On Sun, 11 Oct 2009 08:47:27 -0700, you wrote: >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.
Been there, had an 8inch dia 4 jaw come off on me and dance around the shop, the Lexan window, behind where I was stood is still cracked ;) Easy enough to drill and tap a hole, fit a set screw, job sorted. Thankfully my current lathe has 3 studs with a camlock. The smallest chuck I have is 6 inch diameter and it's 3 inches deep. I can stop that in two turns from 3200 rpm without a brake, but why? I have yet to come across a practical reason to do that, apart from a bragging contest. The only possible theoretical reason is tapping, the drag off the tap, and the slowish speed means it stops pretty well instantly anyway. I must be doing it right, over the years I must have tapped many tens on thousands of blind and through holes and have yet to break a tap. These days I also "cheat" slightly and mainly use a Tapmatic SM4 extending nose tap holder, makes life so simple :) Steve Blackmore -- ------------------------------------------------------------------------------ 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
