OUR MATERIALS - SURFACE FINISHES
Below are some very typical finishes that are required by our customers shown here to give you some guide to what is common to "World Quality Precision Engineers". They are Internationally recognised scales for finishes by different means of machining.
Generally the better the finish the higher the cost but sometimes the tolerance required calls for a high finish. Consider when choosing tolerances and finishes if working to a budget.
The Super, Fine, Good and General are only meant as a helpful guide for you.
| Centre Line Scale |
Micro Meters Scale |
Spark Erosion Scale |
Grinding B.S. Scale |
Finish Required For |
Finish Required For |
Finish Required For |
Finish Required For |
| "CLA" | "Ra" | "VDI" | "N" | Polishing | Grinding | EDM | Turning / Milling |
| 2 | 0.05 | -- | N2 | Super | -- | -- | -- |
| 4 | 0.10 | -- | N3 | Fine | -- | -- | -- |
| 8 | 0.20 | -- | N4 | Good | Super | -- | -- |
| 16 | 0.40 | 12 | N5 | -- | Fine | Super | -- |
| -- | 0.56 | 15 | -- | -- | Good | Fine | Super |
| 32 | 0.80 | 18 | N6 | -- | General | Good | Fine |
| 63 | 1.60 | 24 | N7 | -- | -- | General | Good |
| 125 | 3.20 | 30 | N8 | -- | -- | -- | General |
Spark Erosion is "Electro Discharge Machining" commonly known as EDM and is measured internationally by the VDI scale
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