Fanuc G71 G72 equivalent

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09 Mar 2018 18:51 #107167 by ReinaldoP
I already know there is no G code in linuxcnc for accomplishing the same thing as a Fanuc lathe canned cycle. But the problem is almost all our shop programs have G71,G72 cycles. So my plan is creating a subroutine that does the same as the Fanuc canned cycles.

Anybody tried this before?
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10 Mar 2018 02:11 #107180 by cmorley
Replied by cmorley on topic Fanuc G71 G72 equivalent
I would search the forum and mail list - I remember people working on something like this. (but it might be a different g code)

Chris M
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12 Mar 2018 13:46 #107244 by andypugh
Replied by andypugh on topic Fanuc G71 G72 equivalent

ReinaldoP wrote: I already know there is no G code in linuxcnc for accomplishing the same thing as a Fanuc lathe canned cycle. But the problem is almost all our shop programs have G71,G72 cycles. So my plan is creating a subroutine that does the same as the Fanuc canned cycles.


There is (incomplete) work on adding this to LinuxCNC in this development branch:
github.com/LinuxCNC/linuxcnc/tree/BenPotter/G71

Alternatively the codes are implemented as a Python remap here:
github.com/LinuxCNC/linuxcnc/tree/andypugh/g71type2remap

The latter version does not do tool radius correction in the roughing cycles. It _ought_ to work on the finish pass.
(The reason to move the code into the main LinuxCNC C++ code is to use the already-existing compensation rather than re-code it in Python)

I wrote docs for the G71 cycle here:
github.com/LinuxCNC/linuxcnc/blob/22e10f...ughing-cycle-turning

It should be fairly easy to add the remap to your own installations, but it isn't 100% of all that the cycles should be.
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12 Mar 2018 15:06 #107245 by ReinaldoP
Replied by ReinaldoP on topic Fanuc G71 G72 equivalent
Thanks Andy, Ill look into that. Ive been working with Linuxcnc for years now in our shop and this is going to be a lifesaver. I'm still running 2.6.7 with a modified gmoccapy gui so I'm hesitant on upgrading due to all the tweaks I've done thru the years with gmoccapy
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12 Mar 2018 15:20 #107246 by andypugh
Replied by andypugh on topic Fanuc G71 G72 equivalent
The remap ought to work with 2.6.7
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