bumper angle??

[1993fordexploere]

ok so i want to cut an angle and hot bend my metal for my bumper but the problem is is how do i know how much to cut out?? any one want to tell me an equasion or some way to do it.

 

[Tbars4]

...You might make a mock up out of cardboard...This can save you on trial and error...

 

[dogfriend]

Or buy a solid modeling program like SolidWorks and draw it in 3D. :

 

[DB_1]

...You might make a mock up out of cardboard...This can save you on trial and error...

This method works great and gives you a feel of how it will look then you can tweak your design from there if need be. I like using 1/4" masonite since it's more rigid than cardboard but still easy to work with.
As far as angles go there's no hard fast rules, most people use the body contour and approach/departure angle as guidelines.