Sheet Metal Setback Formula

Sb k r t 0 2 inches.

Sheet metal setback formula.

The outside setback is the distance from the apex of the outside mold lines to the tangent point of the outside radius. Get to know them better to learn advance concept easily. When the sheet metal is bent the inside radius pulls the edge of the material away from the apex of the bend. Calculate the value bend allowance for required sheet metal bend by using below formula.

Bend allowance bend deduction 2 ossb. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. K 1 for a 90 bend. Bend allowance and deduction formulas are used for air bending.

Here end the fabrication formulas for sheet metal up next we ll be seeing some of the terminologies in sheet metal that you ll need. Empirical formula bend allowance 0078 x mt 017453 x br x a mt material thicknessbr bend radius to inside of material a angle from flat. Most sheet metal materials will conform to the calculations. Sb setback k k factor k is 1 for 90 bends r inside radius of the bend t material thickness.

Understanding the outside setback of the workpiece is an important part of designing sheet metal parts. Outside setback ossb ossb tangent degree of bend angle 2 inside bend radius material thickness the outside setback is a dimensional value that begins at the tangent of the radius and the flat of the leg measuring to the apex of the bend see figure 2. Bend line shift bls the distance from the outside mold line to the original bend line on the flat pattern this is used to calculate the backstop location when working off of a flat pattern. Click image to enlarge using a formula to calculate the setback.

Different results will occur if coining or bottom bending the material. Sheet metal calculator bend allowance equations and calculator. Ultimate tensile strength psi. Calculate the value of bend deduction from the values of bend allowance and outside setback.

When the sheet metal is bent the inside radius pulls the edge of the material away from the apex of the bend. The inside setback is closely related to but should not be confused with the outside setback. This page also includes a link to a on line sheet metal bend allowance calculator.