Hi All,

Long time lurker, first time poster here.

We recently acquired a Colchester 3000L CNC Lathe with Fanuc OT control.

Amazingly, everything is working just fine with the exception of bar puller work. The programme just stops after either an M78 or M79 when in auto run mode, my program is as follows (we are using a 'crocodile' style puller):

T0404
G00X20Z-14.6
G94G01X-10F500
M78
#HAVE TO PRESS CYCLE START HERE#
G04U2.0
G01W10
M79
#HAVE TO PRESS CYCLE START HERE#
G04U2.0
G01X20
G00X200Z200

I have tried M31/M32 to 'ignore' the spindle interlock function but the program just freezes when it tries to run the codes (I assume it doesn't recognize them).

Can anyone point me in the right direction?

The book clearly states that M78/M79 are for opening and closing the chuck for bar feed/bar pull work.

Any help much appreciated, also I am missing the Fanuc OT Operators Manual if anybody has a spare copy!

Thanks all, John