Figure 1 upspring or upsweep tools are used to form two bends that are too close together for conventional forming methods.
Calculating a rolling offset in sheet metal.
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.
Figure 2 subtracting the material thickness from the outside dimension gives you the required offset depth a.
A is the bending angle in the above equation so.
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.
The first number you need to find when calculating a rolling offset is the true offset which is found using pythagoras theorem.
And by having t and the sheet thickness t we can calculate the k factor as follow.
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.
You need to calculate the circumference of the mean diameter of the ring you are rolling.
Figure 3 whether you are using an upspring offset tool left or a.
Sheet metal cone calculator.
Step 1 calculating the true offset.
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.
The horizontal tool is designed to offset the material by one material thickness.
This simply means that the offset squared plus the rise squared will equal the true offset squared.
The length of the material will then be 11 75 x pi or 36 9137 inches.
To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.
In the diagram above the relationship between the travel length and the offsets is as follows.
This video goes through the basic steps to calculate a 45 degree rolling offset in a piping system.
It uses two triangles to calculate the travel in the pipe.
