A machine tool (1) includes a spindle (32) supported on a support surface (37a) of a support body (37) with such an orientation that the longitudinal axis of the spindle extends along the support surface (37a). The spindle (32) is movable in a vertical direction that is perpendicular to the longitudinal axis of the spindle (32). The support body (37) is provided with a ventilation hole (80) extending through the support body (37) between the support surface (37a) and a surface (37b) facing in the direction opposite to the support surface (37a), to open toward the spindle (32).

A power tool having air cooling for the components of the power tool. Here, the power tool includes exhaust openings for discharging the consumed air to the environment of the power tool. A method for protecting a user of a power tool from dust is also provided. The invention is associated with the essential advantage that air flows that exist as a result of the air cooling inside the power tool are exploited in order to blow the dust that accrues during operation of the power tool in a spatial direction “away from the user”. In a particularly preferred configuration, the air blown out can form an air curtain as a dust shield, which protects the user effectively from dust in that the air curtain keeps the dust away from the user and their airways.

The present invention relates to a cooling system comprising a spray unit for spraying a coolant. The present invention further relates to a machining device which comprises a cooling system of this type. The spray unit comprises a flow guide which is coupled on one side to a chamber and is coupled on the other side to one or more channels, where the chamber, the flow guide and the plurality of channels form a closed system for spraying from the channels pressurized coolant fed to the chamber, where the flow guide, the plurality of elongated channels and the chamber are manufactured as an integral part.

A device for connecting a cooling nozzle to a cooling lubricant supply for a grinding machine includes a central axis, a housing arranged for receiving the cooling nozzle, a rotary-linear transmission and a tube section. The rotary-linear transmission has a drive element, pivotable about the central axis, and a manual lever fixed to the drive element. The tube section is rotationally fixed in the housing and movable along the central axis by the rotary-linear transmission to be pressed against the cooling nozzle. The rotary-linear transmission may be a self-locking transmission. The drive element may have a thread structure which extends over less than a full revolution.

A rotary table (1) includes a base body (10), a worm wheel (21), an inner ring (22), a plurality of rolling elements, and a worm screw unit (30). The worm screw unit (32) includes a worm screw (31) and a worm screw housing (32). The worm screw housing (32) has an opposing surface that faces an outer circumferential surface (21B) of the worm wheel (21). The worm screw housing (32) includes a flange portion (325) that protrudes from the opposing surface and covers a side face (215A) that, of the first gear (215) facing the opposing surface, is on the opposite side from the base body (10) in the axial direction of the worm wheel (21).

A rotary table (1) includes a base body (10), a worm wheel (21), an inner ring (22), a plurality of rolling elements, and a worm screw unit (30). The worm screw unit (32) includes a worm screw (31) and a worm screw housing (32). The worm screw housing (32) has an opposing surface that faces an outer circumferential surface (21B) of the worm wheel (21). The worm screw housing (32) includes a flange portion (325) that protrudes from the opposing surface and covers a side face (215A) that, of the first gear (215) facing the opposing surface, is on the opposite side from the base body (10) in the axial direction of the worm wheel (21).

A textured surface in an outer surface of a tool holding section of a tool holder for increasing a surface area of the outer surface for dissipating heat from the tool holding section. The textured surface can comprise grooves around the outer surface of the tool holding section with a height and a width. Notches can be provided in sides of the grooves to further increase the surface area of the outer surface for dissipating heat from the tool holding section.

An impact driver includes a motor, a spindle, a hammer externally and coaxially mounted on the spindle to receive rotation of the spindle and move relative to the spindle in an axial direction, an anvil in front of the hammer and coaxial with the spindle to be struck by the hammer in a rotation direction, and a hammer case accommodating the spindle, the hammer, and the anvil, allowing a front end of the anvil to protrude frontward from the hammer case, and filled with grease. The spindle includes a grease supply path located in the spindle and open in a sliding surface of the spindle on which the hammer slides to allow grease to be supplied to the sliding surface, and an accelerator in the spindle to accelerate a flow of the grease onto the sliding surface along the grease supply path in response to rotation of the motor.

Spindle for carrying out machining assisted by non-ultrasonic axial oscillations, including a tool-bearing shaft, and an exciting portion, for subjecting the shaft to non-ultrasonic axial oscillations, especially during its rotation. The exciting portion including a first exciting stage, having at least one piezoelectric actuator, and a second exciting stage, having at least one piezoelectric actuator, having a non-zero axial overlap with the first exciting stage, the actuators of the two stages being arranged so that their effects add.

A rotation indexing device includes a rotary body having a main shaft rotatably supported via a bearing in an accommodating hole of a frame and a table part provided on one end-side of the main shaft, a workpiece or a jig for attaching the workpiece being attached to the table part; an oil seal provided in a void portion, which is a portion on the one end-side relative to the bearing, in a space between the frame and the rotary body; a drive mechanism configured to rotationally drive the rotary body; and a holding mechanism for holding the rotary body at an indexed angular position during indexing processing. A dust seal is provided in the void portion on an opposite side to the bearing-side with respect to the oil seal.