On Wednesday 29 March 2017 07:40:00 Stuart Stevenson wrote: > Gentlemen, > > Thanks Gene - you have given me some things to think about and work > on. I will be working on this today. > > > another bit or two of information > > I have tried a differential mpg with slightly better results but still > with errors. > > Has anything changed to cause this as the config files are the same > ones running the machine for years. The only difference is the > LinuxCNC version. > That I can't answer Stuart, the raspbarry pi 3b is running Jessie. and the linuxcnc is the devel branch for 2.8-pre. And its the only machine I've put wheels on. Mainly the apron on TLM isn't big enough to carry wheels. For the bigger mill I just carry the keyboard to it, and the little mill's keyboard shelf is just above and to the right of its table with a sheet of lexan between them. TLM's keyboard is directly in front of it, with a sheet of light alu trying to keep swarf out of the keyboard, poor success though. :) I have a custom molded skin on TLM's keyboard but it sure makes it hard to type, needing 3x the keypush it does w/o the cover.
The wheel code is at least half of the hal code for the Sheldon, and I still have a ways to go because I have yet to mount and configure homeing switches. And, because of the plumbing across the right side of the saddle, I'd like to add a z limit if its about to hit the tailstock & that would bend up the plumbing. 3 pieces of 5/16" bore SS pipe carry the wiring from the cable chain on the rear, to all the stuff on the new apron panel. Intended at one time to be used as fuel line on a so-called stock car, but the neighbor got out of that and gave me the leftovers. So I intend to fab a bracket to hold a limit switch that will contact the base of the tailstock in time to save things from a doofus operator, aka me. :) In retrospect, I wish we had a counter directly driveable by the a/b signals from the wheel, but the updown module we have has separate upcount and downcount inputs, so I had to use a wcomp for direction detection, which feeds 2 and2's and feeds the on period of the a/b signals from a 3rd and2 so as to fabricate the separate up and downs drives. Works well when the button is pushed enabling it with more and2's, but what a rube goldberg pile of hal code just to do that alone! But w/o more wires in the cable, impossible to do away with. As a friend to whom I often quote, this stuff keeps me out of the bars, and his reply was that I do the craziest stuff to stay out of a bar. Anyway, check the jog-value to make sure its the right size in machine units, and the jog-counts to see if its one per felt detent, and it should Just Work(TM) If not, fix whichever is wrong. With the addf order being important, make sure the jog-enable isn't out of time so it misses a pulse on one end or the other. So thats 3 places that could mess with you. Good luck! > Thank you for your attention and comments. Cheers Stuart, 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
