Abstract: A honing device which employs a plurality of radially-displaceable tools mounted circumferentially around a rotary body. The tools are constructed as a laminate formed by the axially elongated abrasive strip bonded to and overlying a wood backing strip. The abrasive strip has a width, as measured in the direction of rotation, which is normally less than the width of the backing strip. The abrasive and backing strips are radially urged for simultaneous contact with the cylinder wall being honed.

Abstract: A valve-seat cutting machine having a vertically movable support structure with a vertically elongated spindle assembly mounted thereon. The spindle assembly includes an elongated pilot adapted to be axially inserted into a bore formed in an engine block. A cutting tool is rotatably positioned in surrounding relationship to the pilot rod and is driven from a substantially coaxially aligned driving sleeve, which sleeve is connected to the tool by an intermediate coupling which permits substantially universal movement so that the tool can undergo angular and/or lateral misalignment relative to the rotational axis of the driving sleeve. The pilot rod, which moves angularly or laterally with the cutting tool, is also connected by a similar joint structure to an actuator which permits the pilot rod to be slidably moved relative to the cutting tool. A compression transmitting structure extends through the latter-mentioned joint structure to permit a pushing force to be imposed on the pilot rod.

Abstract: A grinding machine particularly for grinding the teeth on a carbide cutter. The machine includes a carriage swingably mounted on a frame for oscillation about a pivot axis. The carriage has a grinding wheel mounted thereon and rotatably driven by a motor which is also mounted on the carriage. The wheel is rotatable about an axis which is approximately parallel to but spaced from the pivot axis. A feeding mechanism projects outwardly from the front face of the grinding wheel at an angle of approximately 45.degree. relative to the rotational axis. The feeding mechanism releasably supports a carbide element. The feeding mechanism is linearly advanced toward the grinding wheel in an intermittent steplike movement which is synchronized with the oscillating movement of the carriage so that the grinding wheel cuts a groove across the carbide element during both the forward and return swings of the carriage.