On Tuesday 26 November 2019 13:59:39 andy pugh wrote: > On Tue, 26 Nov 2019 at 16:42, Gene Heskett <ghesk...@shentel.net> > wrote: > > My lathe can probably make a decent starter square as I've measured > the
This was using a knife edge being moved in and out of the beam with x as z was brought forward, detector cell sitting centered on the tip of an mt3 in the tail stock barrel. Spindle turning slow enough it could follow the wibbles as the laser turned I called it aligned when the tailstock carrying the detector read within a thou an inch from the chuck to flush with the end of the bed. Then I corrected the errors over that 30 some inch range. I didn't get any closer to the chuck because the force of crushing the left bellows was starting to lift the carriage. I need to, if I can, move the nuts anchor on the rear of the apron at least an inch to the right, or make tapered gibs. Thats a great idea, but a long project based on what it took to do TLM, something I'll wait till I've laid my lady away and have more time to do it. Like make a real annealing furnace/oven. Turning a perfect cylinder has too many variables, such as flex in the spindle because the far end is unsupported. So you turn it, map it, and then start running a .0001" dial up and down it, subtracting the mapped error. Repeat for the opposite side of the cylinder. Then and only then do you have a diff that is the out of plumb. > > bed wear with a laser sighter and corrected that. > > I think that you have missed my point. > > 1) Machine something that ought to be a perfect cylinder. > 2) Measure the actual diameter every half-inch. > 3) Use those numbers in your correction curve. > 4) Check that the lathe now makes a perfect cylinder. I'd expect a better cylinder, but not perfect on a .0001" dial. 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis 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
