On Saturday 25 November 2017 11:48:32 andy pugh wrote: > On 25 November 2017 at 16:19, Gene Heskett <ghesk...@shentel.net> wrote: > > Got that running, using rawcounts, but I am not getting an integer > > number for an answer. 14,095.11 for low gear. And 7,161.26 for high > > gear. > > How many counts per rev on the encoder? > 1000 line encoder, but that shouldn't matter if its index is not used. The figures quoted above are the rawcounts recorded per full turn of the spindle. The output of the sum2 used as a subtractor were 100x that because I had 100 turns difference in the comp trip points.
> You do need to factor that in. > > And gear ratios are typically _not_ integers as designers like to put > in a "hunting tooth" > > So, a 2:1 gear might be nominally 50:100 but would be designed as > 51:100 = 1.961:1 So as to wear more equally by polishing away the machine marks on the tooth thats 2 microns wider than the rest. :) If a given gear advances one tooth per revolution against its mateing gear, then that wide tooth will wear to equality long before its worn out. And rather than spending all that time ripping out the opto's, I just ordered 2 of those SainSmart boards I posted the link to from amazon. s/b here Monday. 2 of them is still less sheckles than a single 7i75. The main problem I think is that the offset of the db25 connector is reversed so I'll have to move one end of the dsub cutout in the box. NBD other than cleaning up the debris. Wish I had a greenlee punch for that though. :( OTOH, gives my legs time to heal, diabetes starves the muscles and I had a hell of a time with leg cramps last night. I'll find out today, if the psu for the nema 23 motors can feed another driver/motor yet today, and if it can, get the A axis wired up and working. But first, go feed Dee some lunch. Thanks 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
