G76 problem ( i think !! )

[m_c]

Does it actually pause, or does it continue to retract very slowly?

There is a 'glitch' with turning, external motion controllers, and certain versions of Mach3, where at the end of the threading move when things should switch from mm/rev to mm/min, it changes mode but doesn't update the feedrate. So if you were doing say a 1mm pitch thread, it'll switch to 1mm/min and retract at that speed until the retract move is done, at which point the feedrate will update to the correct rate.

It's a known problem with later versions of Mach3 that CS-Labs can't do a tapered lead out, and you have to have a groove at the end of the thread. I've also witnessed it when using Mach 3 with my KFlop controlled lathe.

[magicniner]

Try different versions of Mach3, different bugs are present in different versions and the latest is not the best as the inadequate knobsocks who bought the company were balls deep in knackering the product when they stopped trying to fix their cock-ups and moved on to several years of advertising Vapourware and selling broken shit.

[swdiver]

Does it actually pause, or does it continue to retract very slowly?

There is a 'glitch' with turning, external motion controllers, and certain versions of Mach3, where at the end of the threading move when things should switch from mm/rev to mm/min, it changes mode but doesn't update the feedrate. So if you were doing say a 1mm pitch thread, it'll switch to 1mm/min and retract at that speed until the retract move is done, at which point the feedrate will update to the correct rate.

It's a known problem with later versions of Mach3 that CS-Labs can't do a tapered lead out, and you have to have a groove at the end of the thread. I've also witnessed it when using Mach 3 with my KFlop controlled lathe.

Thats brilliant thank you !!
I have just run the code direct from the wizard and from my saved files,
You where correct , it was in fact moving very slowly , i'm not sure how i didn't notice the DRO's changing.
I then ran them while watching the diagnostics screen.
Loading from the wizard automatically sets a G95 mode where as my saved code did not contain the G95 so was still in G94.
I added a G95 to the threading part of my saved code and it ran perfectly.

This has all been a very steep learning curve over the last few months and i must say that the idea of uninstalling and reinstalling another version of mach3 would fill me with dread !!
Can you recommend another Mach3 version that may work,
although I think for now i will just remember to manually add G95 + G94 commands into the code.

I had also spent some time trying to achieve a tapered lead out to a thread with no success so my failure there makes more sense now.

Thank you so much for your help i had been scratching my head for ages trying to figure this out.