The accuracy of the cutting edge geometry influences the finished dimensions and surface roughness of components.
When finishing machining moulds, a good surface finish can reduce the subsequent polishing time. To achieve this, high cutting edge geometry accuracy is required, especially for ball nose and radius end mills.
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Ball nose end mills:
Radius end mills:
The table to the right shows the cutting edge geometry accuracy of ball nose end mills.
A high precision type has a radial tolerance within ±0.005mm as shown in the image below.
Ball nose end mills: High precision type
The high precision type can produce superior surface finishes (a) when compared to general products.
Ball nose end mills: Indexable insert
Some indexable insert ball nose end mills have a high radial tolerance equal to that of solid end mills. By using these, a better surface finish as shown in the graph can be obtained.
The table below shows the cutting edge geometry accuracy of corner radius end mills.
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The table below shows the cutting edge geometry accuracy of corner radius end mills.
- Click on the links to learn more!
Additionally, when machining moulds with a corner radius end mill as shown in the image below, a large diameter ball nose end mill is used for machining the flat and curved sections and a small diameter ball nose end mill is used for finishing the corner radius. However, replacing them with a single large diameter, high accuracy, corner radius end mill will allow machining of the whole component including the corner radius and reduce the number of tools used.
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