Utilisé pour comparer visuellement et au touché la rugosité obtenue sur une surface métallique par différents procédés de fabrications, usinages et décapages en conformité à la norme BS 2634. Livrée dans une pochette sans certificat. Le tableau ci-dessous indique les différents modèles disponibles à la demande.
| Item Number | Machining Method | Number of Patches | Ranges of roughness values | |||
| Ra (µin) | Ra (µm) | N-groups | ||||
| 115 | Rectification de surface | 8 | 1 to 125 | 0.025 to 3.2 | 1 to 8 | |
| 116 | Rectification cylindrique | 8 | 1 to 125 | 0.025 to 3.2 | 1 to 8 | |
| 117 | Rodage à plat | Croisé / parallèle | 4 | 1 to 8 | 0.025 to 0.2 | 1 to 4 |
| 4 | 1 to 8 | 0.025 to 0.2 | 1 to 4 | |||
| 118 | Rodage cylindrique | 8 (4+4) | 1 to 8 | 0.025 to 0.2 | 1 to 4 | |
| 119 | Surface tournée | 8 | 16 to 2000 | 0.4 to 50.0 | 5 to 12 | |
| 120 | Tournage cylindrique | 8 | 16 to 2000 | 0.4 to 50.0 | 5 to 12 | |
| 121 | Fraisage | 8 | 16 to 2000 | 0.4 to 50.0 | 5 to 12 | |
| 122 | Alesage, perçage | 8 (4+4) | 16 to 125 | 0.4 to 3.2 | 5 to 8 | |
| 63 to 500 | 1.6 to 12.5 | 7 to 10 | ||||
| 123 | Fraisage horizontal | 7 | 32 to 2000 | 0.8 to 50.0 | 6 to 12 | |
| 125 | Shaping | 7 | 32 to 2000 | 0.8 to 50.0 | 6 to 12 | |
| 126 | Ponçage à la bande | 6 | 4 to 125 | 0.1 to 3.2 | 3 to 8 | |
| 128 | Rectification verticale | 6 | 8 to 250 | 0.2 to 6.4 | 4 to 9 | |
| 129 | Sablage | 6 | 16 to 500 | 0.4 to 12.5 | 5 to 10 | |
| 058 | Grenaillage | 6 | 16 to 500 | 0.4 to 12.5 | 5 to 10 | |
| 131 | Electroérosion | 7 | 16 to 1000 | 0.4 to 25.0 | 5 to 11 | |
| 133 | Limage | 5 | 16 to 250 | 0.4 to 6.4 | 5 to 9 | |
| 134 | Fonderie | 7 | 32 to 2000 | 0.8 to 50.0 | 6 to 12 | |
| 135 | Honing (finition d'alédage) | 6 | 2 to 63 | 0.05 to 1.6 | 2 to 7 | |
| 136 | Polissage | 5 | 0.5 to 8 | 0.0125 to 0.2 | 0 to 4 | |
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