The mazak at galesburg fest did spindle orient using the vfd and encoder. It was a bit 'loose' because of the gear box play. It worked ok as far as I could tell. (maybe a bit slow)
You can see it here. https://www.youtube.com/watch?v=vNn-Yr7it5s Here is a bit better implementation of vfd orient. https://www.youtube.com/watch?v=D6dGYsXAPIU The k&t has a mechanical orient - the spindle has to be in a certain gear - then a hydraulic dog is engaged and the spindle is creeped until it is hits the stop. Much easier ;) http://youtu.be/Kh4YD0d071c sam On 03/04/2013 07:55 PM, TJoseph Powderly wrote: > On 03/04/2013 09:11 AM, dave wrote: >> 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 >> > Dave, > > Hi, thanks for thinking of me, > All my computers from those days are dead > But > Fenn did a great job of documenting during that early fest at Roland's. > His collection can be seen here > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?MazakRetro > > I went back once later to work by myself, but have no pics now. > I sent some to Matt and Ray regarding a sensor for tool change. > > Hope you are all recuperated! Spring time is comin! > > regards > TomP > tjtr33 > > > ------------------------------------------------------------------------------ > 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 > ------------------------------------------------------------------------------ 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
