Hem
The Hem tool adds a hem to your sheet metal part at a selected edge.
Here are some additional items to note about the Hem tool:
To create a hem feature:
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In an open sheet metal part, click Hem  on the Sheet Metal toolbar, or click Insert, Sheet Metal, Hem.
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In the graphics area, select the edges where you want to add a hem.
The selected edges appear in Edges  .
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In the PropertyManager, under Edges:
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Click Edit Hem Width to edit the sketch of the profile.
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Select Material Inside  or Bend Outside 
to specify where to add the material.
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Click Reverse Direction  to create the hem on the opposite side of the part.
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Under Type and Size:
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Click a hem type:
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Closed 
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Open 
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Tear Drop 
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Rolled 
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Set:
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Length  (closed and open hems only)
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Gap Distance  (open hem only)
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Angle  (tear drop and rolled hems only)
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Radius  (tear drop and rolled hems only)
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Under Miter Gap, set Miter Gap  if you have intersecting hems. Mitered corners are automatically added to intersecting hems, and you can set the gap between these hems.
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To use something other than the default bend allowance, select Custom Bend Allowance, and set a bend allowance type and value.
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To add relief cuts, select Custom Relief Type, then select the type of relief cut:
If Custom Relief Type is:
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Rectangular or Obround and you select Use Relief Ratio, set a value for Ratio.
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Rectangular or Obround and you clear Use relief ratio, set values for Relief Width  and Relief Depth  .
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Tear select Rip  or Extend  .
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Click OK  .
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