Quote:
Originally Posted by Cory
This is somewhat misleading.
6063-T6 has a 15% lower yield (35 ksi vs 40 ksi). Two identical cross sections in 6061 and 6063 have the same stiffness because stiffness is a product of Young's Modulus (which is basically 10,000 ksi for all aluminum alloys). Welded joints will be 40% weaker than in 6061, but any annealed aluminum is already incredibly weak regardless of alloy.
Our experience using square/rectangular tubing is that there is no difference. Quality 6063 should machine more easily than 6061, but I know that 973 has gotten some before that was far gummier than even 6061 (which is an impressive feat).
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I read 30ksi for 6063.
Oh whoops, totally forgot about the modulus.
Both have milled well for me... it's aluminum anyway. It's when you get to the lathe that there's a hassle involved.
EDIT: Could be lower than 30ksi depending on where you buy. McMaster has two different tempers available (but I don't usually buy from there).