Axis
BTL Base Feature (Bent
Tangent Line Base Feature): line present on the Wall and
corresponding to the limits of the bend's fillet.
IML (Inner
Mold Line): line created by intersecting the internal surfaces of the
bend (before filleting) and the wall
OML (Outer
Mold Line): line created by intersecting the bend support and a plane
perpendicular to the wall and normal to the OML.
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