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hans - taking the picture as a base - I do not see exactly what piece of this too/mechanism You want to face?
First - all components should be assembled by Connection, not Constraints
Second - almost all should have pin connection(only rotation)
Third - there is a place for a slider option
*fourth - spring can not be modeled if You consider her dynamic changes. There is an option in Mechanism to simulate spring but You have to have MDO
*fifth - You can change Joint axis settings to limit the movement of connections
any way I ohnestly advice You to check PTC web page - follow this link
Hans, not all components will be moving in this one as you need a ground. Looks like you will be using the pin connection on most joints combined with a planar connection. The cam operation can be modeled using the cam connection, its a pretty simple command to use ans you can select the surfaces of the goem.
The way I see it at the moment is you have 2 options, you can do all the pin connections and add the cam connection on the ovrhead cam and simply leav it at that, here you would have the motion properly defined. Or you could do the pins as before and add a pin connection to the overhead cam and check an option called lift of, this option allows the cam to seperate from the surfaces and would give a more realistic simulation of the grips, you would however also need to add a cam connection to the grips themselves with lift off to make the simulation complete, the compression however that is required is beyond me on this one, i'm sure that i could replicate the behaviour with a surface but would it be correct is the question.
I don't think you can simulate the {Reel} over center. All axis to axis
dimensions and constants can not be violated in mechanism. The vice
grip works because of bending/compressing of material. This is not an
option in Mech. You can though however fake it as the axis to axis
difference is very small.
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