A linear saw, machining method using the same and numerical controlled machining device. The linear saw has: a machining part (1), for cutting a machining object in a linearly extending direction of the linear saw, and generating a slot on the machining object; and the linear saw further includes a space-keeping part (2) arranged such that the whole linear saw does not contact the slot or is not subject to an acting force of the slot when the space-keeping part passes through the slot. As the linear saw is provided with a space-keeping structure, the linear saw has time and space to recover from a deformation generated by cutting the machining object, thus effectively preventing accumulated errors, and greatly improving the position precision of the machining seam.

A power tool includes a motor housing having a motor configured to rotate an output shaft about a drive axis and a gear housing defining a gear compartment. A pinion gear is supported by the gear housing that is coupled to the output shaft for rotation about the drive axis. A bevel gear is supported by the gear housing for rotation about a bevel axis and includes a geared portion that is meshingly engaged with the pinion gear. A crank pin extends from the same side of the bevel gear as the geared portion at a position offset from the bevel axis. An articulating housing is pivotably supported by the gear housing for pivotal movement about the bevel axis. A plunger member is supported by the articulating housing for reciprocating movement along a reciprocating axis. The plunger member includes a yoke end portion coupled to the crank pin.