Calculating A Rolling Offset In Sheet Metal

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Calculate the square root of the number to find the rolling offset.

Calculating a rolling offset in sheet metal.

This page also includes a link to a on line sheet metal bend allowance calculator. You need to calculate the circumference of the mean diameter of the ring you are rolling. Step 2 finding the setback and diagonal. Sheet metal calculator bend allowance equations and calculator.

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. In the example the square root of 208 14 42 inches. The length of the material will then be 11 75 x pi or 36 9137 inches. Ultimate tensile strength psi.

0 059 0 097 in. Punch edge radius in. The resulting number is the offset depth as measured from the material surface. 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 following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The first number you need to find when calculating a rolling offset is the true offset which is found using pythagoras theorem. Die edge radius 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.

This simply means that the offset squared plus the rise squared will equal the true offset squared. Say you need to form an offset specified as 0 156 inch in 0 059 in thick material. You then need to take the square root of the result to get the true offset. In the diagram above the relationship between the travel length and the offsets is as follows.

Air bend force chart a chart used to calculate the tonnage required for a bend based on thickness tooling and length. Here you would subtract the material thickness from the specified offset.

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