Are you tapering the slots so the edges are perpendicular to the center? BTW, 60 slots with the subroutine is a piece of cake. If you can come up with the code to do one slot I can paste it in my subroutine and send it back.
John On 5/31/2012 11:46 AM, gene heskett wrote: > On Thursday, May 31, 2012 11:28:24 AM John Thornton did opine: > >> I'm sure fresh bearings would help the 15hp and it is a heavy duty TEFC >> motor. I might pull it apart today and order some new ones... >> >> I didn't measure the temperature of the 10hp and only ran a few minutes >> but I'll keep an eye on it. >> >> I didn't ask for taps on the transformer but it won't hurt to find out >> the price. Input taps for 220 and 240? > Since the existing autoformer has taps for 208, 220 and 240, I'd say an > extra at 220, so you could use it for a 220 to 240 step up, or conversely > swap primary& secondary& use it for a 240 to 220 step down would cover > the options nicely when combined with the autoformers own taps. > > The N terminal on the existing autoformer can then be taken back to neutral > in the service, thereby forcing the secondary side to become neutral > referenced. If this tranny comes with N connections on both windings, the > N connection on whatever winding is used for drive to the existing > autoformer could also be tied to this neutral run, but that would be more > for correctness than any real advantage since it's the N terminal of the > OEM autoformer that counts here. > > I'd check my copy of the NEC, but it's either grown legs or belonged to the > tv station. In any event its a '98 issue and could be obsolete. I haven't > stumbled over it in 3 or 4 years. > >> How is the encoder disk coming along? >> >> John >> >> On 5/31/2012 7:21 AM, gene heskett wrote: > So-so. I, took that printout out there yesterday, but being somewhat fam > with the old code, and having a supply of #58& #60 pcb drills, I massaged > that code for the smaller bits and tried to make a 60 slot encoder, then, > trying to get the exec time down (its about 2.75 hours with that small a > bit) I pushed too hard& broke the last #58, so I slowed down a bit more. > So I've broken about $35 worth of bits now to get one poorly cut disk. I > added a duty cycle fudge value where the original code just divided by 2.0. > > Since mulls are faster, the disk I made yesterday now has a mull by > duty_cycle, with duty cycle at .45. Next one will be at .40 to equalize > the opto outputs to 50%, they were about 57/43 when I put it on the lathe. > > I have the A/B slot ring about correct if I reduce the duty cycle from .45 > to .40, I should get pretty close to a 50% duty cycle out of the opto > devices. I can bend them back and forth perhaps 10 thou to fine tune the > quadrature timing, or adjust the slot count one way or the other by one > count. But I think I am going to have to dig another 5 thou deeper into > the piece of oil soaked oak used for sacrificial in order to remove the > last vestiges of the fact that its not an end mill, but a drill bit with > fairly steep angles. It left a fin at the bottom of the slot. > > Going from 39 to 60 slots, I had to adjust the encoder's scale& negate it > but that was half expected. And I have too much gain, the speed is hunting > about 10%. > > Then, I am going to have to separate the slot cutting and inner hole cutout > from each other in the codes looping so this thinner stuff has less > opportunity to flex, and after fighting with the index slot, trying to > maintain its tapered shape, it occurred to me that a simple slot perhaps a > thou wider than the bit itself is all that needs since I don't think it > needs a specific timeing reference the A/B slot ring. So that is the next > change for this code. The .001 off line movement there is about the limit > of my mill, but would be intended to assure that only one edge of the drill > is doing the cutting. When both edges cut, the cut isn't as clean as the > bit flexes. I ordered another 5 pack of each bit size yesterday. $89. > > Another thing that I question is the math that does the tapering of the > slots, I have a feeling its not quite right, but cannot put my finger on > it. That is about a screen full of code in vim all by itself just to make > the 5 moves that carve the slot at each depth increment, and the last > movement should be to the origin of the end of the first movement, but > there is a small gap when you zoom in the backplot to look at slot 0 and > the index or to any individual slot. The error is at least consistent > though so should be fixable. > > I haven't started on that yet for today, I need to make a trip out to get > some blood pressure& anti-sugar pills& some groceries first. And since > the temps are decent, I need to fire up the weed eater& finish trimming my > jungle too. And when I do get to the shop, from the looks of things in the > mills head, I need to replace one of those plastic gears, a hub is starting > to break out and the gear rim is flopping up& down about 1/16" with > attendant rattling noises. There was, 10 years ago, a belt drive kit for > this thing that gave a max rpm of 5000 but that was discoed several years > ago. Damnit... > > If they ever get my nose cleaned up for good, I'd like to get a G0704& a > ball screw kit for it, it would *2 my xy envelope. Z I have lots of thanks > to the all new Z drive I built several years ago. > > That old saw about wishes, horses and beggars comes to mind. Dreaming is of > course free. :) > > Thanks John. > > Cheers, Gene ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. 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