On Tuesday 13 October 2015 13:56:41 Billy Huddleston wrote: > I've got to ask.. What exactly is this and what is it for? > > http://geneslinuxbox.net:6309/gene/GO704-pix/gauge-drive-sliding-coupl >ing.jpg > > ??
Shade tree engineering, a long and proud history for an old Iowa farm kid like me. Reason? The frame of that, salvaged from an old paper shredder, precludes putting the axis of that gear dead inline with the piano hinge the locator bar swings on. And because I have a strong o-ring across a couple screws on the back of the hinge, pulling the end play out of the hinge with about ba 10 lb pull, I found that 2 things were happening. 1, the plastic hose was pushing against o-rings pull and screwing up the repeatability of the x asis detection. Or 2, it was pulling itself off the gear when the jig was open. So I milled a piece of 1/2" copper pipe about 3/4" long with 8 slots at 45 degree intervals, making the slots about 90 thou wide & .3" deep, as close as I can get to the 3 jaw on my cheap rotary table without the side of the spindle dragging on a chuck jaw. Then bent them inward to engage the gullys of the 8 tooth gear. It freely slides endways on the gear as it opens and closes the locator bar. Tied via hal to the "mist" button on the left panel of the axis gui I use, feeding the 5i25's P2 pin 17. By the same token, a charge pump is running at 1/2 servo-thread rate, and the "flood" checkbox enables it via an and2 to drive a pump detector, watching the 5i25's P2-pin 16, which in turn turns on a transistor and that pulls in a DPDT icecube relay wired in parallel to start and stop the vacuum. The added complexity of using the and2 in the hal file allows me to add more stuff to the mix. But I haven't figured out how to get it to select a good board off the pile, take it over to the chop saw, cut it to length, and bring it back & mount it on the mill. Yet... ;-] First off, no robot I've seen walking around could negotiate that packrat built midden heap I loosely call a garage. :-[ > On 10/13/2015 09:25 AM, Gene Heskett wrote: > > On Tuesday 13 October 2015 06:43:51 John Thornton wrote: > >> You must be a fan of Rube Goldberg! I love the gauge thingy... not > >> being an electronics genius like you I would have drilled the > >> bottom of the holding thingy for some pins that fit the slots in > >> the table to register the fixture in the Y axis > > > > I glued some legs on the ends that fit the T slots. I miss set them, > > probably moved on the glue film when I tightened the screw so the > > runout in the x direction is about 3 thou. They also fit the T-slot > > too tight so it should be fixable. I just need to find my round > > tuit. But I'd have to put a dial on the head and sweep the x, > > measuring the closed bar, to figure out which leg to sand on. Until > > then, its close enough for wood. > > > >> then put a dowel in the spindle and > >> move to - half the dowel diameter and slide the fixture up to the > >> dowel. Then I would make a template like a L with pin holes and put > >> that into the fixture and slide the part up to the L to set the X > >> and Y of the part the same place every time. The remove the setup > >> guide and machine away. But your way looks more fun. > > > > The x stopper is on the left, about 3/8" high, screwed and glued, so > > it doesn't move. The end of it adjacent to a finger on the board > > has of course been machined away by the mill coming down the side of > > the board, shaving it a thou or so. But I felt I had to make it > > gcode controllable as I was losing track of the number of times I > > had to reach over an flip it manually to keep the bar from being > > carved up as the head was descending. Walking to the far side of > > the machine and bending over to turn on the vacuum was also a PIMB*. > > :( > > > > Because this machine is more rigid, I've had to adjust the mills > > diameter in the software to re-establish the glue line fit. Or this > > mill has less x backlash that the small one with its teeny ball > > screws. Needs bigger balls in the x screw, its about 1.6 thou. On > > the small mill, I had to tell the software the mill was only .243 in > > diameter, effectively making it cut deeper. On this one the same > > glue fit is around .247" > > > > Anyway, the target is to set and clamp the board, sit down and hit r > > until its time to change the tool or turn the board over. Rinse & > > repeat for the other end of the board, then get some exercise > > cutting the next board. And because the roundover bit is about 3/4" > > shorter than the mill, I either need to fit collars to both bits, or > > buy another R8-ER20 adaptor so the whole thing gets changed when its > > tool changing time and I can know the stickout difference. > > Presently I have to probe both tools. > > > > In either case, my spindle pin brake needs something to hold it in > > while my hand is busy catching the tool or adapter. I made it with a > > retractor spring as its not nice on things to try & start the > > spindle when its locked. > > > > *PIMB pain in my back. > > > > Thanks John. > > > > 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
