On Wednesday 18 March 2020 22:56:31 Gene Heskett wrote: > I disconnected the 3 signals from the spindle encoder leaving the > ground and 5 volts in place. To my great surprise, turning a tooth > still crashed it. Getting out my looking glass, I came to the > conclusion I had a boatload of hair sticking out of most of the solder > joints, raising the chances of something actually contacting something > it wasn't supposed to. Clipped it off, crashed the pi while > remounting the encoder. > > Humm, since the index is mounted opposite end active, and the 5 volts > to that ATS667 had to go thru a sot I had milled in the wall of its > mounting pocket, the solder joint stuck up enough to contact the bull > gear tooth on its way by, which was shorting the 5 volts for a > fraction of a second as it went by. Looking in various places I noted > that the endoder has a quadrature error output pin but that it has to > be enabled before is has any output. > > Peter: can it be setp'd true without screwing up its other functions?
PS: where can I find a man page describing how to program this stuff as programmed into a 7i90HD by one of the SPI variants? > So thats tomorrow, and I am hoping that the sign of the average will > tell Peter which way I need to move the A chip to reduce the error. > > Its likely to be a very noisy output as the variability can easily be > seen in the halscope. TBT, this bull gear has been nearly destroyed by > 80 years of having tons of overpressure when the backgear is engaged, > and its so common a condition its obvious the guy in charge of > adjusting that during final assembly had never been instructed on how > to do it properly. > > Anyone else with a Sheldon should put it in backgear and listen. > > If you are hearing or feeling a rumble, lift the lever toward > disengagement and listen for the rumble to go away, and the remaining > noise is much quieter and reminds you of a bell. Loosen the handle and > adjust the eccentric until it sounds like that when fully engaged. The > other dead giveaway is if any of the tooths flat tips are worn smooth. > If that condition exists, the teeth on the smaller of the 2 mating > gears are being pinched and bent at the root of the tooth and will > eventually break off from metal fatigue. > > I got lucky and have not busted a tooth yet, but several people on the > Sheldon list have not been so lucky. > > Cheers, Gene Heskett 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
