It has been stated here that k-factor is relitivly amune from
bend angle. Yet the SW k-factor bend table is set up for bend angle
increments of 15 degs.

Is anyone using the k-factor bend tables? Most everyone I have talked to are entering k-factors manualy.

Also - the rule of thumb method for k-factor based on the ratio of radii/thickness, and increasing with material hardness. But many of the samples I have seen have Aluminum at higher k-factors than steel. Can anyone explain this?

Is anyone using the k-factor bend tables? Most everyone I have talked to are entering k-factors manualy.

Also - the rule of thumb method for k-factor based on the ratio of radii/thickness, and increasing with material hardness. But many of the samples I have seen have Aluminum at higher k-factors than steel. Can anyone explain this?

http://www.sheetmetalguy.com/

This will give you some basics on bending metal.

Also if you can get it from SME or Ebay, the SME book "Die Design Handbook' is a dull read but has tons of info on die design and bending metal.

We hand type all our k-factors in. It is takes the same amount of time as selecting from a table. Bending metal is also very much an art form and our selection of k-factor for any process is drawn from our experience for the type of part, tolerances required, material being used, forming process, etc.

Cheers,