Sheetmetal butt joints and overall dimensioning

I'm new to SWorks. I design sheetmetal parts and come from AD Inventor.
Here's my problem. First, when I create a standard rectangle part with
four flanges ( basically a four sided box all 90 degree bends ) I
sketch the part as a rectangle with the overall finished dimensions.
When I add the flanges and set material inside ( to maintain the
overall dimension of the part ) then trim side bends the corner
automatically overlaps and I cannot easily turn the corner into a butt
joint. The Closed Corner command only adds material it doesn't take
away. The only solution I came up with is to cut away the material to
make it a butt joint or to start the initial part sketch dimensioning
minus the material thickness and minus the bend radius for each side.
This seems like alot of extra work.

What am I missing?

 

Assuming your pan is symmetrical, I would start by sketching a single
corner and using the base flange feature as a starting point by
extruding to half the depth-1 material thickness-IBR. Add a flange, but
use the outside option and then use the closed corner feature. Add any
other symmetrical features and then mirror the bodies to create the
pan.

This method works pretty well, reduces features, reduces any work on
corner detail by 1/4 and provides two centerline planes which can be
used for mating.

Hope this helps.

 

Maybe I'm missing what you're trying to do, but maybe you could try
starting your part as a solid instead of a sheetmetal, then shell, then
rip the corners (you can pick one direction to rip, instead of allowing
the default two directions) to get your butt joint, and then pick the
bottom of your box and select Insert Bends to generate your sheetmetal
functions of Flatten & Process Bends....

....just a thought.

Steve R.