A rotational control structure of a pneumatic tool includes a housing provided with a cylinder unit. The cylinder unit has a bottom wall with two through holes and a guide post extending outwardly. The guide post has a gas passage and a gas outlet. The guide post is closely connected with a rotatable control ring leaning against the bottom wall. A sealing ring is provided between the bottom wall and the guide post. The control ring has a control passage therein. The control ring is rotatable for the control passage to communicate with one of the through holes of the bottom wall, thereby controlling the forward/reverse rotation of the pneumatic tool.

A rotational control structure of a pneumatic tool includes a housing provided with a cylinder unit. The cylinder unit has a bottom wall with two through holes and a guide post extending outwardly. The guide post has a gas passage and a gas outlet. The guide post is closely connected with a rotatable control ring leaning against the bottom wall. A sealing ring is provided between the bottom wall and the guide post. The control ring has a control passage therein. The control ring is rotatable for the control passage to communicate with one of the through holes of the bottom wall, thereby controlling the forward/reverse rotation of the pneumatic tool.

A grinding wheel tool for microgroove processing and a method for fabricating a microgroove, including a grinding wheel tool body. The grinding wheel tool body is formed by sequentially stacking a plurality of grinding wheel sheets along a thickness direction of each of the plurality of grinding wheel sheet, and the initial diameters of the individual grinding wheel sheets are the same. The outer edge circumference of each grinding wheel sheet is different due to notches, the grinding wheel sheet with a large outer edge circumference wears slowly; the grinding wheel sheet with small outer edge circumference wears fast. For the grinding process of microgrooves of the same depth, the processing end face of the grinding wheel tool body will eventually form a stable contour shape, and the outer edge circumference of each grinding wheel sheet can be adjusted by notches to form different contour shapes.

A grinding wheel tool for microgroove processing and a method for fabricating a microgroove, including a grinding wheel tool body. The grinding wheel tool body is formed by sequentially stacking a plurality of grinding wheel sheets along a thickness direction of each of the plurality of grinding wheel sheet, and the initial diameters of the individual grinding wheel sheets are the same. The outer edge circumference of each grinding wheel sheet is different due to notches, the grinding wheel sheet with a large outer edge circumference wears slowly; the grinding wheel sheet with small outer edge circumference wears fast. For the grinding process of microgrooves of the same depth, the processing end face of the grinding wheel tool body will eventually form a stable contour shape, and the outer edge circumference of each grinding wheel sheet can be adjusted by notches to form different contour shapes.

The machining tool is used for grinding a workpiece in a machine tool. The tool includes at least a first machining portion having particles of a harder material than the material of the workpiece to be machined, the particles being arranged in a binder, and at least a second machining portion having particles of smaller diameter than the first machining portion, and of a harder material than the material of the workpiece to be machined, the particles of the second portion being arranged in an identical binder to that of the first portion or in a different binder.

The machining tool is used for grinding a workpiece in a machine tool. The tool includes at least a first machining portion having particles of a harder material than the material of the workpiece to be machined, the particles being arranged in a binder, and at least a second machining portion having particles of smaller diameter than the first machining portion, and of a harder material than the material of the workpiece to be machined, the particles of the second portion being arranged in an identical binder to that of the first portion or in a different binder.

An apparatus (1) for finishing surfaces comprises a support body (10) configured to removably engage a finishing member (20), and a displacement device (40) configured to move the support body (10) in space according to at least one degree of freedom. The apparatus (1) provides at least one shaping station (250) at which the raw member (20) is positioned to give it a predetermined shape, in such a way to obtain a finishing member, in particular a finishing member (20) which is, therefore, positioned at the three-dimensional surface to be finished to finish the same.

An apparatus (1) for finishing surfaces comprises a support body (10) configured to removably engage a finishing member (20), and a displacement device (40) configured to move the support body (10) in space according to at least one degree of freedom. The apparatus (1) provides at least one shaping station (250) at which the raw member (20) is positioned to give it a predetermined shape, in such a way to obtain a finishing member, in particular a finishing member (20) which is, therefore, positioned at the three-dimensional surface to be finished to finish the same.

A machine tool comprises first and second support arms, and a rigid structure which couples the first support arm to the second support arm. A first rotary drive is operable to rotate the first support arm and the rigid structure relative to each other about a first rotational reference axis, and a second rotary drive is operable to rotate the second support arm and the rigid structure relative to each other about a second rotational reference axis, wherein the first and second rotational reference axes are parallel and spaced apart by a fixed distance. A control arrangement is configured to control the first and second rotary drives such that a workpiece mount carried by the second support arm follows a predetermined path relative to a tool mount carried by the first support arm in a plane perpendicular to the rotational reference axes.

A machine tool comprises first and second support arms, and a rigid structure which couples the first support arm to the second support arm. A first rotary drive is operable to rotate the first support arm and the rigid structure relative to each other about a first rotational reference axis, and a second rotary drive is operable to rotate the second support arm and the rigid structure relative to each other about a second rotational reference axis, wherein the first and second rotational reference axes are parallel and spaced apart by a fixed distance. A control arrangement is configured to control the first and second rotary drives such that a workpiece mount carried by the second support arm follows a predetermined path relative to a tool mount carried by the first support arm in a plane perpendicular to the rotational reference axes.