|
|
| Roughness value Ra (μm) | 50 | 25 | 12.5 | 6.3 | 3.2 | 1.6 | 0.8 | 0.4 | 0.2 | 0.1 | 0.05 | 0.025
| Roughness value Ra (μin)
| 2000
| 1000
| 500
| 250
| 125
| 63
| 32
| 16
| 8
| 4
| 2
| 1
| Roughness grade number
| N12
| N11
| N10
| N9
| N8
| N7
| N6
| N5
| N4
| N3
| N2
| N1
| Roughness grade symbol
| ~
| V
| VV
| VVV
| VVVV
| Flame cutting
| -----
| -----
| -----
|
|
|
|
|
|
|
|
|
| Snagging
| -----
| -----
| -----
| -----
|
|
|
|
|
|
|
|
| Sawing
| -----
| -----
| -----
| -----
| -----
| -----
|
|
|
|
|
|
| Planing, shaping
|
| -----
| -----
| -----
| -----
| -----
| -----
|
|
|
|
|
| Drilling
|
|
| -----
| -----
| -----
| -----
|
|
|
|
|
|
| Chemical milling, Elect. discharge mach
|
|
| -----
| -----
| -----
| -----
|
|
|
|
|
|
| Milling
|
| -----
| -----
| -----
| -----
| -----
| -----
| -----
|
|
|
|
| Broaching, Reaming
|
|
|
| -----
| -----
| -----
| -----
|
|
|
|
|
| Electron-beam, laser
|
|
|
| -----
| -----
| -----
| -----
| -----
|
|
|
|
| Electro-chemical
|
|
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| -----
|
|
| Boring, turning
|
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| -----
|
| Barrel finishing
|
|
|
|
| -----
| -----
| -----
| -----
| -----
| -----
| -----
|
| Electrolytic grinding, Roller burnishing
|
|
|
|
|
|
| -----
| -----
| -----
|
|
|
| Grinding
|
|
|
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| -----
|
| Honing
|
|
|
|
|
| -----
| -----
| -----
| -----
| -----
| -----
|
| Electro polish
|
|
|
|
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| Polishing
|
|
|
|
|
| -----
| -----
| -----
| -----
| -----
| -----
| -----
| Lapping
|
|
|
|
|
|
| -----
| -----
| -----
| -----
| -----
| -----
| Superfinishing
|
|
|
|
|
|
| -----
| -----
| -----
| -----
| -----
| -----
| Sand casting, Hot rolling
| -----
| -----
| -----
|
|
|
|
|
|
|
|
|
| Forging
|
| -----
| -----
| -----
| -----
|
|
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|
|
|
|
| Perm mold casting
|
|
|
| -----
| -----
| -----
|
|
|
|
|
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| Investment casting
|
|
|
| -----
| -----
| -----
| -----
|
|
|
|
|
| Extruding
|
|
| -----
| -----
| -----
| -----
| -----
|
|
|
|
|
| Cold rolling, Drawing
|
|
|
| -----
| -----
| -----
| -----
| -----
|
|
|
|
| Die casting
|
|
|
|
| -----
| -----
| -----
|
|
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| | |||||||