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325-lec-6-power screw analysis (annotated)

325-lec-6-power screw analysis (annotated) - MECH 325 Power...

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MECH 325 Power Screw Analysis MECH 325 2 Objectives By the end of today’s class, you should be able to: Calculate torque for various power screw applications Describe the characteristic of self-locking and determine conditions necessary for self-locking Describe and quantify the effect of the thread type and nut on raising and lowering torque Analyze power screw thread stress MECH 325 3 Stresses Sketch the stress distribution present on the screw threads for an axial load F on the nut and a torque T on the screw F T MECH 325 4 Origin of Power Screw Torque Complete the diagrams (represent stresses and torques as point forces on the unrolled incline planes) Raising Load Lowering Load
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