Abstract: A drill grinder includes a feed means in which a sleeve, a first cam, a second cam, and a second casing are engaged in sequence, the sleeve having a disk which has two diametrically opposite formed plane portions and two first wheels rotatably engaged thereto for rolling on the first cam which is equipped with two second wheels for rolling on the second cam and the first cam can only longitudinally be moved in the first casing, the second cam having a ratchet wheel disposed thereto, both of the second cam and the ratchet wheel are mounted to a tubular portion of the second casing in which a ring-type gear engaged for a belt connected, the first casing pivotally engaged to a base by a certain angle corresponding to an axis of the first casing, a start means having a fork to actuate the ratchet wheel and an inspecting means having a probe to contact the disk and a grinding wheel means having a grinding wheel which has a longitudinal axis intersecting the axis of the first casing at an angle, such that the sleev

Abstract: A device at centreless grinding machine incorporating a frame (1), a regulating wheel carriage (7) individually displaceably supported on guides (2) in the frame and supporting a regulating wheel (9), a grinding wheel carriage (3) individually displaceably supported on guides (2) in the frame and supporting a grinding wheel (4), said regulating and grinding wheels (9, 4) between them defining a grinding gap (10) of adjustable size, a work support (11) provided in the grinding gap, and dressing means for the regulating and grinding wheels, said grinding and regulating wheel carriages (3, 7) each being designed with at least two spaced apart supporting points (5a, 6a; 13a, 14a) relative to the guides, wherein said carriages are arranged in an overlapping relation thus that one supporting point (6a; 14a) for one of the said carriages (3; 7) is situated between the two supporting points (13a, 14a; 5a, 6a) for the other carriage (7; 3), for the purpose of compensating thermally dependent length variations at said

Abstract: A floating rotary drive device sequentially holding a workpiece of a series of workpieces to be supported with slack while each workpiece is machined by grinding while the workpiece is rotated about a slack axis of rotation, comprising a motor having n output shaft, a chuck (2) rotatable about an axis of rotation which chuck is attached to the output shaft of the motor (9), by a flexible control (30) and positioning means for positioning the machined workpiece after it has been ground, characterized in that the device comprises: coupling means (14, 39; 15, 40) for automatic coupling of the workpiece to be ground with the chuck; the coupling means being actuatable at the end of a machining operation to bear against the chuck to center the chuck with its axis of rotation coincident with the specific axis of rotation of the machined workpiece in a final position and to immobilize the chuck in the final position during the removal of the machined workpiece and during the fitting of a sequential workpiece to be ma

Abstract: A grinding wheel for treating a surface of a power transmission belt/belt sleeve. The grinding wheel has a cylindrical body defining a rotational axis and having a circumferential outer surface with there being a plurality of abrading elements arranged in circumferentially spaced relationship on the outer surface of the body. Reliefs are provided between adjacent abrading elements. The invention further contemplates a method of treating a belt using the inventive grinding wheel.

Abstract: A dynamic steady rest particularly adapted for use in supporting a rotating workpiece during a grinding operation. The steady rest includes a lever assembly pivotally mounted on a base and having a workpiece support arm and a counterweight arm. Weights are adjustably secured to the counterweight arm and bias the support arm upwardly and into supporting engagement with the rotating workpiece. The steady rest further includes two dashpots pivotally secured between the base and the support arm to dampen the motion of the support arm.

Abstract: The present invention relates to an apparatus for polishing semiconductor wafers and, in particular, one in which the polishing pads are linear, that is, the polishing pads have a long linear dimension relative to their width and have a uniform cross-section along this linear dimension. In addition, the wafer holder travels in a straight line parallel to the long linear dimension of the polishing pads.

Abstract: A notch of a wafer is chamfered by a method which is characterized by disposing a rotary disklike grindstone and a wafer to be ground with the disklike grindstone in such a manner that the surfaces thereof intersect each other, relatively moving the grindstone and the wafer toward or away from each other, and meanwhile rotating the wafer within a prescribed angle around the central axis perpendicular to the surface of the wafer thereby effecting a work of chamfering the notch of the wafer in the circumferential direction and/or in the direction of thickness of the wafer.

Abstract: A poppet valve cleaner 10 includes a frame 20, a poppet valve brush assembly and a carriage assembly. The poppet valve brush assembly includes a drive motor 32 and a pair of cup shaped steel wire brushes 44 and 46 driven by the motor. The carriage assembly includes a carriage support shaft 54 and a carriage plate 64 that is pivotally and slidably attached to the carriage support shaft. A chuck assembly 86 is mounted on the carriage plate 64. A drive roller 138 is mounted in the side walls 88 and 90 of the chuck assembly and is rotated by an electric motor 144. A valve stem 14 is positioned between idler rollers 96 and 98 and compression roller 108 that is biased toward the idler rollers by a compression spring 134. The idler rollers 96 and 98 are driven by drive roller 138 to rotate the poppet valve. The carriage plate 64 is manually movable to position the valve head 16 between the steel wire brushes 44 and 46 and to move surfaces of the valve into contact with the brushes to remove carbon from the valve.