Hi Toby,
... you have a line, but the stepsizes along the line follows a sine-function, so you have similar recalculations, as with my tripod-systems ...
Look at my posts about the tripods ( [
forums.reprap.org] , [
forums.reprap.org] and [
forums.reprap.org] ), especially at the images - here the moving structures didn't have friction or feeding.
All stiffness is in the bars and the hinges or magnetic spheres are absolute precise, so this apparatus can build very precise.
But i have to adapt the controller to convert the cartesic slice-coordinates in angular or nonlinear moving of the motors ...
If i have the algorhythms, then the mechanic is no problem - as in the magnetic-self-joining, the rods stick together 'automatic'
Viktor