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Reliefs
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Another   notch   which   we   will call   a   relief   notch   is   set   back (relieved)    a    certain    dimension from   the   edge.   This   is   to   keep the    material    from    fracturing while   forming   the   metal.   Normally that   dimension   is   called   out   on the    blueprint.    Sometimes    this notch   is   used   for   parts   with   a large   bend   radius.   The   previous notches   can   be   used   with   a   large bend   radius   if   a   relief   hole   or slot   is   used   in   the   corner   (see Bend    Reliefs).    If    no    relief distance   is   called   out   on   the print   and   you   are   using   a   large bend   radius   with   this   type   of notch    then    to    be    safe    use    a minimum   distance   of   the   material + the bend radius. It    is    possible    to    see    a variation   or   combination   of   some or   all   of   these   notches   on   the same part. Below   is   an   illustration   of   a corner    to    corner    with    relief notch    combination    for    a    large bend     radius.     If     depth     or specified   distance   is   not   called out   on   the   print   then   minimum distance     would     be     material thickness   plus   bend   radius.   The two   distances   are   normally   the same     dimension     but     can     be different.  
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Flange - B.D. + Distance = ?
D1 = Flange - B.D. + Specified Dis. D2 = Flange - B.D + Mat. Thk. D3 = Flange - Depth D4 = Depth  - B.D. + Specified Dis.