Raw hard metal materials

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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