Difference between revisions of "Robot Arm"

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<div style="text-align: right;">Click on image for larger view.</div>
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[[File:RobotArms.jpeg|200px|thumb|right|Image of robot arms]]
 
==Teams - Score==
 
==Teams - Score==
 
Best Score Achieved (smaller is better).
 
Best Score Achieved (smaller is better).
*[[Team F]] - ?
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*[[Team F]] - .17 mm-in^3
 
*[[Team G]] - .14959 in^3
 
*[[Team G]] - .14959 in^3
*[[Team H]] - ?
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*[[Team H]] - .182 mm*in^3
 
*[[Team J]] - 0.199mm-in^3
 
*[[Team J]] - 0.199mm-in^3
 
*[[Team K]] - .145597 mm-in³
 
*[[Team K]] - .145597 mm-in³
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*[[Team Q]] - .148 mm-in^3
 
*[[Team Q]] - .148 mm-in^3
 
*[[Team R]] - 0.167 mm*in³
 
*[[Team R]] - 0.167 mm*in³
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==Testing - Results==
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{| class="wikitable" | border="1" | cellspacing="0" | align="center"
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|-
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! Team !! Predicted Deflection (5N) !! Measured Deflection (5N)  !! Ratio
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|-
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| F || 1.45 mm || 1.83 mm|| 0.79
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|-
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| G || 0.75 mm || 1.50 mm || 0.55
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|-
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| H || 1.05 mm|| 1.15 mm || 0.91
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|-
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| J || 1.20 mm || 1.87 mm || 0.64
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|-
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| K || 0.90 mm || 2.00 mm || 0.45
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|-
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| L || 0.65 mm || 1.28 mm || 0.51
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|-
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| P || 0.975 mm || 2.45 mm || 0.40
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|-
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| Q || 0.985 mm || 2.45 mm || 0.68
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|-
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| R || 0.96 mm || 1.86 mm || 0.52
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|-
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| Mickey Mouse || 3.1 mm || 3.3 mm || 0.95
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|}
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The ratio between calculated and measured deflections has an average of 0.69 (with a standard deviation of 0.22).  The number used for the Young's modulus of the ABS plastic was 2.0 GPa.  Since measured deflections were consistently higher than calculated (by a factor of 0.69) a Young's modulus of 2*0.69=1.38 GPa would be more accurate.

Latest revision as of 14:00, 22 October 2012

Click on image for larger view.
Image of robot arms

Teams - Score

Best Score Achieved (smaller is better).

Testing - Results

Team Predicted Deflection (5N) Measured Deflection (5N) Ratio
F 1.45 mm 1.83 mm 0.79
G 0.75 mm 1.50 mm 0.55
H 1.05 mm 1.15 mm 0.91
J 1.20 mm 1.87 mm 0.64
K 0.90 mm 2.00 mm 0.45
L 0.65 mm 1.28 mm 0.51
P 0.975 mm 2.45 mm 0.40
Q 0.985 mm 2.45 mm 0.68
R 0.96 mm 1.86 mm 0.52
Mickey Mouse 3.1 mm 3.3 mm 0.95

The ratio between calculated and measured deflections has an average of 0.69 (with a standard deviation of 0.22). The number used for the Young's modulus of the ABS plastic was 2.0 GPa. Since measured deflections were consistently higher than calculated (by a factor of 0.69) a Young's modulus of 2*0.69=1.38 GPa would be more accurate.