Help sez: "Narrow Corner. Uses the algorithm for large bend radii to narrow the gap in the bend area."
Could someone please interpret this for me? What does this mean to someone who is just modeling a sheet metal part? Why would I use this option? Is the word "narrow" in the name of the option a verb or an adjective? Is this only useful for large radii? How do you define a large radii?
Narrow corners makes your corner notches rounded and curved inward to create a tighter bending relief. Otherwise it's a v-shape notch up to the tangent of the bend. Turn off "Simplify Bends" in the Flat Pattern feature to see the effect, otherwise you don't notice much of a difference. I only saw much of a difference for gages needing a 1/8" or larger radius. Generally for anything that gets welded, our guys like as tight a corner as possible to minimize blowing through the corner.
Edit: I just noticed that your gap of the Closed Corner feature must be smaller than the initial gap defined by your edge flange or other feature, otherwise it doesn't narrow the relief.
Matt,
I currently work at Rapid Sheet metal and see close to 80 different models a day. Standard us classic sheet metal tools are
.030 in
.060
.090
.12
.187
.250
.375
unless you need something different use a .030 inside radii on all metal unless it's alum and thicker then .090.
This will save you some bucks