Modular boring head with fine adjustment click mechanism

A modular boring head, comprising:

• a tubular main body having an internal thread with a first pitch and a pair of axially extending cantilevered members;
• a movable rod engaging the tubular main body such that the movable rod moves in an axial direction, D, with respect to the tubular main body, the movable rod having an internal thread with a second pitch different than the first pitch;
• a leadscrew disposed within the tubular main body and having a first external thread, a second external thread and a plurality of gear teeth, the first external thread cooperatively engaging the internal thread of the tubular main body, the second external thread cooperatively engaging the internal thread of the movable rod;
• and
• an anti-rotation feature for preventing rotation of the movable rod,
• wherein the anti-rotation feature comprises at least one cylindrical pin disposed within the movable rod by an interference fit and disposed within an elongated slot formed in the tubular main body,
• wherein the at least one cylindrical pin contacts a spring contained within a housing in the tubular main body that provides a biasing force in the axial direction to eliminate clearance between the internal thread of the tubular main body and the internal thread of the movable rod and the first and second external threads of the leadscrew,
• wherein rotation of the leadscrew causes the pair of axially extending cantilevered members of the tubular main body to cooperatively engage with the plurality of gear teeth of the leadscrew in such a manner so as to produce an audible and tactile click, each click being indicative of a distance the movable rod is displaced with respect to the tubular main body.