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Four Bar Linkage Design Help
sparky961:
Can anyone tell me if a four bar linkage can be made in such a way that something attached to one of the bars can be made to orbit around a known, fixed point? I know... it's hard to visualize. I'm trying to think up a way to have a "virtual" pivot point in a mechanism, without having any connections at that point.
In the attached (very) quick sketch, C is the centre point what I want X to rotate around. X needs to be affixed to the base, B, by some sort of linkage, slide, or whatever. Y shows another position of X on the arc of travel. Nothing can be attached to C. Think of X as a cube or rectangular block with 3 dimensions.
Simple and rigid, with the ability to lock and unlock to reposition easily.
efrench:
It looks like you have the start of a design for a goniometer.
sparky961:
--- Quote from: efrench on March 08, 2017, 03:37:05 PM ---It looks like you have the start of a design for a goniometer.
--- End quote ---
Well, I had to Google that one... Good guess but try again. :)
In looking around tonight, I found the Peaucellier-Lipkin linkage, and thought that might be promising. But it still has a physical pivot point, which is what I'm trying to avoid.
Sorry for the Russian... the animations are nice though.
efrench:
This should satisfy your criteria: http://www.mekanizmalar.com/looney_gears.html :coffee:
sparky961:
Finally, I just came up with one candidate that could work. Maybe this will help to elicit other ideas too, seeing more what I'm after.
In the attachment, the dashed line shows an extension to the "virtual pivot point" that I mentioned earlier. I've included the same letters as I did in the original thread so you can see how it relates.
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