End Cutter

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What is "razor sharp custom ground end cutters"?

Hello.
In one book I have read that in some works I should use "razor sharp custom ground end cutters". I know what "razor sharp" states for but I don't know what is the meaning of "custom ground". Maybe it's a common tool (just an ordinary end cutters) but as a person that doesn't live in English-speaking country I'm not used to these terms.
So, is "razor sharp custom ground end cutters" a special kind of end cutters?

They are what's commonly known in America as End Mills. There are different types of clearance angles ground onto End Mills for cutting different types of materials. For example if you are cutting a one inch radiused channel through aluminum you would use a two flute End Mill where the end is ground to a full ball or a full radius. Whatever that end grind configuration is it will be imparted to the parent material during the cutting process. If you are cutting steel you would use at least a four flute end mill with the same custom ground shape.

Now if you are milling wood you would do the same type of grind to a router bit only the primary and secondary clearance angles would be greater to assist in a more dense stock removal.

Did I confuse you? If you want more clarity just update your question by saying what configuration you want to cut and what material you are cutting and what machine you will be using this cutter on.

Good luck on your project. And here is a link to the types of cutters I am referring to:
http://images.search.yahoo.com/search/images;_ylt=A2KJke5OqTVOU2oANDOJzbkF?p=radiused+end+mills&fr=&ei=utf-8&x=wrt&y=Search

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