Full 3d design based off of maslow

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?

look at the hangprinter project.

David Lang

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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)

YES!! I’m not using it for 3d printing but that’s exactly the design style I needed, thank you.

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