You now have the bend deduction for that material thickness using that die width and that punch radius. Subtract the length you wrote down from the combined formed length. Again use calipers to to measure the legs. You now have 2 legs roughtly 2"+ material thickness apiece. Measure the 4" width with calipers, and write each dimension on the corresponding side. Then you get into deep discussions about the difference between bend allowances and bend deductions.Īfter all is said and done, the best way is to cut a small blank, maybe 4" by 6". The charts there used a different formula and k-factor for computing the bend allowances. We used the same formula for bend allownaces regardless of the material being used. We used strictly coining, but air bending when absolutely required. All we used there was air bending.Īnother company I worked for multiplied the material thickness by 6 to give us the die width. Then we had a chart that told us which bend allowance to use depending on whether it was stainless steel, aluminum, or mild steel. One of the companies that I worked for chose their die by multiplying the material thickness by 8 times. The problem is, it also depends on the tooling and process for your company uses. You can have charts that give you bend allowances for different gauges.
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