A clamping device for an engine parts grinder, and its three-point clamping structure and pivoting control structure. With the three-point clamping structure and the pivoting control structure, the clamping device is capable of clamping the workpiece in a three point clamping manner with a stable clamping force. The pivoting control structure moves in pivoting motion to control the operating member to make the clamping member move downward or upward to clamp or to release the workpiece, and therefore the operation is very simple. Meanwhile, the operating member and the pressing unit provide a one-way self-locking function, and the elastic abutting unit presses against the cam portion of the pressing unit to create a position restricting effect. In addition to providing a stable clamping force, the operating member can be automatically locked when pivoted to a positioning position, which makes the clamping device very convenient to use.

A workpiece centering gauge for a grinding machine includes a link having a first pivot configured to couple with the grinding machine; a first encoder that measures an angle of the link at the first pivot; a second pivot included with the link; a measuring fork configured to releasably contact an outer surface of an elongated workpiece; a surface feeler, having a transducer, included with the measuring fork that measures a workpiece diameter a second encoder that measures an angular position of the link relative to the measuring fork; the angular position measured by the first encoder, the angular position measured by the second encoder, and a measured workpiece diameter are used to determine a deviation of the elongated workpiece from a centerline.

Provided is a chuck structure, which is configured to chuck an annular workpiece from a radially outer side of the workpiece. The chuck structure includes: leaf spring members arranged at a predetermined pitch along a circumferential direction of the chuck structure so as to be symmetrical with respect to a mechanism center axis; chuck claw members mounted to distal ends of the leaf spring members, respectively; and a pressing force applying mechanism configured to apply a force of pressing the leaf spring members radially inward, to thereby elastically press the chuck claw members onto a radially outer surface of the workpiece.

Provided are a device and method for polishing a substrate, in which an upper ground surface, a side surface and a lower ground surface of a substrate can be simultaneously polished, and a polishing wheel can be evenly used on the whole so as to be uniformly abraded. A substrate polishing system is to polish a substrate, of which upper edge and a lower edge are polished, and includes: a table, on which the substrate is secured; a spindle provided at the upper portion of a side surface of the table; a polishing wheel formed in the shape of a cylinder and having a rotating shaft mounted perpendicularly to the substrate, so as to polish the substrate with a side surface thereof while rotating by the spindle; and a Z axis movement means for moving the polishing wheel in the vertical direction during the polishing of the substrate.

A mounting system includes a magnet core arranged for positioning inside a magnet coil. The magnet core includes a cylindrical, elongate receiving region with a central axis, a rapid-mounting mandrel arranged for insertion into the cylindrical, elongate receiving region, and a discoid workpiece driver, detachably fastened to the rapid-mounting mandrel and extending normal to the central axis. A one of the magnet core or the rapid-mounting mandrel includes a rapid-mounting device for mounting the rapid-mounting mandrel in the magnet core. Example embodiments may includes the rapid-mounting device integrated into the magnet core or integrated into the rapid-mounting mandrel.

Various examples are provided for polishing techniques for flexible tubular workpieces. In one example, a method includes supporting a tubular workpiece on a rod that extends axially through it; positioning a turning wheel against an external surface of the tubular workpiece, where it is held by magnetic attraction; and rotating the tubular workpiece by rotating the turning wheel. The external surface of the tubular workpiece is polished by the abrasive particles during rotation of the tubular workpiece. In another example, a polishing system includes a workpiece holder including a rod configured to axially support a tubular workpiece; a turning wheel with abrasive particles distributed about an outer surface; a wheel support assembly configured to position the outer surface of the turning wheel against the an external surface of the tubular workpiece, where it is held by magnetic attraction. The external surface is polished during rotation of the tubular workpiece.

A machine tool includes a main shaft unit; a polishing head for processing a workpiece; and an unnecessary byproduct leakage preventing unit for preventing leakage of abrasive resulting from processing at or around a part of the workpiece, the part being processed, and wherein the unnecessary byproduct leakage preventing unit includes a cover provided separately from the polishing head, the cover having a structure that is open in three directions and that has walls in another three directions such that a protection space where to hold a part of the workpiece is defined, the cover for receiving the abrasive, and a movement mechanism for moving the cover so as to stay apart from the workpiece while the workpiece is not being processed and so as to have a part of the workpiece held in the protection space while the workpiece is being processed.

An eyeglasses lens processing system includes the transport robot that holds an eyeglasses lens in a holding portion to transport the eyeglasses lens, an eyeglasses lens processing device that processes the eyeglasses lens held between a pair of the lens holding shafts, a shape information acquisition unit that acquires information about a refractive surface shape of the eyeglasses lens, and a relative movement unit that changes a relative positional relationship between the eyeglasses lens held by the holding portion of the transport robot and the pair of lens holding shafts. The relative movement unit at least two-dimensionally changes the relative positional relationship, based on acquired information of the refractive surface shape, to insert the eyeglasses lens into a predetermined insertion position in a gap between the pair of lens holding shafts.

A machine tool includes a tool holder configured to hold a grindstone. A workpiece holder is configured to hold a workpiece. At least one actuator is configured to move the tool holder in a movement direction relative to the workpiece holder. A motor is different from the at least one actuator and is configured to move one holder out of the tool holder and the workpiece holder along a control axis. Actuator control circuitry is configured to control the at least one actuator to move the tool holder in the movement direction. Motor control circuitry is configured to control the motor to control the one holder to be stationary in a direction along the control axis. Contact detection circuitry is configured to detect a contact between the grindstone and the workpiece based on a change in a control value of the motor.

A chuck for a machine tool having a rotation spindle with a main axis of rotation. The chuck comprises a base plate, a first rotatable plate eccentrically mounted on the base plate, a second rotatable plate eccentrically mounted on the first rotatable plate, balancing means for aligning a principal axis of inertia of the chuck with the main axis of rotation and a holding mechanism. The chuck is provided with an actuating mechanism for angularly displacing the first rotatable plate around a first rotation axis over a first angle of rotation and/or the second rotatable plate around a second rotation axis over a second angle of rotation such that the position of the object with respect to the main axis of rotation can be altered.