bend allowance for odd shapes

[TheTick]

Any bending mavens out there know how to get the bend allowance for bending odd shapes like C-channel or angle iron?

 

[smcadman]

As for bending flat sheet metal, Bendworks is a great FREE tool. Not only can you calculate a bend deduction, you can also reverse engineer parts made in your shop and find the k-factor to be used at a later date.

Bendworks
k-factor formula and tips

Flores

 

[Gymmeh]

I tried two of the methods here with a part here and they were within 0.05"

 

[smcadman]

I tried two of the methods here with a part here and they were within 0.05"

How many bends were on your sample? If it was only 1 or 2 bends that would not fly here because we would be way out of tolerance on 6 bends.

Flores

 

[mcgyvr]

Just thought I would throw this in here.
The program is bendworks

http://www.ciri.org.nz/bendworks/

a super simple program for determining bend deductions,k factors,etc..
There is a nice part in the tools menu for reverse engineer k factor that I use all the time to get the right blank size for all press brake formed materials

 

[Gymmeh]

smcadman, sorry for lack of details, that’s sum of tolerances for four 90 degree bends in 0.5" plate. The part is later force fit into a part, then welded, and finally machined.

 

[smcadman]

smcadman, sorry for lack of details, that’s sum of tolerances for four 90 degree bends in 0.5" plate. The part is later force fit into a part, then welded, and finally machined.

4 breaks on 18 GA. C.R.S., I would not be impressed, BUT 4 breaks on 1/2" plate is very impressive.

Flores