Would one be able to create a fully 3d positioner using a similar setup as the maslow? The layout would be like a scaled up delta 3d printer with 3 chains hung on fixed posts controlling the end effector (weighs around 10 lbs-20lbs). I understand the accuracy will be lower than the 2d design but for my purposes I only need ±2" accuracy and there will be no forces acting on the end effector. I only need the positioning capability.
What problems do you forsee coming up?
What force would the motor feel?
Yes. But also no. You couldn’t do it with 3 chains with any kind of accuracy as the platform being moved wouldn’t stay flat introducing a lot of error, however you could do it with 6 chains that attach in the same way at top and bottom.
±2" on what length? in a 2" space that’s 100% error in a 200" space its 1%.
Kinematics will be… fun to work out… Otherwise its theoretically pretty simple, however in practice you introduce a lot of difficult to control variables such as frame rigidity, belt tension, calibration, etc.
Not sure what you mean by what force would the motor feel?
I was thinking of some type of gimble to keep the platform level, similar to how the router assembly rotates in 2D.
My goal is a work area of 10’ square and 6 foot high but 4’x8’x4 would be adequate. ±2" in the xy directions. Z axis doesnt matter as much, maybe around ±6"
Im not able to use 6 cables, all the connections need to be above the end effector.
And Yeah. Im scared of the kinematics lol I think it’s almost within my abilities though, just need a little more learning
What I meant by motor force is what would be the maximum tension felt on the chains at the most extreme position (top corners of workspace)