Calculating A Rolling Offset In Sheet Metal

This is used to calculate the back stop location when working off of a flat pattern.

Calculating a rolling offset in sheet metal.

Sheet metal calculator bend allowance equations and calculator. Ultimate tensile strength psi. This simply means that the offset squared plus the rise squared will equal the true offset squared. 0 059 0 097 in.

Windseaker1 sorry for being late getting back yes the bend formula works for rolling as well when you roll a plate you are bending it on a large radius the metal still has to shrink on the inside of the neutral line and stretch on the outside to get a finished diameter that you want you have to compensate by adding or subtracting part of the metal thickness from the neutral line. The length of the material will then be 11 75 x pi or 36 9137 inches. Air bend force chart a chart used to calculate the tonnage required for a bend based on thickness tooling and length. X squareroot square of v square of h travel t x cos 90 fitting angle run r squareroot square of travel t square of x.

If you are rolling a ring with a 12 inch od out of 25 inch thick material the mean diameter of the ring will be 11 75 inches. You need to calculate the circumference of the mean diameter of the ring you are rolling. In the diagram above the relationship between the travel length and the offsets is as follows. Air bending one of the three types of bending for sheet metal where the outside mold line is not pressed against the die.

Say you need to form an offset specified as 0 156 inch in 0 059 in thick material. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. Die edge radius in. Here you would subtract the material thickness from the specified offset.

Calculate the square root of the number to find the rolling offset. Most sheet metal materials will conform to the calculations. The resulting number is the offset depth as measured from the material surface. In the example the square root of 208 14 42 inches.

This page also includes a link to a on line sheet metal bend allowance calculator. Step 2 finding the setback and diagonal.