Abstract: The invention relates to a device for damping vibrations and/or controlling the flexion of an object in machining, said device comprising at least one force exchange device which could be a force applying device or a damping device. A such force applying device is for applying a force having a force component directed at right angles to the surface of the object and/or for applying a moment to the object. A damping device of this type is for absorbing vibrations from the object and is adapted to absorb a force component directed at right angles to the surface of the object or to absorb a moment from the object.

Abstract: A wood-turning lathe includes a spindle and a drive shaft journalled to a headstock housing. A motor is mounted in the headstock housing, and includes a rotor. A torque converter includes a first wheel that co-axially surrounds the spindle and that is securely coupled to the rotor, a second wheel mounted securely on the drive shaft, and a belt trained on the first and second wheels, thereby increasing torque of the drive shaft. A speed change device includes a first pulley unit mounted on the drive shaft and defining a first belt-engaging surface, a second pulley unit mounted on the spindle and defining a second belt-engaging surface, and a non-elastic belt interconnecting the first and second pulley units and frictionally contacting the first and second belt-engaging surfaces.

Abstract: A speed change gear mechanism for lathes includes a driving shaft having a number of first gears securely mounted thereon to rotate therewith, a driven shaft including a number of second gears each rotatably mounted thereon via a bearing, and a chuck shaft including a number of third gears securely mounted thereon to rotate therewith. The number of the second gears is a sum of the number of the first gears and the number of the third gears. Each second gear is meshed with a corresponding one of the first gears and the third gears. A camshaft includes a cam formed thereon, the cam having a number of angular positions that correspond to different speeds of the chuck shaft. A clutch device has a first end selectively engaged with two of the second gears that respectively meshed wvith an associated first gear and an associated third gear to thereby determine a rotational speed of the chuck shaft.

Abstract: Positioning engaging members (27) are provided between a base table (10) and a turret (11) which is indexed relative to the base table (10) by a driving force of an indexing/tool turning motor (32) so as to be engageable with or disengageable from each other. The positioning engaging members (27) engage with each other to prevent the turret (11) from turning. Further, the driving force of the indexing/tool turning motor (32) is transmitted or not transmitted to the turret (11) by clutch pieces (31). The driving force of the indexing/tool turning motor (32) is transmitted to a turning tool (14) mounted on tool mounting portions (12) of the turret (11) via a power transmission member. The positioning engaging members (27) engage with or disengage from each other by an engaging unit.

Abstract: The present invention provides vibration damping method and apparatus that can damp vibration in more than one direction without requiring disassembly, that can accommodate varying tool dimensions without requiring re-tuning, and that does not interfere with tool tip operations and cooling. The present invention provides active dampening by generating bending moments internal to a structure such as a boring bar to dampen vibration thereof.