Tuesday, March 9, 2010

Does anybody know what a 40-90掳 annotation means on sheet metal folding?

I have a sheet metal drawing trying to model with autodesk inventor and at the folding line it is showing an annotation of 40-90掳 with a leader line pointing to the fold line. I understand the 90掳 means the folding angle, but what does the 40 mean?Does anybody know what a 40-90掳 annotation means on sheet metal folding?
I'm just guessing since you haven't posted an image of the drawing, but it could be the bend angle should fall within the range of 40 degrees to 90 degrees or that it is a 90 degree bend with a 40-mm radius. Just a WAG.

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