[gogego]

I have made programs, on FANUC control machines, for external threads with blunt starts.
Now I am running into issues of the tool not escaping fast enough to avoid clipping the following thread as it exits the cut.
Here are 2 program examples I have attempted without success.

ex.1 M22 chmfer off
...
G71 X3.678 Z-2.98 I0 B0 D.009 H.09 F.0833 M32 M75 M22
...

ex.2 M23 chamfer on
...
G71 X3.678 Z-2.98 I0 B0 D.009 H.09 L.1 F.0833 M32 M75 M23
...

Any suggestions are appreciated

OSP700L control

[ghyman]

I've had great luck using a G34 move in Z, followed by another G34 with a very small (~.010") Z move and a large X move at the same feedrate (The Z is necessary so the control can apply the feedrate properly.)
The only caveat is that the blunt start routine may need a slower RPM, because the acceleration curve of the X-axis drive may be such that is does not achieve full speed until it is already clear of the part.
I'm currently getting a 1" long (1" along the circumference) blunt start on a 6" diameter thread; threading cycle is at 175 RPM, blunt start is at 125 RPM.

[OkumaWiz]

It looks to me like you need to change your B value in order to accomplish this with the G71 cycle. B0 effectively turns off any chamfering since there is no angle of chamfer.

Ghyman's suggestions should also work.

Best regards,