D3A Dish Mechanical Design

Metrology Results

Results from laser tracker measurements.

Dish 1

This plot shows the deviation from the CAD file.

• 3D RMS error 0.4025 mm pointed at zenith
• Large ring is printed through the surface
• Peak error ±1.7 mm

Dish 2

This plot shows the deviation from the CAD file.

• 3D RMS error 0.74 mm pointed at zenith
• No print through from the ring addition. RMS error is worse than Dish 1.
• Peak error +2.3 mm

This plot shows the deviation from a best-fit parabola.

• 3D RMS error 0.326 mm pointing at zenith
• No print through from the ring addition. RMS error is close to Dish 1.
• Peak error −1.4 mm