A hole cutter can include a cylindrical blade body with a cutting edge and one or more axially-elongated apertures. Each axially-elongated aperture can include a first fulcrum axially spaced from the cutting edge, and a second fulcrum axially spaced further away from the cutting edge than the first fulcrum. The blade body can also include a third fulcrum defined by a second aperture different from the one or more axially-elongated apertures. The third fulcrum may be spaced closer to the cutting than the first and second fulcrums. A lever, such as a screw driver, can be inserted into the apertures and placed against each of the fulcrums to lever slugs out of the interior of the blade body. The third fulcrum may alternatively be defined by another axially-elongated aperture that is located a different distance from the cutting edge than the axially-elongated aperture containing the first and second fulcrums.

A mandrel assembly for attaching a hole saw and a pilot drill bit to an electric drill is disclosed. The mandrel assembly has a self-clearing feature that removes the plug without removing the mandrel from the drill chuck. The mandrel assembly includes a threaded shaft having a first end for attachment to a drill chuck, and a second end for receiving hole saw. The hole saw has a base disposed toward the chamfered end with the base having an opening therethrough and an ejection rod disposed substantially parallel to the threaded shaft between the chamfered end and the base. The ejection rod matingly engages and passes through the opening. When the drill bit is reversed, the ejection rod enters the interior space of the hole saw and clears the plug from the interior space of the hole saw.

A stationary machine tool for machining, in particular core drilling, comprising a tool stand with a first tool stand housing interior. A chip guidance system comprises a magnet, wherein the magnet is arranged in the first tool stand housing interior such that chips produced by a machining process and entering the first tool stand interior are deflected by the chip guidance system.

A holesaw assembly can include a holesaw, a pilot drill, an arbor, and a retainer. The holesaw can include a base and a cylindrical wall coupled to the base. The cylindrical wall terminates away from the base in a cutting edge and defines an internal space. The drill bit can include a cutting tip and an elongate shaft portion. The arbor can include a first portion configured to be couplable with a tool holder of a power tool and a second portion configured to be coupleable with the holesaw. The arbor can be configured to receive the drill bit and facilitate movement of the drill bit between an extended position and a retracted position relative to the arbor while the drill bit remains coupled to the arbor. The cutting tip is closer to the first portion of the arbor in the retracted position than in the extended position. The retainer can be configured to selectively maintain the drill bit in the retracted position. Release of the retainer can allow movement of the drill bit from the retracted position toward the extended position.

A hole saw for quickly cutting holes through workpieces without stopping to eject cut material. The device includes a cylindrical body with cutting teeth on a first end side engageable with a workpiece and a base plate on a second end side engageable with a power tool. The cylindrical body has one or more discharge slots and a removable internal auger secures to the base plate. The one or more blades of the internal auger and ejection of cut material from any of the discharge slots on the cylindrical body and/or the base plate enable cutting deep holes that are not limited by the depth of the cylindrical body. The removable internal auger allows for maintenance and sharpening for an extended use.

An arbor for a hole saw has a shank having an internal chamber therein, a spring situated within the internal chamber, and a plunger configured to compress the spring, when under pressure, within the internal chamber, the plunger having a drill bit receiving slot. As a user applies force to the pilot drill bit extending from the plunger, the applied pressure forces the plunger into the internal chamber, compressing the spring. Once the pressure on the pilot drill bit is released, such as when the core is freed from surrounding material, the spring extends, forcing the plunger from the internal chamber and thereby forcing the core from the surrounding material and/or hole saw. In some examples, a release mechanism may be included to control the release of the plunger from the internal chamber.

The embodiments herein generally relate to a device for the removal of a hole saw plug including a device body, an actuator, and at least two pins. In response to the drill operating in a clockwise direction, the actuator is configured to move the pins toward the cavity. In response to the drill operating in a counterclockwise direction, the actuator is configured to move the pins outward from the cavity and toward the hole saw such that the pins contact a plug disposed within the hole saw, thereby applying a force on the plug such that the plug can be removed from the hole saw.

This invention is an improvement to the hole-cutting saw that is currently widely available in the market. A tiny cutting blade attached to the bottom inner wall of the hole saw to help shave out diameter of the cutout plug, and cone shaped pilot drill bit to reduce the friction between cutout plug and pilot drill bit. End result is the quick, easy separation of cutout plug from hole saw.

A holesaw arbor assembly includes an arbor body, at least one drive pin, a base support plate, a support surface, and a resilient member. The arbor body extends along an axis and has a threaded portion configured to engage a corresponding threaded portion of a holesaw. The drive pin is supported by the arbor body and is configured to engage an aperture in the base of the holesaw. The base support plate is disposed relative to the arbor body and is movable axially to support the base of the holesaw. The support surface is fixed relative to the arbor body and non-movable axially. The resilient member is positioned between the support surface and the base support plate, biasing the base support plate axially toward the base of the holesaw. This arrangement provides compliance as the holesaw is threaded onto the arbor, enabling alignment of the apertures with the drive pin and allowing the holesaw base to seat firmly against the base support plate in a manner that limits excessive tightening and reduces the potential for gaps.

A hole cutter has a cylindrical blade body including a cutting edge and one or more axially-elongated apertures formed within a side wall of the blade body. The axially-elongated aperture is configured to receive a lever, such as a screwdriver, therethrough. Each axially-elongated aperture includes a first fulcrum axially spaced adjacent to the cutting edge, a second fulcrum axially spaced further away from the cutting edge than the first fulcrum, and optionally a third fulcrum axially spaced between the first and second fulcrums. A lever, such as a screwdriver, can be inserted into the aperture and placed against each of the fulcrums to lever slugs out of the interior of the blade body.