Chris, Thanks for the info. I'll give the filtered PWM option a try. I'm in the process of hooking up the spindle encoder at the moment so will soon see what resolution it's got. I can see from the wiring diagram that it's A & B quad and index but I've no idea what resolution. The axis motors all have 8000 count/rev but I doubt the spindle encoder will be so large. By my calcs even if it's quite high it should be OK through the software encoder component providing all of the spindle coordinated moves are at modest rpms which should be the case. The spindle motor and spindle drive are 7kW FANUC units and I believe the drive has an integral braking resistor. I know the axis drives certainly have one. I believe that the machine's original control (Siemens Acramatic 850) did support rigid tapping so I'm assuming it can accelerate/decelerate promptly as required - I'll soon see.
John, This particular machine only has 1 gear (0-8000rpm) but thanks for the heads up. Regards, Neil ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. 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
