Calculating A Rolling Offset In Sheet Metal

Sheet metal cone calculator.

Calculating a rolling offset in sheet metal.

The horizontal tool is designed to offset the material by one material thickness. This video goes through the basic steps to calculate a 45 degree rolling offset in a piping system. The length of the material will then be 11 75 x pi or 36 9137 inches. View the cone instructions below to learn how to manually layout the flat pattern for a truncated cone in single or multiple gore sections.

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. This simply means that the offset squared plus the rise squared will equal the true offset squared. A is the bending angle in the above equation so. Figure 2 subtracting the material thickness from the outside dimension gives you the required offset depth a.

This video goes through naming the parts of a piping offset as well as going through a couple examples on how to calculate the offset and the travel in a 45. It allows you to determine either the size of raw material needed or the number of gore sections to fit on your available material. The first number you need to find when calculating a rolling offset is the true offset which is found using pythagoras theorem. In the diagram above the relationship between the travel length and the offsets is as follows.

And by having t and the sheet thickness t we can calculate the k factor as follow. Step 1 calculating the true offset. You need to calculate the circumference of the mean diameter of the ring you are rolling. This is used to calculate the back stop location when working off of a flat pattern.

To calculate r which is the radius of the arc on the neutral axis we can use the following equation. 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. To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r. Air bend force chart a chart used to calculate the tonnage required for a bend based on thickness tooling and length.

Air bending one of the three types of bending for sheet metal where the outside mold line is not pressed against the die.