On Tuesday 04 February 2020 06:57:54 andy pugh wrote: > Does anyone have a G-code routine to probe around a profile to trace > it out? > > I imagine some sort of "keep turning right" algorithm should be able > to walk round a profile, though exactly how you compensate for probe > diameter on external corners has me a bit stumped.
A reasonably accurate measurement would be to subtract the probes tip radii when the last samples are a straight line and when arriving at a corner do the subtractions using sin and cos of the new readings, scaling the radii accordingly. The problem there is how far does the probe move to open the contacts. Probably done more accurately with a camera with only 4 pixels unless you have a very sensitive probe. I think I'd druther use a contact probe as it would have less flex. A bit of wobble would make contact and lose it, allowing the angle of the surface to be detected well enough to steer the contact search. but would limit the rpm and search speeds, to the point of impractical time wise. It could be done, but might take 3 weeks. I once scanned the floor plate of my P-17 to a 20 thou grid, looked pretty good but took nearly 2 weeks and was only one side of it. I had visions of making a alu version. I also had contact reliability problems be cause of the parkerized finish in it. Gave up. I very briefly considered takeing the profile of the new SS 6.5 barrel I was about to put on old meat in the pot, then sanding it down to about half ifs weight and rewraping it in carbon fiber to about the same profile, but the cost of the fiber and the resin's environmental aspects brought me to my senses, not to mention the time for the invention of the tool post to apply the resin and wind the fiber in a nice artistic x pattern. Nice idea on the face of it, but I'd have had 5x its $650 cost in it by the time I was ready to put it in the barrel vice and screw it in. It shoots well but that SS is heavy, too heavy for carrying around in the deer woods at my age. To/from a well placed and camo'd blind might be doable though. Finding a place to put that blind is another project entirely. 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-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
