Aluminum Grinding - Skin, Oil, and Oxidation

This video was intended to be a time lapse of the grinding of a clock face, but due to a mistake I made, the aluminum was ruined, now requiring a complete regrind. I explain what happened.
Music: Intro by Jon B.
Main/partial track: "Going Higher" by Bensound.com
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[@jimboh5131]

Thanks for sharing this.. .as a newbie this is the kind of invaluable information that is priceless. I for one really appreciate you sharing you skills and experiences.