Ballscrew articulation, has anybody had success?

Has anybody replicated a 'port block' style of milling machine?

Didnt think they used this on cnc machines, but I guess you can get a whole 120 degrees outta it so not bad. I figured control would be something linear like (ballscrew travel/total degrees)/steps per mm

tommy, it looks like centroid has a 5 axis mill that uses linear ballscrews for rotary motion, like those fancy laser adjustment stages.

Thats if I understand it correctly. I havent seen any diy implementations before but my interest is piqued now.

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.

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.