2.72 group 5 design review 1 2/23/08 eric correll, josh gafford, andrew marecki, stephen powelson,...
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![Page 1: 2.72 Group 5 Design Review 1 2/23/08 Eric Correll, Josh Gafford, Andrew Marecki, Stephen Powelson, Johannes Schneider, Sam Weiss](https://reader036.vdocuments.us/reader036/viewer/2022081519/56649d5f5503460f94a3ecb0/html5/thumbnails/1.jpg)
2.72 Group 5
Design Review 1
2/23/08Eric Correll, Josh Gafford, Andrew Marecki, Stephen Powelson, Johannes Schneider, Sam Weiss
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2.72 Group 5 - Spring 2009 2
Objective
Project timeline and updates Introduce shaft design Calculations, diagrams, and results Further discussion
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GANTT Chart
…wait one second…
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Individual Updates
Steve – Solid Model Sam – MathCAD Eric – Machining Andy – Documentation Josh – FEA Johannes – Measurement
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Measurement
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Shaft Design
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CalculationsSe ka kb kc kd ke kf Sut 206.87MPa
0 2 4 61 10
3
0
1 103
2 103
YX
Position (in)
She
ar (
N)
0 2 4 620
0
20
40
60
80
100
YXTotal
Position (in)
Mom
ent (
N*m
)
max M( ) 88.9N m
Typical cutting force: 500N
Part yield at ~1000N
(3/8” Al, cut 1.25” from chuck)
Tensioning force from pulley,
2 to 3kN max
0 2 4 60
0.5
1
1.5
Shaft Diameter
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Safety Factor
0 2 4 60
1
2
3
4
5
Safety FactorShaft Diameter (in)Stress (Rel. to max)Safety=1Safety=1.5
Minimum safety factor given stress concentrations is n=1.3
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Deflections and Angles
0 2 4 6
2 103
2 103
4 103
6 103
Y deflection (in)X deflection (in)
0 2 4 6
0.15
0.1
0.05
0.05
0.1
Y angleX angle
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Deflections and Angles (cont.)
0 2 4 6
2 103
2 103
4 103
6 103
Y deflection (in)X deflection (in)
0 2 4 6
0.15
0.1
0.05
0.05
0.1
Y angleX angle
FEA confirms MathCAD analysis. Compare FEA of solid model (above) with MathCAD calculated deflection (in red, right).
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Questions
Is the bearing order only for the spindle bearings?
Chuck fitting and size? Motor specs (torque-speed curve)? Motor mounting fixture? Pulley tensioning?