I know that noise and the finish. On much bigger and more rigid machines and even using bigger tools It's the same problem. Since you have limitations with toolholders and the spindle itself, the deeper the pocket gets the longer the tool/toolholder gets. The cutters themselves flex enough by themselves, then you go adding more length and it just gets worse. If you're lucky you can find a sweet spot between feedrate and RPM.
Dale Roland wrote: > At 10:35 AM 28/03/2007 -0400, you wrote: > > > >>over half an hour per pass though. MCS is selling a little air grinder >>rated at 70k rpms, I wonder how that might work mounted on the side of >>the head on my micromill for something like that? Has anyone here >>attempted something along those lines? >> > > > When I was working on the Emco mill, 1mm carbide bits had a short, costly > life, so we wanted to try using tungsten dental bits. This was for > metal-work, doing fine work on brass patterns for spin casting. > > We ran some straight line test cuts in steel with a mock up, and it seemed > ok, so we removed the milling head entirely and mounted a Pferd air-tool. > Firstly, the air consumption had a fair size compressor running at 50%. Then > we found that the spindle on the air-tool is not rigid enough. It's fine when > you use it manually, since you 'press' as required, with visual and audible > feedback, as well as being able to tilt the tool for a better scallop, but > for automated running it was a disaster. Especially in cavities, and cutting > 'downhill' it tended to bite and whip, making horrible squealing noises with > a crappy finish. Steel or brass yielded similar results. We abandoned that > idea, but i'd be interested to know if anyone had more success with a bigger > tool. > > Regards > Roland Jollivet > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
