I am trying to put a bar puller on this machine, I'm pretty sure it is possible. however I seem to be having problems with the chuck clamp interlock I can program a chuck clamp and un-clamp & actuate the bar puller, but when the chuck is in the un-clamp position I can not move the Z position to actually move the part out, is there a trick to this? can I turn off the switch that tells the machine not to move when the chuck is un-clamped? the control is a Fanuc OT.

Thanks John

Try using a M31 (main spindle interlock) this should let you move when the chuck is open

Are you switching from IPR feed to IPM feed when you try to move your Z axis?
If so and you can't get movement in Z axis, I have ran across some Leadwells with Fanuc OT controls that required you to command a spindle speed of 0 before they would allow you to move the axis. We would use this block to prep the movement in the Z axis.

G97 S0;

Then it would execute the movement.
Don't forget to switch back to IPR mode after your bar puller.

Regards
Paul

I have just tried both of these suggestions, and the machine still stops after the chuck is un-clamped (M69).

any other suggestions,
thanks

John

could post the part of the program that is not working

I am thinking there is nothing wrong with your program in which case I can't help you. Here is a sample barpull operation that works on our Puma 8 with OT control.

N100M9 (BARPULL)
G0X6.Z6.M41
T0101M5
X2.Z-1.7
X-1.5
M69
W1.38
M68
G0X2.
Z2.
X0Z6.T0100
M1

thank you, I will give it a try.

thank you, I will give it a try.

Our lathe has the same control as yours. If it doesn't work, then I think it is a pretty safe bet that the program is not the problem. You will need help from someone else as I know very little about the maintenance side of lathes.

Good luck. :)

This little program works great on my Daewoo Puma 8s with Fanuc OT-C control.

(BAR PULLER)
T0808
G0X2.Z-.35(APPROACH BAR IN RAPID)
G98G01X0.0F50.0M31(FEED ON THE BAR)
M69(CHUCK OPEN)
G01Z1.055F50.0M31
M68(CHUCK CLOSE)
G01X2.0F50.0M31(FEED OFF THE BAR)
G99(INCHES PER REVOLUTION = G99)
G28U0.W0.(RAPID FROM BAR TO HOME POSITON)
M1
M99
%

Reply back with your results.