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

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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MECH 325 5 Torque Relationships Express the driving forces in terms of other known variables: With some simple geometry, and noting that the driving force (P R or P L ) is actually a torque (T R or T L ) acting at a distance, we get the two characteristic torque equations 22 mm RL Fd fd l Fd fd l
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online