A: contact point of castor
B: contact point of left wheel
C: contact point of right wheel
Coordinate frame:
XY plane on lower face of Aluminum frame
X middle point between wheels pointing forward
Z pointing upwards
Y pointing left to follow right hand convention
| Measured dimensions | x (mm) | y (mm) | z (mm) |
|---|---|---|---|
| A | 131 | 0 | -56 |
| B | 0 | 102 | -60 |
| C | 0 | -102 | -60 |
To calculate x coordinate of A:
l' ² + 102² = 166² -> l' ~= 131 mm
l²+4² = l'² -> l ~= 131 mm (no effect of the 4mm )
| Raised: 9.3mm | W_A (g) | W_B (g) | W_C (g) | Sum (g) |
|---|---|---|---|---|
| None | 545.7 | 708.8 | 641.3 | 1895.8 |
| A | 511.8 | 719.2 | 665.0 | 1896 |
| B | 586.5 | 684.0 | 624.8 | 1895.3 |
| C | 589.2 | 696.5 | 609.8 | 1895.5 |
W = 1895.7 g
Subtract weight of wheels: 45.4 g each on points B and C
Subtract weight of castor: 47.1g on point A
Result: 1757.8g