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Does anyone have an updated fanuc generic post for 4th axis that uses A-axis. My machine does not support G68.2 and I can't find a post that will work. Any help or information is much appreciated.
Donnie
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Hi,
I only have a post processor for Hyundai Wia with Siemens, but I can help you to write post for Fanuc.
Feel free to send me a message if you'd like to use my services.
---
If my response answers your question, please use Accept Solution button.
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So, could you tell me how to disable G68.2 and enable A axis? I can change the post, just not sure what to change.
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If you are using the Fanuc post processor, it's simply a matter of two steps:
1) Set this to "false":
2) Use a machine configuration that has 4 axis motion defined in the kinematics. I've attached a sample file that will give you something to start with

Seth Madore
Customer Advocacy Manager - Manufacturing
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Ok, so I tried what you told me and I've snipped a pic of what my results were.
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It appears then that the toolpath you are trying to use has some 5 axis motion in it. Are you using the machine configuration and post processor that I shared in my last post?

Seth Madore
Customer Advocacy Manager - Manufacturing
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So, I took my file and posted it out with the fanuc A-axis inverse time and A-axis and I also think there is something wrong with the wrap toolpath. In simulation in fusion everything looks normal, but after you post the code and put the code on the machine, the machine does fine till after it hits the G43 and then the machine trips out and instead of following the toolpath, the A axis starts spinning like its in a turning cycle. Never seen this before.
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To clarify:
1) Are you using a machine configuration in your setup and is it configured like the one in my example
2) Are you using the post processor that I shared?
3) Do you have your WCS located at center of rotation?
4) The snip of code that you shared doesn't look that out of the ordinary to me, what exactly is wrong here?

Seth Madore
Customer Advocacy Manager - Manufacturing
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Yes, I'm using a machine configuration file like the example you sent me
Yes, I used the post processor that you shared and it posts out with G68.2, my machine can't use G68.2, has to use the letter "A" for the axis designation, not G68.2
Yes, I made sure that my WCS is on the center of rotation, if it wasn't the toolpath wouldn't look right in simulation
So, because my machine can not use G68.2, I posted the code through a different fanuc post to try it. I have used the Fanuc A-axis inverse time and A-axis processor in the past with no issues. But when I posted the code out and put the file in the machine and ran it, the machine does fine until after the G43 line, then instead of following what it should do in simulation the 4th axis just takes off spinning like i'm running the file in a lathe. Thats the reason why I'm trying to use the generic fanuc post and change it from using G68.2 to using the letter "A" designation for the 4th axis. There aren't any other options for the machines that can't use G68.2 that I can find.
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The sample I shared would only produce A axis values, no G68.2 at all.
Would you be able to share your Fusion file here?
File > Export > Save to local folder, return to thread and attach the .f3d/.f3z file in your reply.

Seth Madore
Customer Advocacy Manager - Manufacturing
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While you did have a machine config file, it was not setup similar to the one that was in the file I shared. There were settings in the -A- axis config that were not correct, they needed to look like this:
I've attached your file, you will need to copy these changes over to your own machine config file. I've also attached the resulting NC code for you to verify that my results were indeed what you were looking for.
This was using the fanuc_noG68 post I shared earlier.

Seth Madore
Customer Advocacy Manager - Manufacturing
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Hi ya Seth, can you look at what I sent you again. So after I said it looked good, I got mine to match your post. So upon checking the simulation to what was output in the code, there are no Y axis movements. If you look at the simulation on the info tab, and check it with the code that the post output, you'll notice what I mean. Let me know if something is wrong.
Donnie
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I've received your message. For simplicity sake, please keep all discussions to this thread ![]()
I've got many other things on my schedule today, so it may take a bit to address your specific issue.

Seth Madore
Customer Advocacy Manager - Manufacturing
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Ok, wasn't sure if the thread closes once a solution has been given, but will remember that for the future. Just get to me when you can, I got alot going on today as well.
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The only Y axis moves you are going to see are at the beginning and end of the cycle. The 2D Adaptive and 2D Contour Wrap toolpaths are always pointing the tool to centerline. When you view the coordinates in the Simulation, it does not take into account what the post processor/kernel are going to do.
N65 M08
N70 G00 X1.275 Y0.
...
...
...
...
N965 G00 Z7.5625
N970 M05
N975 M09
N980 G28 G91 Z0.
N985 G90
N990 G49
N995 G00 A0.
N1000 G28 G91 X0. Y0

Seth Madore
Customer Advocacy Manager - Manufacturing
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Fusion