Abstract
We requested 3D measurement of Ncal weights, and the measurment was done.
Details
We requested the Mecdidhanical Engineering Center（機械工学センター） at KEK to conduct 3D measurement using Coordinate Measuring Machine (CMM) of twelve copper weights (Ø50.1mm, height 50mm)in picture 2 used for NCal and one aluminum weight (Ø50.1mm, height 50mm) in picture 3 made from excess material left over during the fabrication of the NCal disk. The measurements were performed using a UPMC 850 (ZEISS) in picture 1.
The measurement was conducted using a contact probe, employing the radial method. Since the aluminum weight was too light, a fixture was used to prevent it from moving when touched by the probe. Due to this setup, the measurable points on the aluminum weight were limited, making it impossible to calculate roundness. Instead, the standard deviation was determined.
And roundness were measured at two point. Point are 10 mm and 40 mm from the floor of UPMC 850.
The results are as follows.
To prevent from using wrong terms, I wrote down a tabel in japanese. Sorry.
| ナンバリング | 直径 | 平行度 | 真円度_h-40 | 真円度_h-10 | 温度(°C) |
|---|---|---|---|---|---|
| 1 | 50.0740 | 0.0468 | 0.0128 | 0.0094 | 22.2 |
| 2 | 50.0582 | 0.0446 | 0.0357 | 0.0157 | 22.5 |
| 3 | 50.0826 | 0.0556 | 0.0138 | 0.0081 | 22.5 |
| 4 | 50.0999 | 0.0658 | 0.0179 | 0.0087 | 22.4 |
| 5 | 50.0999 | 0.0539 | 0.0169 | 0.0103 | 22.7 |
| 6 | 50.0727 | 0.1072 | 0.0164 | 0.0167 | 22.5 |
| 7 | 50.0851 | 0.0500 | 0.0182 | 0.0118 | 22.4 |
| 8 | 50.1456 | 0.0958 | 0.0102 | 0.0134 | 22.5 |
| 9 | 50.0856 | 0.0423 | 0.0068 | 0.0095 | 22.5 |
| 10 | 50.0486 | 0.0548 | 0.0084 | 0.0137 | 22.2 |
| 11 | 50.1332 | 0.0714 | 0.0164 | 0.0093 | 22.3 |
| 12 | 50.1086 | 0.0594 | 0.0069 | 0.0102 | 22.4 |
| 13(Ai) | 50.0498 | 0.0560 | 0.0328 * | 0.0378* | 22.2 |
