Abstract: This invention relates to the addition of lithium bromide to a polymeric material to reduce the viscosity of the polymeric material. This invention finds particular use in the reduction of the viscosity of radiation curable compositions, such as polyacrylates.

Abstract: Radiation cured compositions having improved abrasion resistance and cure response are made from blends of the reaction product of a diisocyanate, a hydroxyalkyl acrylate and a polyether diol with the reaction product of a diisocyanate, a hydroxyalkyl acrylate and a polyether triol wherein the average acrylate functionality of the blends is from about 2.4 to about 2.6. Such cured compositions are useful as coatings for various substrates.

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.