Bend
Allowances
Bend allowance is the amount of metal to be added to the total
layout. The most important considerations when bending
metal is the min. bend radius. When bends are made smaller
than the required min. radius, metal will crack at the
outside heel of the bend. The min. radius
of a bend is determined by the hardness and thickness
of the metal. There are four methods for finding bend
allowances. In the form below uses the empirical
formula. It is the most accurate because it takes into
account the shifting of the neutral line, slightly inward,
when the metal is bent. The following form must be filled
in with decimal equivalants.
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