On Friday 01 March 2019 12:57:38 Stuart Stevenson wrote: That, Stuart, would be a waste of time until I get a shorter probe, and see about adjusting the eccentricity out of it. When its out of alignment a good 1/8", and the existing probe is 1.5" too long, thats got to be fixed first.
> Clamp a dowel pin to the table and probe the od. > > On Thu, Feb 28, 2019, 10:25 PM Gene Heskett <ghesk...@shentel.net> wrote: > > On Thursday 28 February 2019 21:03:49 Jon Elson wrote: > > > On 02/28/2019 05:04 PM, Frank Tkalcevic wrote: > > > > I have a cheap ebay $100 probe. I had doubts about the > > > > accuracy, so I perfomed a test probing a precision disc from all > > > > orientations. (The disc came from a 1"-2" micrometer - it is > > > > used to "zero" the micrometer). > > > > > > > > The results were pretty poor, with the error ranging from 0.3mm > > > > to 0.75mm. > > > > > > > > http://www.franksworkshop.com.au/wordpress/2019/03/01/touch-prob > > > >e-ac curacy/# results > > > > > > > >> I have no way to measure how good MY probe is. > > > > > > Yes, what I need is a standard for an inside mike. That > > > would make it pretty easy to test several directions without > > > moving anything. I did set it up by creating a program to > > > measure two sides of a gauge block, and dialing in the > > > "fudge factor" in the program to compensate for the apparent > > > probe ball diameter. Since the Blum probe needs the ball > > > deflected a fair bit to register, the computed diameter of > > > the ball is quite different from the actual measured size of > > > the ball. But, it seems to work pretty well. > > > > > > Jon > > > > Jon, have you considered setting a digital caliper to say .2500" and > > locking it, then clamping it down well enough it won't slip while > > you probe its gap. Maybe even mounting it on an upward faceing belt > > drive rotory table so all angles of the probe could be explored? > > Its not required that it be exactly .2500 inches, only that it was > > well zero'd before you started, and that you can read whatever it is > > once opened and locked. That would be the standard you are > > comparing the probe to. That ought to make us some smarter about > > probes. Backlash comp would need to be done first of course. > > > > > _______________________________________________ > > > Emc-developers mailing list > > > Emc-developers@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > > > 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 > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers 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
