On Tue, 25 Jun 2019 at 14:27, Gene Heskett <[email protected]> wrote:
> Absolutely. And in the ER32's turning 3G's max in my G0704's abused > spindle, balance is not a prime concern, but in an ER20 where you expect > to hit perhaps 15k revs, or in my 6040 with its ER11 turning 24k, a few > milligrams can destroy the motors bearings eventually. An ER16 nut is 22mm dia. Centrifugal[1] force is MR(omega)^2. 24k rpm = 2513 rad/sec So the bearing force on a 24k rpm ER16 is 138N / g. To put that in perspective, FSWizard suggests settings that give a 30N cutting force on a 3mm cuttter. I expect that the oscillatory nature of the centrifugal force gives the bearings a harder time too. [1] I have a physics degree, I am licensed to use centrifugal force[2]. Do not try this at home. [2] www.xkcd.com/123 -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
