[FWB]

hmm, Paul what temper aluminum are you bending there? looks like AMS 4027 T6
6061-T6, if thats correct stop, as the beds will crack on you T-6 can't be bent to that small of a radius and not crack under load. i wouldn't go over T-4, if you want the finished product to be T6 then stick the alum piece after its bent in the oven at 350
for 24 hours to age to T6

looks like for .040 T6 rad no less than .060