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Rolled Piece with Arc Dimension, different then Flat Piece Dimension

Question asked by Peter Kennedy on May 2, 2016
Latest reply on May 4, 2016 by Mark McMullen

I've attached the part and drawing, I want the piece to have an arc length of 37-1/2" which when the piece is rolled that what the outside length is, which is correct. However when I use the flat pattern in the drawing it says the length of material is 37-5/16" doesn't make sense to me. Maybe it's correct I'm not sure.

 

I've also changed so I dimension the inside arc with the arc length and flip the way the sheet metal extrudes and it changes the arc length to 37-15/16" when rolled and 3-11/16" when flat. 

 

Does this seem correct?

 

Thanks.

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