Provided are a method for machining a plate material by using a linear saw, and a numerical control saw machine apparatus. The numerical control saw machine apparatus includes: two carrying mechanisms, which are connected to two ends of a linear saw respectively; at least one control motor, configured for adjusting a distance between the two carrying mechanisms; and a pair of vibration motors, configured for driving the vibration of the linear saw, wherein, the distance between the two carrying mechanisms is adjusted by the control motor based on a monitored change in a torque of the control motor.

A tool attachment, in particular hole saw, for a power tool having a driving axle that is drivable in oscillation. The tool attachment including a connecting device with which the tool attachment is attachable to the power tool such that the driving axle thereof and a tool axis essentially coincide. A work area has teeth, with the work area being at least partially circular in design and adjoining a hollow, cylindrical base. Openings are formed in the base, the openings constituting at least 60%, at least 80%, or at least 90% of the area of the base.

Wood core drilling bits for use in wood frame construction of structures in the residential and/or commercial market and sets of the same have a cylindrical barrel defining an axis of rotation and a first end that is open and a second end defined by a hub having a bore therethrough. The open end defines a plurality of cutting teeth and the cylindrical barrel defines a plurality of slots radially therethrough. The plurality of slots are positioned as points of a three-dimensional curve turning about the axis of rotation while moving parallel to the axis of rotation.

Wood core drilling bits for use in wood frame construction of structures in the residential and/or commercial market and sets of the same have a cylindrical barrel defining an axis of rotation and a first end that is open and a second end defined by a hub having a bore therethrough. The open end defines a plurality of cutting teeth and the cylindrical barrel defines a plurality of slots radially therethrough. The plurality of slots are positioned as points of a three-dimensional curve turning about the axis of rotation while moving parallel to the axis of rotation.

The invention provides a method of locating a position of an electrical fixture behind a panel by using an aperture cutting guide comprising a support plate and a guide tube having a longitudinal aperture. The support plate is formed with first holes and second holes. The selected second hole and the guide tube protruding through a cut-out of a panel are positioned at an axis of the fixture installation location. A hole cutting tool having a longitudinal rotatable element and a cutting member with cutting teeth is directed towards the cut-out. The rotatable element is movably received and guided by the tube's longitudinal aperture. An opening within the panel is cut by the cutting teeth, so that the guide tube is adapted to retain a proper orientation of the longitudinal rotatable element and to prevent the cutting teeth of the tool from drifting away from a predetermined orientation.

The invention provides a method of locating a position of an electrical fixture behind a panel by using an aperture cutting guide comprising a support plate and a guide tube having a longitudinal aperture. The support plate is formed with first holes and second holes. The selected second hole and the guide tube protruding through a cut-out of a panel are positioned at an axis of the fixture installation location. A hole cutting tool having a longitudinal rotatable element and a cutting member with cutting teeth is directed towards the cut-out. The rotatable element is movably received and guided by the tube's longitudinal aperture. An opening within the panel is cut by the cutting teeth, so that the guide tube is adapted to retain a proper orientation of the longitudinal rotatable element and to prevent the cutting teeth of the tool from drifting away from a predetermined orientation.

Provided are a method for machining a plate material by using a linear saw, and a numerical control saw machine apparatus. The numerical control saw machine apparatus includes: two carrying mechanisms, which are connected to two ends of a linear saw respectively; at least one control motor, configured for adjusting a distance between the two carrying mechanisms; and a pair of vibration motors, configured for driving the vibration of the linear saw, wherein, the distance between the two carrying mechanisms is adjusted by the control motor based on a monitored change in a torque of the control motor.

A hole saw with various teeth sets and/or sizes that overhang a sidewall is provided. In some embodiments, a large tooth overhangs an inner diameter of the sidewall to create a larger kerf than the sidewall's thickness. Similarly, a tooth set or variations in the circumferential directions of the teeth increase the kerf in a work-piece, either inward or outward. In various embodiments, one or both an enlarged tooth overhang and/or a set of the teeth increases the kerf of the hole saw relative to the sidewall thickness. This results in improved wear resistance, decreased heat on the teeth while cutting, and facilitates slug removal.

A hole saw with a substantially cylindrical body, a center axis of rotation, an inner surface, and an outer surface. A cutting edge defined by a plurality of ground set teeth arranged in a pattern includes a first group of teeth oriented at angles toward the center axis of rotation intermixed with a second group of teeth oriented at an angle away from the center axis of rotation. The teeth angled away from the center axis of rotation are oriented at substantially the same angle and the teeth angled toward the center axis of rotation are oriented with each progressive tooth of the first group have an increasing angle relative to a prior tooth of the first group.

A tool attachment, in particular hole saw, for a power tool having a driving axle that is drivable in oscillation. The tool attachment including a connecting device with which the tool attachment is attachable to a power tool such that the driving axle thereof and a tool axis essentially coincide. A work area has teeth that are at least partially circular in design and adjoin a hollow, cylindrical base. At least two openings formed in the base, the at least two openings constitute at least 60%, at least 80%, or at least 90% of the area of the base.