On Saturday 21 July 2012 11:45:42 andy pugh did opine: > On 21 July 2012 05:09, Jeshua Lacock <[email protected]> wrote: > > 550 RPMs does not exactly strike me as spinning at high speed. > > Besides, wouldn't the gyroscopic force help stabilized oscillations? > > No, centrifugal force acts as a positive feedback on any off-centre > movement. > > As Steve has said, there are specs for this in the ballscrew > catalogues, and he seems to be suggesting that 25mm is fine for 10' > according to them. > > As a warning, whipping can be a deadly problem with long bars out the > back of a lathe headstock. They need to be restrained quite strongly.
Yeah, I've had to make s miniature gun barrel spider for my mini-lathe and dial that in pretty closely if I want to turn more than 3 or 4 hundred revs. I once had a 3 foot piece of hot roll making a 4" circle on the far end, scary. It was only off maybe 1/16" turning the chuck by hand! 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> is up! Oppernockity tunes but once. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
