On Fri, 2008-03-07 at 20:50 -0500, Dave Keeton wrote: > Our Mazak Lathe has a turret that uses a belville spring washers in a > friction brake. The nice thing about it is that when a collision occurs the > turret is pretty easy to get back on centerline. It uses a shot pin to > locate that is pulled back out when it is clamped. It is hydraulic > though.....It has live tooling also.....we never use the live tooling except > tapping every so often...... If you use pins to locate and hold the tool > drum in place it is more difficult to align after collision.....I am not to > sure about the disc brake idea.....Seems like tool pressure might make it > slip....could be dangerous in a power failure also...... > > Dave
So is the turret located by engaging a pin, setting a brake and then retracting the pin so that only the brake friction holds the turret position during machining? I assumed that with a tool crash that you would either break the tool, holder or turret. Rumor has it that a small lathe tool changer is available from Emco which can be seen at the bottom of the page here: http://www.emco.co.uk/pct55.htm I hear that it has a pawl on the turret drive shaft. The turret motor drives the turret until the pawl falls into the location for the desired tool. It then reverses against the pawl to lock it, take out all slop and get the final position. The turret rotates in a direction such that the cutting forces are also against the pawl, but apparently the pawl can flex under heavy cuts. This design has the advantage of being very simple, maybe even elegant. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
