| In John's words "I would say the limit for a
clean
90deg. fold is 1.2mm half hard aluminium. Annealing the alum sheet along the
intended fold line may well extend the folded thickness, but as I'm only
working with 1.2, I've not bothered to anneal. Essential the work be very
firmly held evenly along the entire length of the fold which might require
some holes drilled through the bench top (ouch!) for some finger clamps. I
managed to get away with one serious 50 x 50 RHS finger clamp to the centre
of the sheet and the one each adjustable G-clamp at each end holding down a
100 x 50 RHS bar. All a bit fiddley initially, but after one successful
fold, it is a piece of cake." |
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