Exploring Geo Correction Beyond the Z-Axis for CNC Bed Surface Roughness

[Wayne]

Hi all,

I recently attempted to use geo correction to address the surface roughness of my CNC bed. While it works for Z-axis, I am curious to know if geo correction can be applied to axes other than the Z-axis. The reason for this is that I have been using dual loop control, with my A-axis assigned to measure the Z distance between a probe and the bed surface. The geo correction, which is formatted as (row, col, X, Y, Z), only corrects for Z-axis, and the correction was not applied when the axis was switched to A.

It would be great if such correction can be applied on both Z and A.

Many thanks!!!
Wayne

[TomKerekes]

Hi Wayne,

It's not exactly clear how your machine works or why if you have a bed following mode you would want to make corrections to not follow the bed.

One option might be to have your bed following mode still use the Z axes by re-assigning the Coordinate Motion System. Do you need corrections in both modes? Are the corrections the same?

KinematicsGeppettoExtrude.cpp has Geocorrection for X Y Z and C. Do you know how to recompile the libraries using Visual Studio? See here. You could then make a new class such as KinematicsGEO_XYZA modeled after CKinematicsGeppettoExtrude with everything removed except the Geocorrection functions. Then modify the Geocorrection to use C instead of A. See here on how to make a new Kinematics Class.

HTH

[Wayne]

Hi Tom,

Thank you for your detailed response. I appreciate the insights and suggestions you provided. Since I don't have any recompiling experience, this approach might not be straightforward for me. However, it's good to know and will help me rethink my approach.

Many thanks!!!

[TomKerekes]

Hi Wayne,

Thanks for posting back. If you decide that the code needs to be changed we can help with that.

Good luck.