09-23-2012, 05:28 PM
I haven't had the 10" 4-jaw (a pukka Pratt Burnerd) up to the max' 2250RPM yet, as anything that needs the big chuck is going to be a bit big to need 2200 RPM! For high speeds I have a small (6") 4-jaw with a "DIN xxxx" marking on it which give a max' of 2200 (close enough...) or there are always collets! Hell, if I'm going to be sloppy, there's always the 3-jaw, too ;)
I'd be more worried, I think, about running a big 3-jaw at high speed on a Lathe With Brakes (mechanical or VFD), as it *is* possible on some to spin the scroll in a panic stop, leaving the work spinning in mid-air... A bit like screw-on chucks and spindle brakes, Not A Good Idea!
Dave H. (the other one)
I'd be more worried, I think, about running a big 3-jaw at high speed on a Lathe With Brakes (mechanical or VFD), as it *is* possible on some to spin the scroll in a panic stop, leaving the work spinning in mid-air... A bit like screw-on chucks and spindle brakes, Not A Good Idea!
Dave H. (the other one)
Rules are for the obedience of fools, and the guidance of wise men...
(Douglas Bader)
(Douglas Bader)