There is significant research into overconstrained 6, 7, 8+ bar linkages. For reference, an overcostrained 4 bar linkage is quite common, your standard “4-bar

There is significant research into overconstrained 6, 7, 8+ bar linkages. For reference, an overcostrained 4 bar linkage is quite common, your standard “4-bar linkage”. The fun continues as you add more and more linkages. I’m no expert, but I understand that there is no closed method for determining viable overconstrained sets past 4. So the research has a large amount of analytical/exploratory research. Very active field: https://www.google.com/search?client=safari&hl=en-us&ei=1bvkXO38NMn4-wT4yI2oBQ&q=6r+linkage+mechanism+research&oq=6r+linkage+mechanism+research&gs_l=mobile-gws-wiz-serp.3..30i10.6646.10733..10838...5.0..1.275.2244.0j7j5......0....1.........0i71j33i10.YxFTklqQTw4 https://www.google.com/search?client=safari&hl=en-us&ei=1bvk...