[Alberg30] aluminum 6061 t-6

[chrishardy]

You could machine the 6061 with a good quality router like a porter 
cable 3.5 hp with the speed adjustment, use a solid carbide two flut 
centercutting end mill and 10000rpm setting, cut only about 1/8" per 
pass. For the mast beam I'd use a 1/2" bit with a plywood pattern, 
cutting .125 deep per pass. I cut marine electrical panels with a cnc 
router with 1/8" bit at 6 inches per minute travel speed and coolant 
spraying on the bit. Works great-- 5052 aluminum is way too gummy and 
fouls the bit which then breaks. Even without coolant you should be able 
to machine the thick mast beam material without generating enough heat 
to draw out the temper..... 

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