On Mon, 2013-03-04 at 10:09 +0000, andy pugh wrote: > On 4 March 2013 07:38, Kirk Wallace <kwall...@wallacecompany.com> wrote: > > > The dog keys are not installed on the end of the spindle, though there > > are slots and threaded holes. With a modern VFD on the spindle, it might > > be easy enough to install the tool with a slight up pressure and rotate > > the spindle until the the tool engages the keys and seats, but he keys > > would interfere with the gripper as is is now. So far, the tools seat > > well enough without using the keys. > > It is probably possible to carefully align the spindle for tool-change > if there is a spindle encoder. > > Wikipedia is quite clear on this point, and it matches my understanding: > "This is a "self releasing" or "Fast" taper. Unlike the more acute > self holding tapers above, such tapers are not designed to transmit > torque. This turning effort is carried by driving keys engaging slots > on the flange." > > However I have trouble seeing how you can hold a CAT flange and still > allow the dogs to engage. BT flanges have a gripper groove which is > far enough below the keys for there to be no interference. ( > http://www.bright-tools.com/news_show_79.html) > There is rather less space on the SK flange. ( > http://www.morari.it/home/en/products/adjustable-heads/cone-std-din-69871 > ) so I don't know how those avoid gripper-to-key clashes. > The mazak v5 does it all the time. Semi-circular ring with a spring driven pin to go in the groove. Rotate in, come up, clamp the tool holder, move down, rotate, come up, go down and to rest position. The mazak also has a mechanism for dog alignment; on some it is mechanical on other sensor or encoder driven.
Sorry I don't have pictures. Maybe tomp has a picture from his fine collection re' Galesburg. HTH Dave > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
