On Saturday, February 25, 2012 03:59:53 PM Jon Elson did opine: > gene heskett wrote: > > So I played with the code a little more and made another wheel > > yesterday, then carved up a bracket to hold the pcb & got it mounted, > > but I think the scope pix I took is too big to pass muster at the > > server. The wheel wound up with only 39 slots because that was about > > the best quadrature timing I could get at the allowed diameter. That > > still gives a 2.25 degree resolution. Shrinking that pix much below > > 185k and the jpeg artifacts get plumb fugly. > > > > It seems that when I switched from the hobby shop brass, to a slice > > off the end of a brass door kickplate, the brass got easier to > > machine. Same .032" thickness. > > Looks like you GOT IT! The quadrature looks clean and 90 degrees, > and 50% duty cycle. > > Jon
That was the point I think. ;-) There is one longer logic one pulse, I believe because if you look very carefully at the disk scan, the index slot which joins the inner end of the A/B slots, is about 2 thou wider & extends outward into the A/B slot real estate just enough that at least one of my opto's is seeing it, so the logic 1 state is stretched about 1/4" on the trace. Just sort of flickers along on the bottom trace. But if I shift that end of the assembly outwards 10 thou, I start getting A/B noise in the index signal. I think there is enough of this project on my web page now at <http://coyoteden.dyndns-free.com:85/gene/Genes-os9-stf/eagle> to cut your own if so inclined. I added a pair of via's adjacent to the G & 5 pads to mount a small tantalum bypass cap, but its looking like 7 feet or so of 4 wire flat cable may have a skosh too much signal edge crosstalk so I might have to wire it with a bundle of cheap audio cable for shielding when I put it to real use. But if the creek don't get too high, we'll get there. I've been trolling utube for ideas on where to put the motors on this toy. I may wind up tossing the backsplash shield and putting the Y motor on the rear, or jacking it up a couple inches on the pan and hanging to so it moves back and forth under the bed & ways casting. I have motors, but most are triple stack 425 oz/in=heavy. Next down on the shelf is a bag of those 52 oz/in that H&R did sell, but I've no clue what amperage they would need. What they have now ranges from .5 amp to 1.9 amp in that torgue range. I have no clue if they would run the Y slide under load when geared 1/1. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Humor in the Court: Q: Are you qualified to give a urine sample? A: Yes, I have been since early childhood. ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
