Robot Arm
From ENGR005_2012
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Teams - Score
Best Score Achieved (smaller is better).
- Team F - .17 mm-in^3
- Team G - .14959 in^3
- Team H - .182 mm*in^3
- Team J - 0.199mm-in^3
- Team K - .145597 mm-in³
- Team L - 0.124063 or 0.12 mm * in^3 (2 significant figures).
- Team P - .195 mm*in^3
- Team Q - .148 mm-in^3
- Team R - 0.167 mm*in³
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.