On Saturday 02 March 2019 12:09:53 Stuart Stevenson wrote: > I think I would dial in a hole or a boss with a test indicator. Write > down the xy coordinates. Run a probe routine to determine where the > probe says the hole/boss is. Calculate the error. Write the error on a > sticky pad. Stick the sticky pad on the control face and use those > values to set xy when you probe a feature on a part. You would only > needing orient the probe the same way each time. Then the error > between the probe tip and the spindle center line would not be > important. > Maybe I haven't followed your discussion accurately but if you would > have a problem with the wires using Ken's procedure how would you > handle spinning the spindle at 100 rpm or more? > Thanks > Stuart
Actual electrical contact between the spinning wire and the part. For my g0704, the wire is a 2" piece of 14 ga romex conductor, mounted in a 3/4" plug of teflon with a contacting stranded wire split in half and twisted together on the other side of the 14 ga. Workpiece is grounded, or for tlo measurements, reverse the wiring and touch a piece of pcb with the grounded tool. For the now failed HF mill, the brass tubing was the hot contact and the sewing machine threader wire was mounted in the grounded spindle. But theres so much epoxy paint on this 6040 that the spindle isn't grounded, 200 ohms or more. So I'm forced to find a different method. Which is why I'm waiting for Ken to post pix of his 180 degree locking method. Because the body of this thing is so far away from anything fixed to the motor, my imagination keeps coming up with nearly impossible to build solutions. A wrench on the double d flats is way too sloppy for instance as it would allow at least 5 degrees of slop. Some method of driving a flat bar against one side of the double d flats might work, but I don't want to add a lot of weight, the z motor is being pushed pretty hard already. That and I wasn't able to find a shorter ball probe that I was sure would fit this POS last night on ebay. Might have to make one on the sheldon now that I have well aligned collets for it. Or even TLM, probably with a grinder. But the threads will take brow-beating g76 into running bass ackwards to cut the threads on the probe w/o having to reverse it in the chuck. Thats a trick I've not taught it yet. Whatever I come up with will likely have to be clamped to the motor, and spaced down around 3/4" to get it below the slinger flange on the rear of the er11 collet as the flat is actually on the collet, not the motor shaft. And thats all weight. Then I need to figure out how to get this POS back out of the collet, its frozen into it, loose in the nut ATM. And I only have 1 more nut, on another motor that came with the vfd I'm running the Sheldon with. Them ER11 collets are tiny. And I'd better get to it. 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-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
