Aren't those chips beautiful?? You guys should have seen the pile of shavings after using the facing mill for the first .400 thousandths! This is the 6061 I picked up the other day. Started as a 4"x3" flat bar stock. So far it's been great to work with! The 1" end mill
made easy work of getting through the material and left a beautiful surface finish. More than likely, these pieces will be powder coated anyways.
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I personally would not powder coat any of the heat treated aluminum alloys!
Unless you really know and trust the powder coater; to use short cycle times and very low temp powders Anything over 300 F for any length of time can remove or degrade the heat treatment / temper. If that happens you will lose roughly half of it strength.
I prefer hard teflon anodizing; as their is no weight gain, nearly no build up (0.001"-0.003" build up, and roughly the same amount of penetration) and it is much more durable and last longer than powder coat. Powder coat will start failing / peeling away within a few years. FWIW