Ballscrew articulation, has anybody had success?

I have designed a few iterations, 8 degrees plus and minus (16 total) can be done with just ballscrew mapping on Mach3 using an 80mm water cooled spindle held in a pillow ball.
Bigger ambitions require more forethought.

That's a good point, ballscrew mapping would probably work for LinuxCNC too.

Hi

I am new to CNC and specifically LInuxCNC. I am trying to build something like this for my B axis except I use the ball screw to turn the spindle rather than turning the workpiece. So it is possible to write a math function to relate the linear motion to the angle of the axis. It is similar to the formula used to find the crankshaft angle when the piston has travelled x distance. Like this

But how do I enter this into LinuxCNC? I am ok with the math I need help on the implementation into LinuxCNC

Normally you get better answers on a forum if you show you've put in some effort yourself, and then ask more specific questions.

You can start by reading about Kinematics in LinuxCNC

linuxcnc.org/docs/2.8/html/motion/kinematics.html

In short: You write your custom kinematics in C, and "halcompile" compiles it into something compatible with LinuxCNC.

Thank you Paul, I did spend a lot of time reading but as a person who has never had any experience using LinuxCNC I wasn't confident enough about the general direction I was headed in. With your input I can go ahead in this direction and learn more on my own. Thank you so much

Sanity check - if one put encoder not on ballscrew, but on swing axis itself and use servo driver with speed input - nothing need to be adjusted. Encoder output should be sent to controller of course. Servo should slightly overbuild for this setup,