Quote:
Originally Posted by Cory
Corner radius is always preferred if you don't need a square shoulder. The number one reason end mills go bad is the corners of the flutes chip and then the cutting edge gets destroyed. Corner radii help prevent this.
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I thought I'd revive this excellent thread from the dead. Getting ready to purchase some new tooling, and I see there are usually several options for the amount of corner radiusing. For example, Maritool offers .008, .015, .030, .060, and .090 radius options for a 1/2" endmill. Never having purchased one I'm not sure why to choose one over the other. I'm assuming that the biggest radius will lengthen tool life the most, and since we are mostly doing thru-cuts on everything the radius will never have an impact on the cut geometry. Anyone care to elaborate on this?