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whats the logic behind end mills tolerances?

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AviSprngr

Mechanical
Joined
Aug 16, 2012
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11
Location
IL
Hi,
I hope this is the right place to post this question.
Why does european tolerances for end mills diameter are derived from table of limilts and fits standard(e8 for example)
while inch size end mills for usa is mostely +0/-0.05 m"m on solid carbide end mills?
why does it need to be so tight if cnc operator will measure the diameter anyway before using it?
 
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