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Britain02Germanyc 

Vs = 0

 

There are big drills   15,43 meter ( tunnel-drill for the crossing of Jangtse-River in Shanghai)

and small drills        0,05 millimeter ( thickness of an average hair is 0,07mm )

 

It is a general fact for both drills however

that the cuttingspeed in their centers is zero.

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