On Thursday 07 January 2021 21:33:08 Gene Heskett wrote: > On Thursday 07 January 2021 18:56:31 Gene Heskett wrote: > > On Thursday 07 January 2021 17:54:51 Jon Elson wrote: > > > On 01/07/2021 02:24 PM, Gene Heskett wrote: > > > > copy pasted from the anderswallin site it had a bunch of python > > > > stuff in the paste that didn't show in the onscreen box, so I > > > > removed it. Whats left is attached. > > > > > > This is an HTML corruption , > > > > > > in<0.0 > > > > > > should probably be replaced by in < 0.0 > > > > And that did it. Thanks Jon. > > > > Now I am wondering what a good starter for amount might be. Current > > miss is from .1 degrees to about .175 degrees short of hitting dead > > on. But I've no clue if its scaled. > > And apparently it is scaled, a lot. An amount >80.0 may or may not > oscillate, but 80.0 gets me to x.99xx of where I sent it, but it now > needs a wider zero point in order to stop tickling the motor once its > reached a friction locked point within a hundredth of a degree. So I > may see if I can add a new deadband parameter so it treats anything > within the deadband as zero out. As is, it is getting quite a bit > closer to where I sent it. > > Sent to 180, it goes to 180.0000, but sent to -180 with an amount of > 40 for a stable stop, it goes to 179.9985 degrees. I may be wearing in > the bs-1's worm as the amount before it oscillates at stop is > dropping. > > That seems like it ought to be good enough for the girls I go with. Is > it? > One last thing I would like to do, is output a zero to the pwmgen if the error is less that a tolerance thereby shutting down the motor entirely. I can do that using a near and a mux2, however, from reading the near man page, it appears it is not symmetrical about zero. And with two worms in series the motor may as well be welded. It isn't going anywhere.
So to get that response, one would have to scale one input by a small amount, and setp "near" to nominally 2x that scale in order to get s symmetrical response window centered on zero. If this is the case, it also explains the difficulty's I've had getting a really good spindle-at-speed signal. So I wind up playing 10k monkeys until it sorta works. Or I could modify idb.comp to do that. Then I would be assured of symmetrical response. But its been 20 years since I written any C and I'd have to brush up. Thanks everybody. 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
