As to [1} shouldn't that be centripetal force? 😊 Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031
-----Original Message----- From: andy pugh <[email protected]> Sent: Tuesday, June 25, 2019 10:30 AM To: Enhanced Machine Controller (EMC) <[email protected]> Subject: Re: [Emc-users] Spindle experiences/recommendations? 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 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
