Sketched Bend
You can add bend lines to the sheet metal part while the part is in
its folded state with a sketched bend feature. This allows you to dimension
the bend line to other folded-up geometry.
Some items to note about a sketched bend feature:
A Sketched Bend
feature is commonly used with a Tab feature to bend the tab.
To create a Sketched Bend feature:
Sketch a line on a planar face of the sheet metal
part. Alternatively, you can select the Sketched Bend feature before you
create a sketch (but after you select a plane). When you select the Sketched
Bend feature, a sketch opens on the plane. Click Sketched
Bend  on the Sheet Metal toolbar, or click Insert, Sheet
Metal, Sketched Bend. In the graphics area, select a face that does
not move as a result of the bend for Fixed
Face  .
Click a
Bend
position of Bend Centerline
 , Material Inside
 , Material Outside
 , or Bend
Outside  . |
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Set a value for Bend
Angle, and click Reverse Direction
 if necessary. Select Override
value to override the preset Bend
Angle. Override value is
available if a sheet metal gauge table has been selected for the part. To use something other than the default bend radius,
clear Use default radius and Use gauge table (if a sheet metal gauge
table has been selected for the part), and set Bend
Radius  . To use something other than the default bend
allowance, select Custom Bend
Allowance, and set a bend allowance type and value. Click OK
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