# Difference between revisions of "Robot Arm"

From ENGR005_2012

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+ | <div style="text-align: right;">Click on image for larger view.</div> | ||

+ | [[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]] - .17 mm-in^3 | *[[Team F]] - .17 mm-in^3 | ||

*[[Team G]] - .14959 in^3 | *[[Team G]] - .14959 in^3 | ||

− | *[[Team H]] - . | + | *[[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 | ||

+ | |||

+ | ==Testing - Results== | ||

+ | {| class="wikitable" | border="1" | cellspacing="0" | align="center" | ||

+ | |- | ||

+ | ! 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. |

## Latest revision as of 14:00, 22 October 2012

Click on image for larger view.

## 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.