A double-face polishing device and a method capable of controlling rigidity of a polishing pad through a cluster dynamic magnetic field are provided. A whole process from double-face rough polishing to precision polishing of a workpiece is implemented by adjusting a rigidity of a flexible polishing pad. The double-face polishing device capable of controlling rigidity of a polishing pad through a cluster dynamic magnetic field includes a variable-rigidity cluster magnetically-controlled polishing pad generating mechanism, a workpiece fast clamping mechanism and a workpiece movement driving mechanism. The variable-rigidity cluster magnetically-controlled polishing pad generating mechanism includes a first magnetic field generating block and a second magnetic field generating block that are symmetrically arranged, wherein the first magnetic field generating block and the second magnetic field generating block each include a shell, a deflection spindle, an eccentric camshaft, a magnet mounting base, a permanent magnet and a motor, the workpiece fast clamping mechanism includes a working tank, a clamping plate, a connection rod, a hinge plate, a fixing hinge, a square magnet, an electrical soft iron block, an annular cast iron and a strip-shaped permanent magnet, and the workpiece movement driving mechanism includes a support block, a cross beam, a horizontal linear motor, a vertical beam and a vertical linear motor.

The phase alignment device to be used with a phase alignment tool may include a body section; and a driving head section connected to the body section. The body section and the driving head section may include an aperture which extends through the body section and the driving head section.

The phase alignment device to be used with a phase alignment tool may include a body section; and a driving head section connected to the body section. The body section and the driving head section may include an aperture which extends through the body section and the driving head section.

The phase alignment device to be used with a phase alignment tool may include a body section; and a driving head section connected to the body section. The body section and the driving head section may include an aperture which extends through the body section and the driving head section.

The phase alignment device to be used with a phase alignment tool may include a body section; and a driving head section connected to the body section. The body section and the driving head section may include an aperture which extends through the body section and the driving head section.

A system of polishing a concave surface of an external piece for a timepiece, including a securing device including a support that carries the piece, and a grinding device including an abrasive mechanism rotatably mounted along a first axis and configured to polish the piece along a first curvature. The securing device further includes a moving mechanism of the support so that the support imparts a back-and-forth motion along a second axis and a contact surface of the abrasive mechanism is curved to polish the piece along a second curvature in addition to the first curvature. The system can be applied to the field of crystals for a timepiece.

A system of polishing a concave surface of an external piece for a timepiece, including a securing device including a support that carries the piece, and a grinding device including an abrasive mechanism rotatably mounted along a first axis and configured to polish the piece along a first curvature. The securing device further includes a moving mechanism of the support so that the support imparts a back-and-forth motion along a second axis and a contact surface of the abrasive mechanism is curved to polish the piece along a second curvature in addition to the first curvature. The system can be applied to the field of crystals for a timepiece.

A linear drive and its use for machining an optical workpiece are proposed, the linear drive having a linear movable rotor, a linearly movable compensating body and an electrical compensating drive for movement of the compensating body opposite to the rotor and the rotor extending into the compensating drive and/or a first bearing arrangement mounting the rotor in a torsionally stiff manner and a second bearing arrangement pivotally mounting the rotor.

A linear drive and its use for machining an optical workpiece are proposed, the linear drive having a linear movable rotor, a linearly movable compensating body and an electrical compensating drive for movement of the compensating body opposite to the rotor and the rotor extending into the compensating drive and/or a first bearing arrangement mounting the rotor in a torsionally stiff manner and a second bearing arrangement pivotally mounting the rotor.

The invention relates to a sample carrier for a sample (70). Said sample carrier comprises a supporting base (10), a carriage (20) having a receiving region (30) for the sample (70), the carriage (20) being supported on the supporting base (10), a guide (40), the carriage (20) being movably arranged along the guide (40), and a disc (60) that is rotationally movable about an axis of rotation (50), said disc being operatively connected to the carriage (20), wherein a center (65) of the disc (60) is located outside of the axis of rotation (50).