mathematical figures are obtained. Remember, bend

allowance is measured from the inside of the bend but

To compute bend allowance, you must know two

is computed along the neutral axis of the material being

primary facts: the radius of the bend and the degree of

used. Therefore, when calculating bend allowance, add

angle in the bend. Usually, this information can be

the bend radius to one-half of the thickness of the metal.

This will determine the radius of the neutral axis.

found on your blueprints or drawings.

Bend allowance is the product of the radius of the

As you study the following examples, refer to figure

neutral axis of the bend which is multiplied by the size

13-49 to help you understand where and how the

13-42