On Friday 02 December 2016 23:01:05 Jon Elson wrote: > On 12/02/2016 05:15 PM, Gene Heskett wrote: > > Greetings all; > > > > Hooking up the encoder so I could use it to calibrate speeds > > obtained, I am puzzled as can be. But let me put that pix up on my > > web page first. Got it, could be sharper but will do. > > > > Append "/lathe-stf/Encoder-installed.JPG" to the link in the sig. > > > > The curved alu piece as you can see has 3 trenches carved across the > > inside face, on a curve radius that matches the bull gear. > > > > And as you can see, looking at the top 2, one is dead centered over > > a tooth, and the next one ccw from the top, is dead centered over a > > valley between the teeth. > > Yup, I made the EXACT same error when I did mine. That is 180 degree > phasing, but quadrature requires NINETY degree phasing. So, with one > sensor right on the tooth, the other should be on the corner of the > tooth/valley. > > Jon
Yeah, sitting here after my baby has signed off for a few hours, I punched a few buttons on kcalc and wrote me up a tutorial I can use to fix this with the minimum amount of alu shavings on the vice. In order to not have yafu at doing this encoder right, I have discovered that 1. The width of the tooth of a 6" 60 tooth gear is pi*.1, or 0.314159265358979324" per full tooth. 2. Needed is a quadrature signal, so the center to center distance between ATS-667's is 0.314159265358979324, times .25 or .75, or 1.25, or 1.75, or 2.25 etc, etc, plus the width of the ATS-667 as a measurement between the outside edges of the adjacent pockets, and the ATS-667's are mounted against the outer edges, pushed as far apart as they can be while the uv hardening resin mounting them is setting. 3. The same principle applies if measureing the nearest edges, with the outside tongs of the caliper, thereby placeing them closer together. Start with the existing separation, subtract the width of the ATS-667, and move them closer together until one of these measurements is machinable w/o running into the adjacent pocket. 4. That table of measurements, without the width of the ATS-667 is: 0.078539816339744831" 0.235619449019234493" 0.392699081698724155" 0.549778714378213817" 0.706858347057703479" 0.863937979737193141" which should cover any practical separation. 5. Just remember, if measuring the outside separation, subtract the ATS-667's width to arrive at one of the above figures, or if measuring the inside separation, add the ATS-667's width to arrive at one of the above figures. Or one could add the width of the ATS-667 to one of the above figures to get the physical separation to machine the outer width to, or subtract the ATS-667's width from one of the above figures to arrive at the width of the separating wall to be machined. Just remember which wall of the pocket to push the ATS-667 against while the resin is being UV cured. That I believe will narrow the chances of YAFU when I try to fix it tomorrow. The embarrassing thing is that I measured that thing quite a few times before I started the spindle without seeing that mistaken assumption. But I am ecouraged to have a couple of you folks admit to the same mistake, ;) Wet noodles at 30 paces? 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
