If you have the money for them, Micromo makes some excellent motors that have bearings rated for the higher speeds. Not sure how much torque you need, but they might have something.
http://www.micromo.com Javid ----- Original Message ----- From: "Dean Hedin" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Thursday, March 29, 2007 6:59 PM Subject: Re: [Emc-users] tiny bits.. > Gene, I definitely agree if I could spin the bits faster I could reduce > tear > out. > > The only thing that I though might work (to get better rpm's with tiny > bits) > is to use one of those > brushless DC RC airplane motors. Some of them run up to 55-60k rpm. I > think I might try this. > > Running a compressor to drive an air tool is not practical for me. > > BTW, Those tiny little router bits are too fragile. I find a much more > durable solution is to grind a carbide blank > to a sharp point. Then grind half the point away from the side. > Splitting > the cone lengthwise, so to speak. > I do this with the blank chucked in the lathe and a diamond wheel on a > tool > post grinder. Takes some time > to do initially but not as long as I thought it would, plus resharpening > takes only moments. > > > > > > ----- Original Message ----- > From: "Roland" <[EMAIL PROTECTED]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Sent: Wednesday, March 28, 2007 6:31 PM > Subject: Re: [Emc-users] Show us your pics of unobtanium! > > >> 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 > [email protected] > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
