You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.
Bend radius sheet metal thickness.
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The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.
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Determine your minimum bend by measuring the distance from your closest feature i e.
Crca inside bend radius equal to 0 65 times of sheet thickness is also enough.
Recommended inside bend radius for sheet metal parts should be equal to material thickness.
We want to know the final length of the detail.
Another way to determine the k factor is by following the rule of thumb.
The bending angle is 90 sheet thickness 5 mm and the inside radius is 6 mm.
So if the metal plate is 75 thick you would multiply 4 x 75 3 so your minimum inside bend radius would be roughly 3 times the thickness of the material in this case or 2 25.
However it is important to know that this is just a broadly applicable rule of thumb you can follow for making bends in steel.
A cutout or the edge of your flange to your bend.
But for harder materials e g.
First we must start with the k factor.
The material thickness will be measured in decimal form not by the gauge number.