Apparatus for forming a groove

Abstract

A support frame having a face which may be positioned against a workpiece. A cutting arm is mounted for rotation relative to the axis of the frame in such a manner as to support a cutting tool which may be used to form a groove in a workpiece, such as a cylinder head. The cutting arm is supported in a rotating unit such that the depth of the tool and the radius of the groove may be precisely controlled. A crank is attached to the turning unit for positive rotation of the cutting tool. A plurality of locating, headed pins are mounted in the frame so that the heads are biased to positions beyond the workpiece-contact face of the frame. In the exemplary use of the tool to form a groove in a cylinder head, the pins may be precisely positioned so as to cooperate with stud bolt holes in the cylinder head in order to precisely locate the axis of the turning unit relative to the cylinder head. The heads of the pins extend into the bolt holes and contact the walls thereof to prohibit movement of the frame about its axis. A pair of rotatable magnets are positioned on the frame in diametric opposition to one another. Each magnet is axially aligned with a pair of hold down inserts so that the elongated poles of the magnets may be aligned relative to the inserts in order to impose a maximum magnetic field between the magnets and the workpiece when the cutting tool is being rotated about the frame axis.