G78 threading cycle on Fanuc 0i-TD

[Deco-Doctor]

Hi

I am trying to program the G78 threading cycle on a Fanuc 0i-TD without the proper Fanuc manual. I have the standard 0i-D manual which does not cover the G78.

Please can someone who knows this control jot down a quick example for me, say an M8 x 1.25 external thread 20mm long, 5 rough passes, one finish pass and one spring cut.

Thanks for your help

[dcoupar]

If I'm not mistaken, the G78 cycle is programmed exactly like G76. The G76 is used in G-Code systems A and B, the G78 is used in G-Code system C. Have you tried the G76?

In my experience, most Japanese/Taiwanese/Korean, etc. machines are set up to use G-Code system A. Some American-made machines were set up to use system C.

[Deco-Doctor]

Originally Posted by dcoupar If I'm not mistaken, the G78 cycle is programmed exactly like G76. The G76 is used in G-Code systems A and B, the G78 is used in G-Code system C. Have you tried the G76?

Hi - Yes it seems you are correct. The parameters for G76 seem the same. I have not tried G76, but I will now.

Any idea what the difference is between G76 and G78?

Many thanks

[dcoupar]

No difference other than the G-Code system.