On Tuesday 10 March 2020 20:03:53 Gene Heskett wrote: > On Monday 09 March 2020 22:55:55 Gene Heskett wrote: > > On Monday 17 February 2020 18:08:11 Gene Heskett wrote: > > > On Monday 17 February 2020 16:57:36 Les Newell wrote: > > > > They should be any multiple of the tooth spacing plus half a > > > > tooth spacing. > > > > > > > > Your tooth spacing (pi x diameter) / number of teeth = 0.314" > > > > > > > > So the available spacings between the sensor are: > > > > > > > > (0.314 x 0) + (0.314 / 2) = 0.157 > > > > > > > > (0.314 x 1) + (0.314 / 2) = 0.471 > > > > I have the final ATS667 in the process of glueing with as close to > > .471" from left side to left side, should be as close as I'm going > > to get it w/o actually making it movable. Now if the 5 pin plug > > doesn't hit the head cover casting, (or vice versa) it should at > > least be usable. Flat top cover, so I might get away with it. :)
That ATS667 broke off its signal lead right at the body while trying to get air around all the leads, so I have the last one glueing up ATM. So while that was cureing I got out a 100 ft coil of 24 ga wire and hooked it up to my new scope. And ran the spindle at about 600 rpms, or 10 rps. That coil of wire picks up all kinds of crap from the vfd, and probably from the motors which come on with the vfd. There is absolutely zero sign of any low frequency output from the gears rotation at 10 rps when the gain is cranked. That leaves wear of the gear teeth, caused by the tons of engagement overpressure while the back gear was engaged for the 80 year history of this machine, causeing a tooth to tooth variation in the flatness of the top of the tooth, and my spaceing is a full tooth+ at a target of the .471, so one hall is seeing tooth 1 while the other is seeing tooth two. And if theres a difference from tooth to tooth, its a huge quadrature error. And I can easily see the tooth to tooth shape diffs. One is flat and still has the machined finish across the top of the flat tip, where the next adjacent tooth is polished and worn rounded, effectively narrowing the top of the tooth by a couple thou or more. I have considered rigging my die grinder so it ticks the tops of the taller teeth but that would fill the head with stone debris, so it looks like I lift the B signal 667, place it on a brass sheet, and mill mounting slots in the sheet so it can be adjusted by 20 thou with a 0-80 flathead screw. Milling out that 10 thou behind the brass sheet. > That looks like it will work, almost. BUT I made a witness mark to > space the index sensor out from the gear and directly over the path of > the extra ferrous gizmo glued to the back face of the bull gear. oops, > sees the gear too! Had to chisel it loose and have it glueing again > about 1/8" farther from the gear. And I think I am going to have to > demagnetize the gear which measures at about .001" max eccentricity, > but is many times worse than that magnetically, Quadrature edge out of > time failures are screwing with the tach. > > > Should be testable tomorrow. Cooking/curing under heat ATM. > > > > > > and so on... > > > > > > I think my existing bracket can do the latter spaceing, thanks > > > Les. > > > > > > > You won't get a perfect quadrature but it should be good enough. > > If I can get the gear demagnetized. Doesn't seem to be. So that excuse is off the table. This whole assembly is a one screw mount and the spacing seems to have widened about a mm but thats a single light stroke of a sharp file to fix so thats next to try. But at the same time I am about out of patience. Anything involving jbweld means another day to cure with a heater blowing on it. Anybody have any patience to spare? :-[ Thanks all. 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
