Evaluation

The working angle is within tolerance, following the rule that the working angle of an odd joint in a two-piece joint system is 1/2 degree or less. Note that in each of the good examples the front working angle (FWA) is 1/2 degree or less and is treated as a separate joint. The middle working angle (MWA) and the rear working angle (RWA) are subtracted. The difference (DIFF) is 1/2 degree or less. The middle and the rear joints may cancel each other.