Gene - The parabole function may not work but I see the hyperbole button is working. :)
On Tue, Apr 23, 2013 at 10:57 AM, Gene Heskett <ghesk...@wdtv.com> wrote: > On Tuesday 23 April 2013 11:30:19 andy pugh did opine: > > > On 23 April 2013 15:57, Gene Heskett <ghesk...@wdtv.com> wrote: > > > The biggest confusion to me yet is that even though > > > the machine is in absolute movement mode, G2/3 moves are still made > > > relative to where it starts from, > > > > See G91.1 > > http://www.linuxcnc.org/docs/html/gcode/gcode.html#sec:G90_1-G91_1 > > I did look at that Andy, and did do one move successfully with G90.1 in > effect. But when I tried to do the next pass, cutting a little more off > incrementally, because it was all from only one side of the ellipse, it all > went to hell with the error message saying I wasn't off a thou, but 70+ > percent of the radii for a 3 thou change in the end point location. > > I finally gave up and went to the discouraged r mode, which worked > perfectly once I had figured out how to pre-calc the r parts. > > The I/J/K mode may be the preferred mode, but if not accurate out to about > 16 or 17 decimal places, it prefers to throw essentially meaningless errors > at you instead of carving metal, or even video screen pixels. > > What is the path tolerance thing, G64? In any event, it has no effect, you > can tell it to use a .5000" tolerance but you cannot get past the brick > wall that is the error checker for g2-3. Unless you are trying to carve a > new mirror for the Hubble, I see zero practical use for sub-angstrom level > accuracy checking. Besides, that would not be an arc, but parabola, > something I don't know that linuxcnc can do all as a canned function. > > Simply put, you cannot /see/ the error because it won't even draw it in the > backplot. > > Put even simpler, its a pain in the ass. The absolute worst, hands down by > a very wide margin, command to "get right" in linuxcnc. When you finally > make it work, you've got enough time in 12 lines of code out of 300 to have > bought lottery tickets and won $2, for only a $10,000 investment. Whoopy > Ding, I won! NOT... > > Cheers, Gene > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! > My views > <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> > Results are not typical. > A pen in the hand of this president is far more > dangerous than 200 million guns in the hands of > law-abiding citizens. > > > ------------------------------------------------------------------------------ > Try New Relic Now & We'll Send You this Cool Shirt > New Relic is the only SaaS-based application performance monitoring service > that delivers powerful full stack analytics. Optimize and monitor your > browser, app, & servers with just a few lines of code. Try New Relic > and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- dos centavos ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
