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Interference is an option for Involute.
Interference->True specifies that the involute locus will blend into a straight line from the point where the involute meets the base circle to the center of the base circle.

• The default setting is Interference->False.
• If Interference is set to
False, the natural equation of an involute tooth profile goes through a first-order singularity at the point where the tooth profile meets the base circle (when the value of the controlling parameter is zero) and then forms a mirror image of the tooth for negative values of the controlling parameter.
• See also: Constraint.