Movement device for moving an object along a movement surface, including: a percussion mass and suspension device, connecting the percussion mass to object, moving to move the percussion mass repeatedly along a closed path, a head, constrained to the object, to interfere with the closed path, the percussion mass interfering with the head along an advance line and direction, connection device for connecting the object to the movement surface to create friction between the object and movement surface. The percussion mass interfering with the head causes a reaction force exceeding the friction, capable of moving the object relative to the movement surface. The percussion mass not interfering with the head along the closed path does not cause reaction forces exceeding the friction, capable of moving the object relative to the movement surface.

A cooling lubricant supply device for supply of a cooling lubricant to a grinding wheel is rotatably mounted as a tool on a grinding spindle of a processing unit in a grinding machine. The device has a feed shoe, which is mounted at least indirectly on a grinding spindle housing and seated on a circumferential surface of the grinding wheel and which has a seating surface facing the grinding wheel. The seating surface has a shape substantially complementary with the circumferential surface of the grinding wheel and is provided centrally with a pocket-like recess into which the cooling lubricant can be fed under pressure. A spring mechanism is provided, by which the feed shoe is biased with the seating surface thereof against the circumferential surface of the grinding wheel.

A handheld sanding device according to the present invention includes: a power generation unit configured to generate rotating force for sanding operation; a power transmission unit configured to be coupled to the power generation unit, and to transmit the rotating force generated by the power generation unit; a sanding unit configured to be rotated by the rotating force, transmitted through the power transmission unit, in order to sand a sanding target surface; and a shaft coupling unit configured to connect the power transmission unit and the sanding unit to each other so that the sanding unit is freely inclined based on the power transmission unit, thereby improving the close contact between the sanding target surface and the sanding unit while making it easy to carry and also preventing the sanding target surface from being eccentrically worn during sanding operation.

The two piece spindle grinder fixture is adapted to minimize the size of the frame by a two piece spindle assembled into a frame having a bearing race formed between the frame and the two piece spindle. An angularity adjustable angle indicator mounted concentric with a spindle axis to allow the indicator to be adjusted relative to a part attached to the two piece spindle, A chuck or other holding tool may be mounted on the chuck end of the two piece spindle opposite a handle on a handle end.

An automatic adjustable stroke device for a random orbital machine has a housing with a central axis and a wall defining a cavity. A counterbalance shaft assembly is rotatably disposed at least partially within the cavity. A shaft portion of the counterweight shaft assemblies aligned with the central axis. A mounting assembly is disposed at least partially within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjuster couples the counterweight shaft with the mounting assembly. The stroke adjuster enables the mounting assembly to adjust its stroke upon rotation of counterweight shaft. The mounting assembly variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing. The stroke adjuster has a gear automatically adjusting the mounting assembly stroke.

The present document describes a blade sharpening system comprising a blade sharpening device, a blade holding apparatus and a controller operatively coupled to the blade sharpening device and said blade holding apparatus to control sharpening of said blade, and methods of using the same.

An adjustable stroke mechanism has a housing with a central axis and a wall defining a cavity. At least one counterweight is movably disposed, at least partially, within the cavity. A mounting assembly is disposed, at least partially, within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjustor couples the at least one counterweight with the mounting assembly. The stroke adjustor enables the counterweight and mounting assembly to move with respect to one another such that a distance between the counterweight and the mounting assembly may be variably adjusted which, in turn, variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing.

A grinding apparatus includes grinding wheel side vibrational displacement calculation devices that obtain a vibrational displacement of a grinding wheel resulting from a vibration in an approaching/separating direction of the grinding wheel; main spindle side vibrational displacement calculation devices that obtain a vibrational displacement of a workpiece generated by propagation of the vibration in the approaching/separating direction of the grinding wheel; a relative vibrational displacement calculation unit that obtains a relative vibrational displacement between the grinding wheel and the workpiece based on the vibrational displacement of the grinding wheel and the vibrational displacement of the workpiece that have been obtained; a position change unit that creates, based on the obtained relative vibrational displacement between the grinding wheel and the workpiece, a position change command to change a position of the wheel spindle stock; and a processing controller that grinds the workpiece W based on the created position change command.

By, according to the invention, designing a surface treatment tool with a grinding head (16, 17) with cylindrical rollers (18), so that the tool (16, 17, 18) is balanced by weight because the tool's centre of gravity is close to the tool's surface treatment area, the tool (18) will automatically adjust according to the surface (25) of the treated workpiece, regardless of the level of the surface. Hereby is achieved a previously unknown simple way to surface treat, be it flat and curved workpiece surfaces alike. Furthermore, the tool (16,17,18) is balanced by weight so that treatment pressure can be adjusted according to need.

An automatic adjustable stroke device for a random orbital machine has a housing with a central axis and a wall defining a cavity. A counterbalance shaft assembly is rotatably disposed at least partially within the cavity. A shaft portion of the counterweight shaft assemblies aligned with the central axis. A mounting assembly is disposed at least partially within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjuster couples the counterweight shaft with the mounting assembly. The stroke adjuster enables the mounting assembly to adjust its stroke upon rotation of counterweight shaft. The mounting assembly variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing. The stroke adjuster has a gear automatically adjusting the mounting assembly stroke.