Variable Pitch thread G34

[jrykrl]

I have a Fanuc O-i control on a Femco lathe.

Is there a parameter to change to use the g34 code? Has anyone used this and can give me an idea where to start?

I need to do a 1 inch per thread to a 1.75 inch per thread over 20". 15 turns

Cant find the info on the net, so I thought I'd hit up the real geniuses here!

Thanx

Jer

[Guest CNC Apps Guy 1]

Will look in my manual now.

[Guest CNC Apps Guy 1]

Here's the format;

 

G34Z_F_K_

Z = Endpoint

F = Lead in longitudinal axis direction at the start point

K = Increment and decrement of lead per spindle revolution.

 

Warning; Thread Cutting Cycle Retract is NOT effective for G34.

 

 

I can't find any parameters related to it controlling the cycle. I'll look further.

[jrykrl]

thats what I had in the book too, couldn't get it to work on one of the lathes, but it seems to on the other,

Just need to figure out how to make it do what i want now.

[Guest CNC Apps Guy 1]

It may be an option. I've never used that cycle tomorrow so I have no idea.

 

Sorry I could not be of more help.

[jrykrl]

When, not if, I get it to work, I'll post a sample of the gcode

[jrykrl]

Ended up using rolldie on the 4th axis instead.

Thank da lord for the search function here, and all the brains.

J to tha K