Difference between revisions of "Robot Arm"

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==Testing - Results==
 
==Testing - Results==
{| class="wikitable" | border="1" | cellspacing="0"
+
{| class="wikitable" | border="1" | cellspacing="0" | align="center"
 
|-
 
|-
 
! Team !! Predicted Deflection (5N) !! Measured Deflection (5N)  !! Ratio  
 
! Team !! Predicted Deflection (5N) !! Measured Deflection (5N)  !! Ratio  
 
|-
 
|-
| F || Example || Example || Example
+
| F || 1.45 mm || 1.83 mm|| 0.79
 
|-
 
|-
| G || Example || Example || Example
+
| G || 0.75 mm || 1.50 mm || 0.55
 
|-
 
|-
| H || Example || Example || Example
+
| H || 1.05 mm|| 1.15 mm || 0.91
 
|-
 
|-
| J || Example || Example || Example
+
| J || 1.20 mm || 1.87 mm || 0.64
 
|-
 
|-
| K || Example || Example || Example
+
| K || 0.90 mm || 2.00 mm || 0.45
 
|-
 
|-
| L || Example || Example || Example
+
| L || 0.65 mm || 1.28 mm || 0.51
 
|-
 
|-
| P || Example || Example || Example
+
| P || 0.975 mm || 2.45 mm || 0.40
 
|-
 
|-
| Q || Example || Example || Example
+
| Q || 0.985 mm || 2.45 mm || 0.68
 
|-
 
|-
| R || Example || Example || Example
+
| R || 0.96 mm || 1.86 mm || 0.52
 
|-
 
|-
| Mickey Mouse || Example || Example || Example
+
| 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.
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.