> > I have found this one accurate enough for my needs for manual set up > > where I move the axis, given the ACME lead screws on my machine. I > > have however ordered one of the verser ones (plus extra probes) since > > it also handles Z and appears to have a bit more 'flex' to deal with > > deceleration of the axis once the probe makes contact. > > > First time I've seen that one which I assume is xy only, but that's also > a quite decent price. They need to advertise where DDG picks it up.
The round part is 0.2" diameter. That dimension is programmed into my Shumatech DRO although for the center of a circle, for example it doesn't matter. I touch off in one direction and when the LED comes on zero the X on the Shumatech. Then jog over or use the MPG to move in the other direction until the LED comes on again. At this point FCN, 1, X-Axis buttons. Now the 0 position of the X is midway between the two edges. Move to that and do the same but FCN, 1, Y to set the Y axis and now I have the center of the circle. Assuming I have my backlash set perfectly... I believe the G38.x can be used for this but it requires those macros or chunks of G code to set everything. Hence my original question about probing. And of course I'd have to connect a wire from the probe to the LinuxCNC system since it can't look at the LED inside the probe. John But > I'm so used to a direct electrical contact now that I probably will > never go back to touch probes. You would laugh at my most used probe, > its a 3/4" rod of teflon, with a hole bored in the end to accept a piece > of 12 gauge copper wire which is glued in. A piece of stranded wire > about 14 gauge, is striped, divided into two, straddles the 12 ga wire > and is twisted at the far ends to get a grip and contact, drapped over > something on the head so it doesn't crawl down the wire when I start the > spindle. The 12 ga, while spinning, is a perfect circle of a size that > doesn't care as long as its circle is smaller than the hole whose > location I am probing for. The math in the 4 way probe routine returns > the exact center of the hole which then becomes the xy touch off point > with a .0002" max error plus the slop in the ball screws. > > Plenty close enough for the girls I go with at my age. :o) > > Take care John > > 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, 1940) > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
