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02-04-2017 #11
Last Activity: 15-04-2017
Excuse me Boyan. I have doubt about this subject.
i see the hardness of some stone and metal in https://www.tf.uni-kiel.de/matwis/am...ed/t8_4_2.html
for example the hardness of Al is 25 Vickers hardness and the hardness of granite is 850 Vickers hardness. now we see that the hardness of some stone much more than Al and Fe.
now if we milling and engraving stone, then the force in chassis is much more rather than milling Al. what's your opinion about this subject?
thank's
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