive the select lines will get hairy. As will the hal file to build all that. OTOH, maybe 16 points would be enough considering that the H frame carriage has a footprint on the ways of about a foot wide, the needed correction needen't be that fine grained because it is not going to tip that much in 4" of motion. So when stuff shows up and I can make swarf, I should concentrate on the crossfeed handle/shaft to screw mating as this ball screw is a few thou smaller than the 3/8" nose of the old screw, and the old screw is slotted for a drive pin to couple the handle to the screw, while the tapering jig is telescoping that 3/8" shaft in and out of the handle. And ingenious way to do it, IF the taper clamp bolt worked to solidly lock the taper jig to the back end of the crossfeed, which it doesn't, and the drive clutch in the apron worked, but its very easily made to slip. The rear end clamp might work if its bottom face was lapped flat, but its not even up to the std of a 4" piece of hot rolled bar out of the metal bin at TSC Obviously a shop made piece, not the OEM by any definition. So I'll keep the lincurve + offset solution in mind as it can fix at least 95% of any errors. Thanks for making me think Andy. 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> ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
