Indeed, it would be nice to have EDM capabilities within emc. :-) Pete has always maintained that the power supply was the easy part. He recommended using a RC source to get started and concentrate on getting the Z motion/gap distance correct. Then work on orbiting and finally go for a nice pulsed source. BTW there is some data that says that jumping the current 20% for the last part of the burn cycle increases stock removal considerably.
Pete's system used fast comparators to adjust the voltage gap. Too low, move up, too high move down; actually I should say step down or up. I was going to try a servo on Z and attempt to keep the avg current in the right range. Dave On Tue, 2010-02-23 at 23:54 -0600, Jon Elson wrote: > Dave Engvall wrote: > > I have no idea if this email still works for Pete. Pete developed a dos app > > for steps-> servo that was pretty cute, including a C axis. > > As a demo he threaded a file with it. > > > OK, so he wasn't using EMC/Linux for that. it was still PLENTY cool! > He had burned a number of > interesting patterns into old files. > > EMC does have the capability of limiting or stopping feed in a wire edm > > setup but no ability AFIK for backing out necessary for sinker edm. > > > If you have good flushing and a system to shut down the feed and pulser > if a short develops, > you may not need the backing up, but that would still be a really good > thing for EMC to have, some day. But, really, > if you are doing a sinker job, you don't need G-code. You position the > X-Y to put the pattern where > you want it, and then need some scheme that could be rigged through HAL > to control the Z axis > based on the EDM current. If you wanted to get real fancy, you could > even have G-code statements > that would set variables for start and end of burn, and these could be > passed to a custom HAL component > that would monitor the burn and drive the Z feed. Ummm, I'm starting > to get itchy to make something! > But, first, I need a good pulser. I know what I want to do, but just > haven't gotten around to building it. > > Jon > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
