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Eccentric Clamping Force - Formula

Eccentric Clamping Force - Formula

Eccentric Clamping Force - Formula

(OP)
Sirs:

In McGraw-Hill’s Machining & Metalworking Handbook I found the following formula for the clamping force by a round eccentric:

P = Q l . l/[tan(?+?1) +tan(?2)]r

Where:

•    r: Distance from pivot point to contact point of the eccentric and the machined part surface
•    ?: Rotation angle of the eccentric at clamping
•    tan(?1): Friction coefficient at the camping point
•    tan(?2): Friction coefficient at the pivot axle.
•    l: Handle length.
•    Q: Force applied to the handle.
•    P: Clamping force

As I have some doubts that the formula is correctly typed (in the book), can someone confirm if it is right? or, better,  inform  where can I find its  deduction?


Thank you,


Julio

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