I'm looking for a purely-mechanical mechanism that will keep two rotating shafts at the same angle with a variable distance between them. The best ideas I've come up with so far are a pair of 4-bar mechanisms attaching to a third point or putting a keyed linear shaft through the two with bevel gears or universal joints, but is there anything better? I don't need full rotation, just 180 degrees. Any ideas?
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- It would be in the large distance category, based on those options. I'm working on an idea for a mechanism for graphing integrals and derivatives.2w
- I would definitely go with the two arm belt chain. Btw, May 15-19 I will have a group of kids in LA at the International science fair. In fact the student that made the cubic subdivision infill is coming with.2w
- The shafts are parallel? First thing that comes to mind is two belts tied to a shared third shaft, which floats halfway between and off to the side at the tip of a triangle made up of two links.2w
- Yeah, might end up going with that. Actually, for this purpose, spectra spools might make more sense. It's only turning about 180 degrees, so walking isn't an issue.2w
- When did 1-arm tests we used a single groove idler to redirect the string. I think you can get away with one string and one tensioner. I wouldn't suggest it for a production machine.
- For this purpose, I don't need a separate tensioner. It doesn't matter how long the arm is, so I can just adjust the length to tension it.2w