acryllic (plexi glass) is fairly rigid. some epoxies are too. there are some hard waxes. crystalline sugar? amber. plaster. concrete. glass. ceramics. very very cold chewing gum.
--- On Sat, 2/4/12, gene heskett <[email protected]> wrote: > From: gene heskett <[email protected]> > Subject: Re: [Emc-users] Workpiece is longer than the mill travel > To: [email protected] > Date: Saturday, February 4, 2012, 3:04 PM > 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<[email protected]> > wrote: > > >> On Sat, Feb 4, 2012 at 12:11 PM, Erik > Friesen<[email protected]> > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
