Apparatus for forming a groove

A device for forming a groove comprising:

• a pair of hold down inserts located in each of diametrically opposed positions in the frame;
• a permanent magnet having a central axis and North and South magnetic pole portions parallel thereto positioned in the frame with said axis and pole portions perpendicular to the cylinder head contacting portion of the frame and in axial alignment with each pair of hold down inserts;
• means for rotating each cylindrical permanent magnet about said central axis for selective positioning of the parallel North and South magnetic pole portions relative to the hold down inserts so that when the North and South magnetic pole portions are each in contact with both inserts, the magnetic field is shorted across the inserts and creates a minimum magnetic effect with the cylinder head and when the permanent magnet is rotated about its central axis so that each pole portion is aligned with only a single one of the pair of inserts, a maximum magnetic field is effected through the cylinder head;
• a frame formed so as to be firmly seated on a cylinder head;
• means for accurately positioning the frame relative to the cylinder head for either a six or eight cylinder engine;
• two permanent magnet end pole means for releasably fixing the frame to the cylinder head;
• means for supporting a cutting tool for rotation relative to a cylinder head contacting portion of the frame;
• means for altering the relative position of the cutting tool and the supporting means therefor for controlling the groove-forming position of the cutting tool relative to the cylinder head;
• and
• means for adjusting the axial position of the cutting tool supporting means for altering the depth of the cutting tool relative to the cylinder head.

A device for cutting a groove in a cylinder head comprising:

• a cylindrical frame having a flat workpiece contacting surface mountable on an inverted cylinder head;
• a cross member integral with said frame and arranged traversely across said frame;
• a pair of permanent magnets each having both North and South pole portions at one end thereof which are parallel to a central axis of rotation, each permanent magnet mounted in an aperture in and traversely of the respective ends of the cross member so that the axis and both pole portions are perpendicular to said flat workpiece contacting surface;
• said frame having structure for releasably holding the frame to the cylinder head in conjunction with said North and South pole portions of the pair of permanent magnets comprising a pair of metal inserts in parallel relationship to each other and mounted in the frame directly adjacent the pole end portion of each of the respective permanent magnets and in abutting contact therewith;
• means for rotating individually each of said permanent magnets about said central axis through an arc of 90.degree. so that the pole portions thereof will, when opposite magnetic pole portions are each in contact with both inserts, effect flow of the magnetic field across said inserts, thereby creating minimum magnetic field with the cylinder head, and when the permanent magnet is rotated about its central axis so that each pole portion respectively is aligned with only a single one of said pair of inserts, a maximum magnetic field is effected through the cylinder head for fixedly holding said frame to the cylinder head;
• and
• means rotatably supported from the center of said cross member for cutting a groove in the cylinder head concentric to the cylinder of the engine block for which said head portion will cover when the head is mounted on the engine block.