Bending sheet metal looks, at first glance, like a simple and quick operation. In reality the time it takes varies a great deal with the precision required, the thickness of the material and the complexity of the bend sequence — variables an accurate quote should always account for.
Tight tolerances cost time
When a product calls for angles and dimensions held to tight tolerances, bending time rises: more intermediate checks, occasional corrections, a slower pace than a bend with wider margins. Quoting precision work and standard work identically understates the former.
Thickness and bend sequence
Thicker materials need more powerful machines and longer setup. The sequence matters too: a piece with several bends in different directions needs more passes and more total time than a piece with a single simple bend, even at the same finished size.
Reflecting complexity in the time you quote
A practical way to avoid understating this is to classify bending work by complexity — simple, medium, high precision — and attach a different reference time to each level, rather than using one estimate for every bend.