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Crank Linkage

This crank linkage works, except I need to constrain the larger bone to the bone labeled "crank" so they behave as a solid link. When I add rigging to the tail of the larger bone, the larger bone is able to pivot at the juncture of the three bones. Parenting (Ctrl-P) doesn't seem to help...

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  • $\begingroup$ I am unsure as to your goals and problem. What are you ultimately trying to do, and what is happening instead? $\endgroup$
    – Kirbinator
    Commented Jun 17, 2018 at 17:45
  • $\begingroup$ I'm modeling a kinetic sculpture of a man pushing on a wall. The mechanism is shown in this short video: youtu.be/VCeFdhtJj6g $\endgroup$
    – Jeffrey Neil Willits
    Commented Jun 18, 2018 at 5:41
  • $\begingroup$ The upper end of the large bone will connect to other linkages, but it needs to stay rigid with the bone I labeled "crank". Link-1 needs to attach in the body of the link object I will model, instead of an end of the link. When I model the link object, it could be a child of either the bone labeled "crank" or the large bone, since they will have the same movement. $\endgroup$
    – Jeffrey Neil Willits
    Commented Jun 18, 2018 at 5:51
  • $\begingroup$ Could you upload your blend files here blend-exchange.giantcowfilms.com so I can try to help you? $\endgroup$
    – Tak
    Commented Jun 19, 2018 at 7:42

1 Answer 1

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I figured out a solution and it's really simple. Since the big bone has the same movement as the bone labeled "crank", I really don't need it. I made a link object the length of both "crank" and the big bone and made that a child of "crank". Then I made the origin of the link object at the top of where the big bone was and I built the second armature (not shown) off that point. Then I made the connecting bone copy the location of the link object.

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