# solidworks Understanding K-Factor Bending calculations using K-Factor CSWP Sheet Metal

solidworks Understanding K-Factor Bending calculations using K-Factor CSWP Sheet Metal.SOLIDWORKS sheet metal tools are relatively straight forward, but may not be clearly understood. In sheet metal, there is a powerful bend constant known as the K-Factor. It ultimately allows you to estimate the amount of stretch without knowing what type of material you are bending. In practical terms, it’s just a generic bend allowance to use when you don’t know the process or machine that is going to be used to bend the sheet. I’d like to review K-Factor and how K-Factor applies to your sheet metal designs. Here is a book definition of K-factor:

K-Factor– A constant determined by dividing the thickness of the sheet by the location of the neutral axis, which is the part of sheet metal that does not change length. So if the thickness of the sheet was a distance of T = 1 mm and the location of the neutral axis was a distance of t = 0.5 mm measured from the inside bend, then you would have a K-Factor of t/T = 0.5/1 = 0.5.

Now let’s take a look at an example of K-Factor. Let’s presume you are creating a sheet metal part in SOLIDWORKS. Let’s start out with a sketch of 10 mm by 10 mm. Once you activate the base flange tool, you have an available list of parameters you need to specify to determine how sheet metal is going to stretch.

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