Sheet Metal K-Factor (What it is & How to Measure)

Learn what a K-factor is in sheet metal forming, learn how K-factor is used, and learn how to calculate K-factor in this video.

K-factors are a great tool for developing flat blanks for sheet metal forming. However, I have noticed many people do not have the best understanding of what K-Factors are, how to derive them, and how to properly use them.

K-Factors are affected by every forming variable: Material type, grade, thickness, forming method, tooling, bend angle, etc. Changing any of these things can change the K-factor of a bend. For this reason we should be careful when using generic K-factor tables. We should always do testing to verify the the K-factor given any combination of these variables.

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Photo Credits (NONAFFILATED)
K Factor table:
https://www.thefabricator.com/article...
Bending example:
http://kaast-usa.com/press-brakes-exp...
Rad Gauge:
https://www.thefabricator.com/article...
Caliper:
https://www.amazon.com/Fowler-Stainle...