On Monday 24 August 2015 15:26:25 andy pugh wrote: > On 24 August 2015 at 19:42, Gene Heskett <[email protected]> wrote: > > Yes Andy, I can g38.2 the 4 "corners" of a hole, and calculate the > > center, sometimes repeating, the first moves as a third after the > > 2nd has left it centered in that plane, and get a far more accurate > > center location without exercising the calculator buttons. > > There is a sample G-code file that does that already. > see probe-hole.ngc in the "Examples" in nc-files. > I use that, which finishes the moves with the machine at the centre of > the circle, then I touch-off X and Y to zero there.
And it zeroed me about .55 mm to the right of center. I caught it before it did too much damage though. But I did get things trimmed so it was moderatly well centered, then bored it from 8mm to about 8.98mm. Then spent the next 2 hours trimming on the *^%$ key, which of course was too tall, had to take off most of a mm there, then clean up the sides as it was still a red one too wide for the remains of the slot in the hub. Just enough to clean up the sides was enough, but to fit the shaft, I could have bored it out another .08mm. Its about half driven in place now, but all the superglue that was locating the shaft endwise has broken loose, so I'll have to find a good block of iron to back that up while I drive it the rest of the way. So I'll have to finish changing the headstock which means the motor will have to be reinstalled to get the pulley aligned, then removed again to gain access to laying another layer of superglue on the shaft/bearing hub joints. Not my idea of fun. Then while the superglue is setting, drill & tap a hole in the bearing carrier right above the bearing adjacent to the pulley, and install a small hex headed bolt so it will, if properly adjusted, brace the bearing carrier against the bottom of the bed. Not at all accessible when the motor & jackshaft are installed, but I'll figure out something. The idea is to maintain tension on the belt by preventing its rising and slackening even when that 1 horse is soaking up 10 amps worth of the Good Gulf. The OEM motor mount, which I used to mount the jackshaft and adjust it, simply is not up to the job when there is 1000+ % of the torque the OEM 400 watt motor could supply now available. I need to survey how much room there is around the head of this added bolt, perhaps I could weld on a bigger star style lockwasher, to the bottom of the head, which I can probably reach thru the wireing access hole in the front of the bed, and drive it one way or the other with a screwdriver & hammer. But the next thing I have to do is saw about 3/4ths of the short leg of a 6mm allen wrench off so I can get to the 2nd and 3rd bolts in the front of the bed. My z screw is in the way. Its removeable, but quite a few bolts to take out. That might even be easier than sawing off a decent steel allen wrench. But tomorrow I go get a couple more cortisone saddle blocks put in my back & that will waste a decent sized piece of the day. So I have some more time to plot my revenge against this POS. Progress? Bah. PITA, yep. Worst case of BBLB I've ever seen, except perhaps a 2002 VW Jetta we owned for about 18 months. That 18 months cost the dealer and I nearly 6k dollars over and above the check I wrote for it, and it sat in the shop waiting for parts a couple times, once about 6 weeks. Obviously I don't even allow a VW to park in front of the house now, it might be contageous. :) Thanks Andy. 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
