In other words, each chart creator must have said something like, "This is the value of a 1/32-in. This leads to the question, Which chart is correct? The answer is, All of them! They all are correct for the environment in which they were created. For example, a part with three bends could have as much error as 0.117 in. ![]() Top and bottom values can make a good part a bad one quickly. However, if tight tolerancing or if multiple bends are involved, the difference between the Assuming that you have a generous tolerance over one bend, the error in bend deduction can be spread out, and a good part still can be produced. The total error, or amount of difference between the top and the bottom entries, was 0.039 in. ![]() Figure 1 shows data from five of those charts selected at random. In reviewing a couple dozen bend deduction charts from a variety of sources, I couldn't find any that agreed with another, with the exception of a single number here and there.
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