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2.72 Group 5

2.72 Group 5. Design Review 1 2/23/08. Eric Correll, Josh Gafford, Andrew Marecki, Stephen Powelson, Johannes Schneider, Sam Weiss. Objective. Project timeline and updates Introduce shaft design Calculations, diagrams, and results Further discussion. GANTT Chart. …wait one second….

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2.72 Group 5

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  1. 2.72 Group 5 Design Review 1 2/23/08 Eric Correll, Josh Gafford, Andrew Marecki, Stephen Powelson, Johannes Schneider, Sam Weiss

  2. Objective • Project timeline and updates • Introduce shaft design • Calculations, diagrams, and results • Further discussion 2.72 Group 5 - Spring 2009

  3. GANTT Chart …wait one second…

  4. Individual Updates • Steve – Solid Model • Sam – MathCAD • Eric – Machining • Andy – Documentation • Josh – FEA • Johannes – Measurement

  5. Measurement

  6. Shaft Design

  7. Calculations Typical cutting force: 500N Part yield at ~1000N (3/8” Al, cut 1.25” from chuck) Tensioning force from pulley, 2 to 3kN max

  8. Safety Factor Minimum safety factor given stress concentrations is n=1.3

  9. Deflections and Angles

  10. Deflections and Angles (cont.) FEA confirms MathCAD analysis. Compare FEA of solid model (above) with MathCAD calculated deflection (in red, right).

  11. Questions • Is the bearing order only for the spindle bearings? • Chuck fitting and size? • Motor specs (torque-speed curve)? • Motor mounting fixture? • Pulley tensioning?

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