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Yikes... I'm having a huge brain-fart and need help with some really embarrassingly basic physics for a real world engineering application.

Basically, I'm clamping a drafted part and I'm concerned that the wedging force will pop it out of the fixture. I'm trying to ultimately find F_z, or the force necessary to pull it out of the "vise" or UP as shown in the picture.

Variables:

Static Coefficient of Friction on Both Surfaces (mu) = ~0.5

Draft Angle (θ) = 0-15 deg (variable)

Clamping Force (F_x) = ??? lbs.

Weight of Part (mg) = 1-10 lbs.

I think that's all the variables I need to define F_z, but I'm pretty sure my equation is way off and Newton would kill me:

F_z = [mg+2*mu*F_x*(cos(θ))^2]-[2*F_x*sin(θ)*cos(θ)]

Close? Wrong?

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# Clamping Problem (Wedge & Friction)

Can you offer guidance or do you also need help?

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