How can a human dummy be constrained?

[wersy]

The Human Mannequin that uploaded @Warmingup1953  is a great design.
https://forums.autodesk.com/t5/fusion-360-design-validate/stuck-with-how-to-do-this-make-model-of-pe...

Unfortunately, you can't use it properly because it twists unnaturally.

It would be a great thing if it could be constrained to fit a human body.
Is there anyone who manages that?

[davebYYPCU]

Something Grounded and 

Joint limits, normally tame that sort of stuff.

Might help…..

[Warmingup1953]

Wow!....I've never contorted Harry like that before!

[TrippyLighting]

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@davebYYPCU wrote:

Joint limits, normally tame that sort of stuff.

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Have at it! Good luck!

[davebYYPCU]

Revert and Undo, if I had the file, but Undo will be lost now.

[jeff_strater]

a couple of suggestions:

1. while ball joints are probably fairly accurate, biologically, for human joints, I think there is room for a lot of simplification here, depending on how accurately you need to be able to position this thing.  Elbow, knee, ankle, body/"chest" (that's not what I call that part of my body, but whatever), you can probably get away with a Revolute joint, and get pretty close.  Ball joints are finicky things - too many degrees of freedom, and the joint solver is free to move whatever it wants.  What you show is a valid solution to a massively under-constrained system.
2. Joint limits, while probably a pain to apply, will help a lot from the thing twisting into the kinds of unnatural positions you show here.
3. don't try to position with component drag.  Ever, but certainly not in this model.  Use Drive Joint.  That tends to localize the modifications to just the joint in question.  It will be a bit more painstaking to get the position you want, but will be a lot like what you would do IRL to position a mannikin.