Z axis Sarrus 1
by fdavies, published
Description
The total range of movement is just over 100 mm.
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I always wondered how those crushing walls in cartoons worked... you know where the hero (i.e.:Inspector Gadget or Penny and Brain) gets trapped and the arch villain (i.e.: Dr Claw) is laughing hysterically? Thank you for filling in that cartoon magic gap!
I will add this to my list of likes and replicate this design 20X it's original size some time in the future for my own evil lair :-D
I'm so excited to see this hooked up. You're amazing
That is all kinds of awsome! Nice job.
I notice the STL files are slightly different from the model in the pictures at the end of one hinge.
In the STL files there is some interference between the arm, plate b I think, and the bearing mount ring. I guess that's the reason for the new arm design.
The attached picture is your STL files imported to autocad.
I have had the same idea for using a printed sarrus link for the z axis but haven't got any designs for it yet. Good to see other people working on it.
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Instructions
Chase out all the small holes with a 1/16" drill bit, then use 1/16" brass rod to make hinge pins.
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That is all kinds of awsome! Nice job.
I notice the STL files are slightly different from the model in the pictures at the end of one hinge.
In the STL files there is some interference between the arm, plate b I think, and the bearing mount ring. I guess that's the reason for the new arm design.
The attached picture is your STL files imported to autocad.
I have had the same idea for using a printed sarrus link for the z axis but haven't got any designs for it yet. Good to see other people working on it.
Stiffness: If you hold one end and push sideways (at a right to the axis of motion), that end moves and rotates. This is because the hinge plates twist slightly. It is not due to hinge looseness. Unfortunately, imperfections in a drive rod (bends, imperfect bearing, etc) push in just this way. Any sideways motion should be less than 0.1mm to achieve the reprap accuracy. Using 4 units would make it four times stiffer, I suppose, but I am working on a better idea.....
I use Art of Illusion. It is not a CADprogram, but I have learned to use it. It is certainly easier than Blender. I have had the best results with version 2.7. I use the solid editor plugin "simplify mesh" function to keep the number of triangles in the object from exploding exponentially.
What's the problem with stiffness? Is it twisting about the Z axis, deflecting about the X or Y axes or both? It seems to me that one could solve these problems by printing four of these and putting them on corners of the print bed, though I may not understand the problem here...
Also just out of curiousity, what CAD software did you use to design this?
I always wondered how those crushing walls in cartoons worked... you know where the hero (i.e.:Inspector Gadget or Penny and Brain) gets trapped and the arch villain (i.e.: Dr Claw) is laughing hysterically? Thank you for filling in that cartoon magic gap!
I will add this to my list of likes and replicate this design 20X it's original size some time in the future for my own evil lair :-D