Another way to determine the k factor is by following the rule of thumb.
Good thickness for bending sheet metal.
If you re bending 0 020 thick material use a 0 020 radius.
To ascertain your k factor inside radius and material thickness expressed as a decimal you should use an bend.
Mark a bend line and place the sheet metal on the edge of your bench.
For most applications with stainless steel or aluminum you can get away with a zero radius bend on anything under 0 050 thick.
When slotting sheet metal at the bend axis the material s average density in the bend region is decreased.
In other words if you re bending 1 8 sheet use a tool with a 1 8 radius to form the inside of the bend.
We want to know the final length of the detail.
Keep in mind that some metals are more brittle than.
Next place the wood parallel and slightly behind the bending line.
It just won t really be at maximum strength.
As an example if you want to bend 24 gauge sheet metal at a 90 angle the calculation would be.
0 017453 x 90 x 0 020.
Finally bend the sheet up by hand to the angle desired.
The sheet metal bending height should be at least 2 times the thickness of the sheet metal plus the bending radius that is h 2t r.
If you want a sharp 90 bend tap along the crease with a mallet.
The bending angle is 90 sheet thickness 5 mm and the inside radius is 6 mm.
Wilson and fine 1981 studied the effect of sheet metal thickness ranging from 0 5 mm to 1 4 mm on fatigue performance.
Clamp the wood on top of the metal to the workbench.