Derive the following formulas relating die load W and the force P exerted on the handle of the jack discussed in Sec. 8.6. (a) P =(Wr/a) tan (θ+ ϕs) to raise die load; (b) P =(Wr/a) tan (ϕs – θ), to lower the load if the screw is self-locking; (c) P =(Wr/a) tan .(θ – ϕs), to hold the load if the screw is not self-locking.
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