Abstract: A hole saw is movable about a rotational axis in a cutting direction to cut into a workpiece. The hole saw includes a cylindrical body having a sidewall with a first end and a second end opposite the first end. The cylindrical body also includes a gullet formed in the sidewall between a leading surface, a trailing surface, and a bottom surface of the sidewall. The trailing surface defines a portion having a first radius. The bottom surface has a second radius. The first radius is larger than the second radius. The hole saw also includes a cutting tooth coupled to the first end of the sidewall adjacent the gullet.

Abstract: The present disclosure provides an axle device and a boring tool. The axle device includes a main shaft, an expanding unit, a drill, and an engaging unit. The main shaft is magnetic. The expanding unit includes a cone blocking member and an expanding member. The cone blocking member has an inclined plane. The expanding member is limited at the main shaft and includes a plurality of pawls, wherein the pawls are against the inclined plane. The engaging unit includes a rotating member and an engaging element. The rotating member is screwed on the main shaft. The engaging element engages the drill with the rotating member. When the rotating member rotates and moves toward a first direction, the engaging element correspondingly brings the drill and the cone blocking member toward the first direction, such that the inclined plane of the cone blocking member expands the pawls outwardly.

Abstract: A friction-welded ground assembly that includes an alloy substrate with a clearance hole; an aluminum alloy weld nut having a bolt bore and an outer wall; and a grounding bolt. The bore is located substantially within the clearance hole and a portion of the outer wall is joined to the substrate at a friction-welded attachment. Further, the bolt is threaded within the bore. In addition, a method for making a ground includes the steps: rotating an aluminum alloy weld nut having an outer wall at a predetermined speed; lowering the outer wall of the rotating nut into contact with an aluminum alloy substrate to generate a frictional force for a friction time; arresting the rotation of the nut; and applying an axial forging force to the outer wall and the substrate for a forging time.

Abstract: A positioning aid is disclosed for a core drilling machine, having a core drill for creating a hollow-cylindrical drill hole. The positioning aid includes a light source for creating a centring pattern on a workpiece. The positioning aid is fastened in a releasable and centered manner to the core drilling machine. The positioning aid may include a laser pointer, which is releasably fastened to a centring pin.

Abstract: Three systems for the destruction of the data storage portion of electronic media storage devices such as hard disk drives, solid state drives and hybrid hard drives. One system utilizes a mill cutter with which the hard drive has relative motion in the direction of the axis of the mill cutter to destroy the data storage portion. A second system utilizes a laser to physically destroy the data storage portion. The third system utilizes a chemical solvent to chemically destroy the data storage portion.

Abstract: A forestry machine includes a frame; a felling saw carried by the frame; and a speed readiness indicator associated with a saw head of the felling saw. The speed readiness indicator includes at least one sensor, a visual indicator and a controller. The one or more sensors provide an indication of a rotational speed of the saw head. The controller is coupled with each sensor and the visual indicator. The controller receives an input signal from each sensor and actuates the visual indicator to indicate an approximate rotational speed of the saw head.

Abstract: A device for cutting truncated dowels from a board, with a device including a one-piece cutting body shaped as a hollow cylinder and having a concentric clamping shank. The cutting body is provided with only one recess which forms a knife edge, with the recess opening toward a front of a cutting body and merging into a wider dowel ejection opening. The cutting body has an inside annular cutting edge which determines the larger outside diameter of the truncated dowel to be cut and from which the knife edge originates. The inside circumferential surface of the jacket tapers conically toward the clamping shank, and the knife edge is inclined obliquely inwardly in accordance with the conicity of the inside circumferential surface.

Abstract: A hole producing assembly for a power drill including an adapter having one end operationally connected to the power drill such that the power drill rotates the adapter about an axis of rotation, the other end of the adapter includes a threaded shaft having threads that are of the four-start type, a cutter which has threads thereon that are complementary to the four-start threads on the adapter so that the cutter is threadably connectable to the adapter, the cutter has a cutting projection extending from the base and terminating in a cutting edge, and a spacer positioned between on the shaft of the adapter to aid in removal of the cutter from the adapter after use.

Abstract: An improved hole saw is disclosed. A mandrel of the hole saw forms an elongated threaded body. The mandrel, at a first end forms a shank adapted to be secured in the chuck of a hand power drill or drill press. The second end of the mandrel forms an enlarged, radially extended, circular flange having a recessed axially aligned hole formed therein. The shank end of, for example, a quarter inch pilot-hole drill is secured in the flanged end of the mandrel by one or more set screws. The mandrel is inserted, shank end first, into the open serrated cutting end of a cylindrically shaped hole saw. The threaded shank end of the mandrel is screwed into a threaded base of the hole saw, the radially extended flange of the mandrel being mated to and tightened against the inside base end of the hole saw.

Abstract: A dowell making machine which has a central hollow shaft which is adapted for rotation on connection to a driving means and has associated therewith an end plate which is co-axial with the shaft and adapted to rotate therewith, the end plate having a central aperture larger in diameter than the dowell to be made and having cutting blades thereabout, a cylindrical saw blade is associated with the tool and is co-axial with the axis of the aperture of the shaft and is located between the end plate and the shaft, the arrangement being such that timber passing through the end plate is force formed to a substantially cylindrical shape and, on passing through the cylindrical blade, is sized to form a dowell.

Abstract: A new and improved hole saw construction providing a low cost hole saw mandrel with improved driving capability. A unique drive washer cooperates with radial stiffening ribs on a hole saw blade to effect the improved driving capability.

Abstract: An integral hole saw and arbor construction having a one-piece stem formed by a shank, an intermediate drive plate and a reduced neck at the lower end. The reduced neck forms an annular shoulder with the bottom surface of the drive plate. An annular end cap formed with a central hole and an outer annular shoulder, is mounted concentrically on the stem in abutting engagement with the bottom surface and annular shoulder of the drive plate, with the reduced neck extending into the central hole of the end cap. An annular weld extends between the drive plate and end cap to firmly secure and integrally join the end cap on the stem. A cylindrical saw blade is seated in the annular shoulder of the end cap and is firmly secured and integrally joined to the end cap by a second annular weld. A setscrew is threadably mounted on the drive plate for adjustably clamping a pilot drill in an axial bore which is formed in and which extends throughout the stem.

Abstract: Hole saw consisting of a hardened metal tube with ground teeth at one end and a plastic cap at the other end.

Abstract: A drive collar is non-rotatably mounted for sliding movement on an arbor between working and release positions. In working position, the drive collar is disposed adjacent the base of a hole saw which is threadably mounted on an end of the arbor, and the collar and the hole saw are coupled for positively transmitting drive torque from the arbor to the saw. In release position, the drive collar is retracted from the saw and rendered inoperative for quick and easy assembly and disassembly of the saw and arbor.

Abstract: An arbor is provided for use with different size power tool chuck jaws and has a main body section of enlarged cross section relative to a shank of the arbor. The shank and main body section have a plurality of grooves therein with each groove longitudinally extending the length of the shank and into the adjoining main body section to define a continuous chuck jaw engaging surface which in the main body section of the arbor is of enlarged circumferential dimension relative to that of the shank drive surface for engaging different size chuck jaws in non-slipping positive driving relation.

Abstract: A quick-locking arbor, pilot drill, and hole saw assembly having particular utility with relatively small diameter hole saws in which one end of the pilot drill is received within a bore in the arbor, with a spring or other tension means surrounding the shank of the drill. The inserted end of the drill carries a washer and drill drive or sleeve, and the spring is trapped between the washer and a bushing which is held in the arbor body. A collar is carried on the pilot drill intermediate its ends and has camming surfaces integral therewith. The hole saw, being an elongate, hollow, cylindrical cutting member, has internal cam means which cooperate with the cam surfaces of the collar on the pilot drill so that upon relative rotation therebetween, the pilot drill is urged away from the arbor against the face of the spring or tension means, which is compressed between the washer and the end of the bushing, whereby the saw is locked between the end of the arbor and the collar.

Abstract: An improved means for locating the pilot drill of a hole saw assembly is disclosed. The assembly generally includes an arbor, which has a body and a spindle projecting from one end thereof, and a cup-shaped hole saw, with the arbor and the hole saw carrying cooperating cam and spring-loaded locking and driving means to draw one planar face of the arbor into secure flush engagement with the planar face of the base of the cup-shaped cutting member or hole saw itself. The forward face of the arbor has a recess therein, and one end of the pilot drill has a locating sleeve dimensioned so as to fit into the recess in the face of the arbor so that when the locking and driving means are utilized to draw the face of the arbor into flush contact with the face of the hole saw, the sleeve is trapped between the two faces, and the pilot drill is firmly located.