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On Tue, Feb 1, 2022 at 6:46 PM Hagen SANKOWSKI hsank@posteo.de wrote:
Are we crazy, thinking about a laser beamer, which is a turntable instead??? Doing Layouts not in a Cartesian but in a Polar coordinate system??? Even spin-coating seems to work.
the only things to watch out for:
1) at the furthest extent of reach is the accuracy high enough.
2) are the steppers accurate enough (i.e. don't use anything other than Trinamic)
3) at the higher accuracy is the holding force enough (for every extra doubling of the stepper accuracy you correspondingly lose double the holding force)
honestly i wouldn't consider it, but if you do, actually mount the robotic arm, held upside-down, on a standard X-Y cartesian overhead gantry.
then you get the best of both worlds.
* X is cartesian * Y is cartesian * Z is cartesian * robot-rotate (about Z) is polar * robot-extend-outwards (if you even have it) is polar * robot-up is polar
l.