does the K factor calculator correct?

[Anonymous]

Anyone can tell whether the following online K factor calculator correct?

https://www.machinemfg.com/k-factor-calculator/

Your feedback will be appreciated.

[Anonymous]

No, it does not. It doesn't take into account how the material behaves during bending.

Working in a factory dealing with *a lot* of sheet metal, I always unfold Stainless Steel 3mm using K27 (which means 0mm bend addition), while drawing it 3mm thick and 3mm bend radius.

The calculator tells me to use K41, because it apparently expects it to become 0,7 mm shorter, which corresponds better with regular steel than stainless steel.

[Anonymous]

Our bending table is based on bend tests.

We've taken a 100mm piece of material and bent it in the middle for 1-12 mm for alu, Stainless and steel, and we've used different tools for multiple tests, so we know by experience how to draw and calculate our unfolds within our factory.

Therefore our bending table may be different from other factories' bending tables, and as such, K27 for stainless steel works for us, but may not work for others. It was just an example of two materials behaving differently, and your calculator not taking that into account.