Quote:
Originally Posted by Sperkowsky
Oh! I just thought the metal our waterjet sponsor used had a weird composition. He did supply us with free 7075 aluminum parts once though so it didn't seem that far off.
Why does it do that?
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It's because water jetting doesn't rely on the water to cut, but rather the abrasive that is mixed in with the water. This means you'll get a more dull and speckled edge instead of the shiny edge like you would from an endmill or chop saw blade that relies on a sharp cutting edge.