Back spotfacing and counterboring tool

摘要: A spotfacing cutter is pivotal into and out of a recess in tool shank by hinge pin which journaled the shank. An activating ring, mounted for limited rotation on shank, connected with pin. annular friction pad interposed between ring pilot sleeve surrounds braking surface formed or to be urged engagement bore workpiece brake relative so that will moved cutting position retracted therefrom merely simultaneously reversing ring. The can passed through while it retracted; then reversed extend as back spotface bore. Then spindle again, withdrawn