Here you can read how Phil Moore of PMinMO.com takes care of the hold-down problem: http://millpcbs.com/index.php?option=com_content&view=article&id=17&Itemid=46. No need to make it more complicated than necessary.
>________________________________ > From: gene heskett <[email protected]> >To: Enhanced Machine Controller (EMC) <[email protected]> >Sent: Tuesday, January 10, 2012 11:53 PM >Subject: [Emc-users] Correcting for workpiece warpage. > >Hello all; > >In carving these pcb's for the encoder, I only have room to clamp one edge, >the back edge of the pcb. > >I carved a dead flat pocket about 30 thou deep and slightly larger than the >raw pcb material, gouging out the left front corner so the board, when >pulled left & forward, isn't riding the corner, but is located by the left >& front edges of this plywood containing the milled pocket. But when I add >a small board across the rear edge of the board and clamp down on it, the >front edge of the board rises slightly, about 5 thou I'd SWAG. > >Is there a way to couple the y axis position to a small z axis shift so >that the engraving tool will stay within a thou or so of the correct depth >relative to the warped pcb's surface by driving the z deeper as y moves the >table forward to work on the rear portion of the pcb. Something on the >order of 5 thou down at the rear of the board, over a y travel of 1 inch, >would help, a lot. > >I've read the pages about mapping screws, but ANAICT, that can only correct >the same axis for errors and wear in that axis's drive, but I don't see a >way to make z move as y moves. > >Is it there & I'm too dumb to find it? > >Thanks everybody. > >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> ><Kensey> RMS for President??? ><RelDrgn> ...or ESR, he wants a new job ;) > >------------------------------------------------------------------------------ >Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex >infrastructure or vast IT resources to deliver seamless, secure access to >virtual desktops. With this all-in-one solution, easily deploy virtual >desktops for less than the cost of PCs and save 60% on VDI infrastructure >costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox >_______________________________________________ >Emc-users mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
