Abstract: A machine for refinishing the surface of a bowling to improve the roundness of the bowling ball with the machine including individual bowling ball resurfacing units each having a cone-shaped cup resiliently supported on the bowling ball resurfacing unit with the cone-shaped abrading cups having an annular abrading region located on the periphery of cone-shaped abrading cup so that when the cone-shaped abrading cups are rotated the abrading region engages a surface on the bowling ball to simultaneously rotate and abrade the surface of the bowling ball to bring the bowling ball into round.

Abstract: An apparatus for modifying the attitude of a golf ball having burrs formed thereon, the apparatus having a second station in which a CCD camera takes image data of the golf ball while rotating, one time, the golf ball around the X-axis by a step motor, and the rotational angle around the X-axis and that around the Z-axis, with which the equator having burrs formed thereon are required to be horizontal, are calculated in accordance with the image data; fourth and fifth stations in which step motors rotate the golf ball around the X-axis and Z-axis by the foregoing angles to-modify the attitude of the golf ball; and a sixth station in which a CCD camera takes image data of the golf ball to finely modify the attitude of the golf ball by step motors.

Abstract: A spherical member polishing apparatus has a fixed disk which is disposed in opposition to a rotating disk with a predetermined clearance. The rotating disk is rotated, and spherical members are clamped and pressurized between the rotating disk and the fixed disk for roll-polishing the spherical members. A plurality of grooves are formed along a circumferential direction of the fixed disk, and a plurality of working-fluid supply ports are randomly formed along the circumferential direction between the grooves, between the groove and an outer peripheral portion of the fixed disk, and between the groove and an inner peripheral portion of the fixed disk. The working fluid is supplied through the working-fluid supply ports to the fixed disk. A large number of spherical members are polished at a high precision, while a variation in polishing precision and the like are avoided as much as possible.

Abstract: A substantially improved table soccer/fussball game playing ball is fabricated by molding an oversized spherical blank entirely from a single thermoplastic material, preferably a urethane material having a hardness without the approximate range of from about 50 Shore D to about 60 Shore D. The oversized molded blank is then subjected to a precision surface machining process, preferably using a centerless grinding machine, to reduce its diameter to a desired finished magnitude and to provide the resulting finished playing ball with a very precisely spherical shape having a sphericity which does not vary by more than about 0.001 inch on any external surface portion thereof.

Abstract: A tool assembly for finishing a spherical surface of a bowling ball includes a tool having a pliable solid right cylindrical body with concave-shaped depressions formed in opposite faces of the body and a pair of abrasive disks disposed in the depressions. The body is shorter in axial length than in diameter, with the opposite faces thereof being spaced apart by the axial length, and generally parallel to each other. The depressions are centered on the opposite faces and oriented back-to-back. One concave depression has a larger chordal length than the other but both concave depressions have spherical radii similar to that of a bowling ball. The abrasive disks are releasably attached, with hook and loop material, in the concave depressions so as to lie substantially flush against the surfaces of the depressions.