On Saturday, February 04, 2012 05:45:48 PM Kenneth Lerman did opine: > On 2/4/2012 3:08 PM, dave wrote: > > On Sat, 4 Feb 2012 12:21:16 -0500 > > > > Przemek Klosowski<przemek.klosow...@gmail.com> wrote: > >> On Sat, Feb 4, 2012 at 12:11 PM, Erik Friesen<e...@aercon.net> wrote: > >>> Make two programs, with the second program zeroing on the last hole > >>> of the first. > >>> > >> On Sat, Feb 4, 2012 at 12:16 PM I wrote > >>> > >>> In any case, I would write two CNC programs, one for each half of > >>> the holes, in such a way that the home position for the second half > >>> would be the last hole of the first half. > > > > I end up doing this all the time since my current small mill is > > limited to 16" X travel. However I define Y with respect to the upper > > jaw of the vise so all I have to do is slide the part in x to get the > > dowel pin aligned. > > I'll bet that Stuart does it all the time, too. His table is limited to > 16 feet in X travel. :-) > > Ken
Chuckle. But after writing that Ken, I think I'd want to check my tongue for bite marks. ;-) What is even more embarrassing to me is that it is probably more accurate anywhere in that 16 feet than my little screw and stepper driven toy is in any one inch! Call me jealous. OTOH I don't have a flooring slab on the property that would hold that machine level for an hour. Reality sometimes sucks. OTOH I played with the backlash comp etc last night, then reran pcb-gcode for an only 2 pass isolation, and on a top board that was almost usable but cut a bit deep, applied the corrections to the x axis from the MDI screen, and ran the bottom.etch. I had to restart as the depth I got by setting it up 0.0005 from a G38.2 contact and running the raw file, I didn't get a dark bottom of the first cut so I stopped it, did a run to z0.000 and added a G92 Z0.0002 & restarted it. Work of art, might even be usable if the drill holes were finished. This sort of work will tell one right quick if the pallet pocket isn't clean, or if the HDPE I made it from is warping. I get the impression this stuff is wiggling around like a worm on a fishhook. Wood didn't work, this almost does but I am not about to make one from alu, that is too hard on the engraving bits when it touches that. I have some 1/2" micarta I use for zero clearance inserts for the table saw, and that stuff might be the next 'pallet' material. What would you folks use when you need an insulated pallet? 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> "When people are least sure, they are often most dogmatic." -- John Kenneth Galbraith ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
