Edge Bent Down Model
Figure 2 shows the edge bent down model. The equation when AD and BC are the same length is:
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For example, assume the width of channel side L is 0.800 inch, and the channel side is formed 17 degrees at the first pass. The elevation of the entrance guide H should be calculated by Equation 1 as the edge bent down model.
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Thus, the elevation of the entrance guide H should be 0.114 in.
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Figure 3 is a table of coefficient (H/L) for the edge bent down model. For example, assume the width of channel side L is 0.800 in. and the channel side is formed 25 degrees at the first pass. From Figure 3, when the forming angle a is 25 degrees, the coefficient (H/L) is 0.201.
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The elevation of the entrance guide H, then, should be set to 0.161 in.
From Figure 3, when the forming angle a at the first pass is 90 degrees, the elevation of the entrance guide should be zero in height.
