On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote: ... snip > A far at the pair of 50's is concerned, they will also stop it fairly > quickly. Mine is maybe 2 or 3 turns from the full 2500 rpms, and some might > call that a little brutal, but I have been doing it for at least a year with > no ill effects that I have detected. A single 50 would probably be fast > enough, and certainly easier on the PM fields of the motor.
That brings to mind, my Hardinge has a screw style chuck mount which seems like Russian roulette when using aggressive decelerations. An A5 spindle is on my wish list. Another thought, for DC spindle motors, I've done a bench setup with a tread mill motor and Jon's PWM drive. With a minor modification, it worked very well. With its four quadrant feature, I suppose it could allow some axis capability. If one needs a new DC (or universal) drive, this could be a cost effective way to get one. Plus you don't need to monkey with an analog signal. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
