Press-Brake Max Bendable Thickness
The inverse of the press-brake tonnage tile: the thickest material a press can air-bend, T = sqrt(tons x V / (575 x (UTS/60) x L)). A 100-ton press with a 0.5 in V-die over a 4 ft bend in mild steel tops out at ~0.147 in; stronger stainless drops to ~0.120 in. Air bending only - bottoming and coining need several times the tonnage. The die maker's chart governs.
Formula and source
T = sqrt( total_tons x V / (575 x (UTS/60) x L) ), the air-bend tonnage rule tons/ft = 575 x (UTS/60) x T^2 / V solved for the thickness; recommended die ~8 x T.
Press-brake air-bend tonnage formula (the 575 mild-steel constant) solved for the thickness, as published in press-brake tonnage charts / Machinery's Handbook, by name; empirical method.
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