Cutting left hand threads

triac · Post by **triac** » Fri 05 May , 2023 0:24 am

Hi All

Anyone been able to cut left hand threads on an Orac cnc ?

Marcus

Steve · Post by **Steve** » Fri 05 May , 2023 9:37 am

I cant see why it would not be possible.

The thread routine would have to cut from the chuck towards the tailstock to keep the spindle direction the same and use the same tool.

Quick Turn 2D writes threading routines this way for LH threads.

triac · Post by **triac** » Fri 05 May , 2023 14:17 pm

Hi Steve

Thanks for your reply.
I should have added "using the original programming method", the threaading cycle G33 doesn't give provision to thread from the chuck to tailstock,
also no G95 available to just do a cylic program.

I wanted to use the Orac for this job but will have to run it on my Compact 5 cnc which will do LH threads as standard programming.

Marcus

Chris54 · Post by **Chris54** » Wed 19 Feb , 2025 21:18 pm

I managed it with original programming, just swapped 2 phases to run the spindle in reverse

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