The present invention provides a linear saw, and a machining method and a numerical control machining device that use the linear saw. The linear saw includes a machining part, used for cutting a workpiece in a linear extension direction of the linear saw and forming a machined slot in the workpiece. The linear saw further includes a space-keeping part, which is disposed so that the entire linear saw does not contact the machined slot or is not subjected to an acting force from the machined slot when the space-keeping part passes through the machined slot. Because the linear saw has a space-keeping structure, the linear saw has time and space to recover from deformation produced after cutting a workpiece, thereby efficiently preventing an accumulated error and greatly improving position precision of a machined gap.

A reciprocating saw blade that includes an elongated blade body defining an inner end and a distal end, a cutting edge located on one side of the blade body and extending between the inner and distal ends thereof and a tang located at the inner end of the blade body. The tang projects from the blade body at an acute angle of at least about 3° relative to a line tangent to an inner end of the cutting edge. The cutting edge includes a portion defining a substantially curved contour and optionally can include at least one further portion defining a non-curved contour.

A reciprocating saw blade including a body, an attachment portion, a cutting portion formed on the body including a plurality of cutting teeth, and a plunge point for initiating a plunge cut including a plunge tooth and a leading gullet between the plunge tooth and a first tooth of the plurality of cutting teeth. A first angle of the rake face of the plunge tooth is measured through the plunge tooth. A second angle of the rake face of the first cutting tooth is measured through the first cutting tooth. One of the first angle and the second angle is greater than 90 degrees and the other is less than 90 degrees. At least the first cutting tooth is set. The rake face defining the first angle is spaced from the rake face defining the second angle by a distance greater than the pitch of the plurality of cutting teeth.

A saw blade can include a blade body having a cutting edge defined by multiple teeth. The teeth can be disposed in a repeating pattern including a raker tooth, a first set tooth having a light offset to a right side of the blade body, a second set tooth having a heavy offset to the left side of the blade body, a second raker tooth, a third set tooth having a light offset to the left side, and a fourth set tooth having a heavy offset to the right side of the blade body. Each tooth can include a tip, rake face, gullet having a gullet depth, and one or more clearance surfaces. The pitch distance and gullet depth of the heavy offset teeth can be less than the pitch distances and gullet depths of the remaining teeth to provide an increased amount of strength for the heavy offset teeth.

A method of manufacturing a saw blade includes providing a saw blade body, forming a plurality of gullets and a first portion of a plurality of tooth bodies in the saw blade body with each gullet positioned between adjacent tooth bodies, and forming a second portion of the plurality of tooth bodies in the saw blade body separate to forming the plurality of gullets and the first portion of the plurality of tooth bodies in the saw blade body.

A saw blade includes a body having a thickness, an attachment portion formed on the body, and a plurality of cutting teeth formed on the body. The attachment portion is configured to connect the saw blade to a power tool. Each cutting tooth of the plurality of cutting teeth includes a tip defining a plane that extends along the thickness of the body, a rake face extending from the tip, and a relief face extending from the tip opposite the rake face. A first cutting tooth of the plurality of cutting teeth is set in a first direction relative to the body. A second cutting tooth of the plurality of cutting teeth is set in a second direction opposite the first direction relative to the body. The planes defined by the tips of the first and second cutting teeth are generally parallel.

A saw blade blank includes a body having an edge and an attachment portion formed on the body. The attachment portion is configured to connect to a power tool. A first portion of the edge is set in a first direction relative to the body. A second portion of the edge is set in a second direction opposite the first direction relative to the body. No cutting teeth are formed on the edge of the body.

A method of manufacturing a saw blade includes providing a saw blade body having an edge, forming a plurality of tooth bodies that defines a plurality of gullets in the saw blade body, coupling a cutting member to the edge of the saw blade body, and shaping the cutting member to form a cutting tooth after the cutting member is coupled to the edge. Each one of the plurality of tooth bodies defines an undercut portion positioned between adjacent tooth bodies. The cutting tooth includes a rake face extending from a tip of the cutting tooth toward the saw blade body and a relief face extending from the tip toward a second end of the cutting tooth sloping toward the saw blade body.

A saw blade including a body, a plurality of cutting teeth, and a plurality of gullets. The plurality of cutting teeth formed on the body. Each cutting tooth includes a first end and a second end. The plurality of gullets is formed between the plurality of cutting teeth. Each gullet having an opening defined between the first end of one tooth of the plurality of cutting teeth and the second end of an adjacent tooth of the plurality of cutting teeth. Each opening has an opening width and a gullet width. A ratio between he gullet width over the opening width is greater than or equal to 1.2:1.