Deflectable boring quill

Claim 1

A boring quill adapted to be mounted on the spindle of a boring machine to provide retraction of the cutting tool mounted thereon and compensation adjustment for cutting tool wear, said quill comprising: a. a cylindrical housing having an axial chamber provided therein, b. a circular sheet-form resilient diaphragm mounted in said chamber and affixed at its periphery to said housing, c. an adapter for supporting a tool holder, said adapter being mounted at a central portion of the outer surface of said diaphragm, d. a retainer having a radial wall and an axial wall mounted with said radial wall engaging a central portion of the inner surface of said diaphragm, said adapter and said retainer being affixed to each other and clamping said diaphragm therebetween, said diaphragm pivotally supporting said adapter and said retainer and biasing same to a central rest position, e. a cylindrical cam chamber provided in said housing f. a barrel-type cam mounted within said cam chamber arranged to move both axially and rotatably therein, the surface of said cam having both an axial rise and a radial rise, g. cam follower means mounted in a radial channel provided in said housing having one end engaging said cam and the other end engaging the inner surface of the axial wall of said retainer, and h. means for moving said cam both axially and radially comprising an operating bar having one end affixed to said cam and the other end externally positioned, whereby moving said operating bar axially causes a cutting tool mounted in said adapter to retract and extend, and rotating said operating bar changes the extended position of said cutting tool to compensate for wear thereof.