An Elbow Inside Branch Joint is the intersection of a pipe attached to the interior of an elbow and is coplainar with that curved elbow. Axial and lateral offsets are measured from the center of one of the openings at the end of the elbow.
Joint Name: name of this joint which is unique to this project or currently opened joints
Pipe OD: (Outside Diameter) must be a positive number
Pipe Wall: (Wall Thickness) must be a positive number, less than half Pipe OD
Elbow OD: must be a positive number
Elbow Radius: must be a positive number at least half of the Pipe OD
Axial Offset: any negative value where the pipe remains in contact with the elbow. If a negative axial offset is specified that is past the opposite end of the 90 degree elbow, a 180 degree elbow is assumed and drawn.
Lateral Offset: any positive or negative value where the pipe remains in contact with the elbow.
Because it would be very difficult to wrap a template around the elbow to cut a hole in it, only a surface joint is supported. If you want to cut a hole in the elbow: first cut the end of the pipe using a template, then hold the end of the pipe up against the elbow and draw around the interior or exterior of the pipe to create the cut line you want.