Mach3 post processor 3+2 axis without TCP function

[tobias.schroedel]

Hello, everyone,
I'm looking for a 3+2, or even better 5-axis simultaneous post processor for Mach3 controls.
Unfortunately, my machine and control do not support a TCP function (tool center point). I tried to modify the Mach3 PP as in this guide:

How to set up a 4/5 axis machine configuration in Fusion 360 

Here I have specified the physical distances between the spindle tip and the center of rotation using the Offset parameter.

Unfortunately without success. When pivotingthe A axis, the post would have to compensate for all movements with Z and Y. But this is not the case. In addition, the machine simulation does not work. On the advice of another forum, I tested a standard Fanuk PP. Here the machine simulation works as desired, i.e. a step further, but unfortunately the PP does not compensate with Z and Y here either when the A-axis is swiveled in.

I hope someone could give me the missing approach or even a working PP

[AchimN]

The current version of the mach3 post processor does not support axis offsets for non TCP machines.
What kinematic are you trying to use?

For now it would be the easiest to just place the WCS origin into the center of rotation in Fusion, is that an option for you?
If you would do that the post does not need to compensate for offsets/pivot distances and you should get a functional nc program.

[tobias.schroedel]

Good evening @AchimN ,
Thank you for your prompt reply.
In the attached pictures you can see the kinematics of the machine. I also made a simplified sketch for illustration. Unfortunately, with this setup it is not possible to place the WCS on the center of rotation.

Is there a possibility to use another PP that is compatible with Mach3 and supports the offset function?

Many greetings
Tobias S

[AchimN]

Ah ok I see.

The generic Fanuc post would be a good one for this since it supports latest functionality and only a few settings are required to be made.

We do have work in progress to update the Mach3 post with this functionality in the near future.

Are you using a machine configuration for the machine model you have there? Can you share it?

[tobias.schroedel]

Hello @AchimN 
I hope I understood that correctly.
Do you mean a 3D model of the complete machine?
yes this is available. I also share with you my modified PP for Mach3.

I would also very much appreciate it if a complete machine simulation were possible with the PP. Unfortunately, the Mach3 PP does not support this function.
When I tried something out with the Fanuk PP, an extensive machine simulation was possible there. Unfortunately, the G-code didn't fit.

Best regards
Tobias S

[AchimN]

Hi Tobias,

thanks for sharing the data.

I think it will be the easiest when I share the updated mach3 postprocessor with you on which we are currently working on. I will send it to you within the next hour.