Take a U-shaped wire, bent from 10 mm O.D. stainless steel.

You model it as a swept extrusion or a pipe (solid) and when finished,

you calculate the required length to cut from your stock material, either

by doing the geometry math yourself or by creating an evalute feature.

Either way you end up with the same answer, 3 straight lengths and 2 quarter

circles.

If you model the same part but now as a square (10x10 mm) section and then

declare it as

a sheetmetal part you can get the required length by using a flat pattern

feature.

When a sheet metal part is bent, it stretches and therefore, which ProE

recognizes, the total

length required is less than the "geometrical answer" above.

Its obvious that in reality, the wire stretches when bent just like a strip

of sheeet metal and that

therefore the second smaller answer is correct.

Now, does anybody know a way of getting a "flat pattern" answer without

having to redo the part

in square form. This redo can get complicated if there are more bends to the

wire that are not all in the same

plane.

Bertil

- posted
12 years ago