Abstract: A milling insert includes a polygonal tubular insert body which has: rake faces on one polygonal surface thereof, flanks composed of circumferential surfaces adjacent to the polygonal surface, and cutting edges defining a ridge line where the rake faces and flanks intersect each other as cutting edges. The rake faces have serrations where mount portions and valley portions are arrayed alternately to intersect the cutting edges. The ridge line has a waveform shape when the flanks are viewed from above. Bottom portions and top portions of the waveform are formed into concave circular arc portions and convex circular arc portions, respectively, and are alternately repeated. Both of the concave and convex circular arc portions are a ¼ circular arc or more to a ? circular arc or less. Each of the concave circular arc portions is unevenly located between the convex circular arc portions adjacent thereto.

Abstract: A drill includes a cutting edge. The cutting edge has a point angle which is continuously decreased from a center-position point angle A (herein, 0°<A<180°) at a center position to a maximum-diameter-position point angle of 0° at a maximum diameter position. The cutting edge has a relief angle which is continuously decreased from the center position to the maximum diameter position. The cutting edge of the drill has a relief angle at the maximum diameter position. Hence, the cutting edge also serves as a cutting edge for reaming. The ridgeline and relief face of the cutting edge have no corner, thereby providing good wear resistance.

Abstract: According to one implementation, a drill has at least one cutting edge. A projected shape of a passing area of a ridgeline of the at least one cutting edge when the at least one cutting edge is rotated around a tool axis becomes a line-symmetric and discontinuous line along a parabola, two parabolas, an ellipse or two ellipses. The projected shape is drawn on a projection plane parallel to the tool axis.

Abstract: A drill includes a cutting edge. The cutting edge has a point angle which is continuously decreased from a center-position point angle A (herein, 0°<A<180°) at a center position to a maximum-diameter-position point angle of 0° at a maximum diameter position. The cutting edge has a relief angle which is continuously decreased from the center position to the maximum diameter position. The cutting edge of the drill has a relief angle at the maximum diameter position. Hence, the cutting edge also serves as a cutting edge for reaming. The ridgeline and relief face of the cutting edge have no corner, thereby providing good wear resistance.

Abstract: A drill includes a cutting edge having a ridgeline. The ridgeline has a part of an ellipse and a straight line. It is assumed that the coordinates of a separation point of an ellipse portion from a straight line portion are (x0, y0). The straight line is a tangent to the ellipse at the separation point. It is assumed that a1 is an area from a tip end of the drill to x0, a2 is an area from x0 to the origin of the ellipse, and a3 is a negative area, along the x-axis. The ridgeline of the cutting edge is formed straight along the tangent in the area a1, and is formed along the ellipse in the area a2. A margin is formed in the area a3 continuously from a relief face of the cutting edge.

Abstract: A tightening device and a tightening method are able to check that a fastening member has been fastened to a desired set torque or greater after being tightened, without loosening the fastening member.

Abstract: A tightening device is able to check that a fastening member has been fastened to a desired set torque or greater after being tightened, without loosening the fastening member.

Abstract: The object of the invention is to provide a sleeve removal tool that is able to easily remove a sleeve from a tap without damaging the sleeve. The sleeve removal tool has a first fastening member and a second fastening member. The first fastening member has a first contact surface and inner screw section, and is formed in a cylindrical shape. The first contact surface comes in contact with the flange of the sleeve all around one ring shaped surface. An inner screw section is provided such that it protrudes in the axial direction from the first contact surface. The second fastening member has a second contact surface and outer screw section, and is formed in a cylindrical shape. The first contact surface comes in contact all around the other ring shaped surface of the flange.

Abstract: A blast processing device includes a first nozzle, a second nozzle, and a moving mechanism. The first nozzle blasts a blasting material toward a workpiece, using first compressed air. The second nozzle blasts second compressed air for adjusting a diffusion range of the blasting material. The moving mechanism moves the first nozzle and the second nozzle over the workpiece.

Abstract: The object of the invention is to stably spray cutting fluid in a good mist form, when cutting fluid and air are supplied from the surrounding area and cutting fluid is sprayed in a mist form from the tip end section of a rotary cutting tool. The rotary cutter of the present invention sequentially feeds a mixture of cutting fluid and air through a supply pipe 4, first supply path b in a cover 3, second supply paths c, d in a chuck 2, a hollow center cavity (front throttle chamber d, throttle 24a, and rear throttle chamber e) in the chuck, and a third supply path g in a rotary cutting tool 1.

Abstract: A drill includes a pair of main cutting edges extending from a distal portion of the drill to a position close to a proximal end of the drill to entirely define a two-edge configuration, and a pair of auxiliary cutting edges extending between positions at the distal and proximal sides of a maximum diameter position to partly define a four-edge configuration. A ridgeline of each auxiliary cutting edge is located within an angle smaller than 90° from a ridgeline of the corresponding main cutting edge toward the rear in a rotation direction of the drill. The point angle of the auxiliary cutting edges increases at a higher rate than the point angle of the main cutting edges in a predetermined range from the maximum diameter position toward a distal end of the drill.

Abstract: An air control device includes an air suction port, air discharge ports, and an air control system. The air suction port takes in air. The air discharge ports discharge the taken-in air. The air control system discharges the air through the air discharge ports alternately for respective preset times. An air control method includes: taking in air; and discharging the air alternately through air discharge ports for respective preset times.

Abstract: A tool feeding mechanism for a tool driving device includes a cylinder mechanism, a positioning mechanism, and a holding mechanism. The cylinder mechanism moves a tool rotation driving device to hold and rotate a tool, in a tool axis direction on an exterior of a cylinder tube using power of a piston. The positioning mechanism is connected to the cylinder tube side of the cylinder mechanism either directly or indirectly in order to position the cylinder mechanism relative to a workpiece. The holding mechanism holds the tool rotation driving device such that the power of the piston in the cylinder mechanism is transmitted to the tool rotation driving device.

Abstract: A drill driving apparatus includes a tool driving mechanism and a driving mechanism fixing instrument. The tool driving mechanism is configured to hold a tool and apply a rotation operation and a feeding operation in a tool axis direction to the tool. The driving mechanism fixing instrument has a through hole through which the tool passes. The driving mechanism fixing instrument is configured to be inserted detachably into a guiding through hole in order to fix the tool driving mechanism to a drill jig in which the guiding through hole is formed.

Abstract: Disclosed is a milling insert, in which cutting resistance is reduced, wear advance of cutting edges is suppressed, and elongation of a lifetime is achieved, and is an indexable face milling cutter. When flanks 22 are viewed from the above, a cutting edge ridge line 23 is formed into a waveform shape, in which bottom portions are formed into concave circular arc portions 23b, top portions are formed into convex circular arc portions 23a, and the concave circular arc portions 23b and the convex circular arc portions 23a are alternately repeated, both of the concave circular arc portions and the convex circular arc portions are a ¼ circular arc or more to a ? circular arc or less, and each of the concave circular arc portions is unevenly located at a position close to one of two convex circular arc portions adjacent to the concave circular arc portion, and far from other of the two convex circular arc portions.

Abstract: A cutting tool cover set to a cutting tool which includes a hollow shaft body and at least one insert attached to an end face of the shaft body and cuts by bringing the insert into contact with a work while rotating the shaft body. The cutting tool cover includes: a body portion fixed to a top end portion of the shaft body; and an extension portion extended outward from the circumferential edge of the body portion in the entire circumference of the top end portion of the body portion to cover the surface of the work.

Abstract: This fastening tool supports a key wrench such that it cannot rotate at a location where a hexagonal hole on the tip end part comes in contact with a nut, so that even though the key wrench is pressed backward as a pin is screwed into the nut, a key wrench holder remains in a state of contact with the nut. After the pin has been screwed into the nut, the nut is twisted off at a weak section. The further the pin is screwed into the nut, the key wrench holder supports the key wrench at a location closer to the pin, which keeps the amount of torsional deformation of the tip end part of the wrench small, and thus makes it possible to securely engage with the pin, and in the final state of the fastening work, it is possible to completely twist off the twist-off type nut, which requires a large torque.

Abstract: Provided is a step-shaped drill bit including at least two stepped cutting edges that are axially provided. A cutting edge of a first step from a tip is formed so as to satisfy at least one of the following conditions. That is, a number of blades is smaller, a point angle of the cutting edge is larger, or a clearance angle of the cutting edge is larger than that of cutting edges of a second and subsequent step(s). As a result, a thrust resistance during a perforation can be reduced compared with a case in which the first step cutting edge is formed such that the number of blades, the point angle of the cutting edge and the clearance angle of the cutting edge are the same as those of the second and subsequent step(s).

Abstract: Disclosed is a cutting tool, including: a cutting edge including a coating from a rake face to a flank face, and has a relief angle of not less than 15 degrees, a material of the coating having a higher wear resistance than a base material of the cutting edge, and during cutting of a work, an edge of the coating on the rake face at a top of the cutting edge is worn by friction with the work; with a progress of a wear inward in a radial direction, an edge of the coating on the flank face at the top of the cutting edge is removed by friction with the work to expose the base material thereunder; and the exposed base material is worn by friction with the work to retract the flank face inward in the radial direction.

Abstract: The object of the invention is to provide a sleeve removal tool that is able to easily remove a sleeve from a tap without damaging the sleeve. The sleeve removal tool has a first fastening member and a second fastening member. The first fastening member has a first contact surface and inner screw section, and is formed in a cylindrical shape. The first contact surface comes in contact with the flange of the sleeve all around one ring shaped surface. An inner screw section is provided such that it protrudes in the axial direction from the first contact surface. The second fastening member has a second contact surface and outer screw section, and is formed in a cylindrical shape. The first contact surface comes in contact all around the other ring shaped surface of the flange.