A drill bit, e.g., a serpentine drill or an auger bit, includes a circumferential chip removal groove helically about a drill axis and a centering tip having a conical shape with an apex on the drill axis. The centering tip has a lateral cone surface that has a taper angle with a centering tip helical thread which spirals helically from the apex down the centering tip in a thread direction of rotation at a tip thread pitch. At least one tip recess is included in a side of the centering tip which provides a cutting edge, and which has a chip transporting shape and connecting to the circumferential external thread. The cone surface includes at least one step in the taper angle of the lateral surface with each step starting at a step-start position and the at least one step continues about the drill axis at least 90 degrees.

A drill bit, e.g., a serpentine drill or an auger bit, includes a circumferential chip removal groove helically about a drill axis and a centering tip having a conical shape with an apex on the drill axis. The centering tip has a lateral cone surface that has a taper angle with a centering tip helical thread which spirals helically from the apex down the centering tip in a thread direction of rotation at a tip thread pitch. At least one tip recess is included in a side of the centering tip which provides a cutting edge, and which has a chip transporting shape and connecting to the circumferential external thread. The cone surface includes at least one step in the taper angle of the lateral surface with each step starting at a step-start position and the at least one step continues about the drill axis at least 90 degrees.

A cylindrical drill bit includes at least one set of circumferential cutting edges positioned at a circumference of the drill bit; the circumference is centred to a longitudinal rotational axis; each set of circumferential cutting edges includes at least two circumferential cutting edges; and the at least two circumferential cutting edges have a mutually different radial distance from the longitudinal rotational axis.

A cylindrical drill bit includes at least one set of circumferential cutting edges positioned at a circumference of the drill bit; the circumference is centred to a longitudinal rotational axis; each set of circumferential cutting edges includes at least two circumferential cutting edges; and the at least two circumferential cutting edges have a mutually different radial distance from the longitudinal rotational axis.

A wood drill includes a clamping portion for connecting, for conjoint rotation, to a tool fitting of a portable power tool, and a head portion which is provided with a centering geometry. The clamping portion is formed at a first end, remote from a workpiece, and the head portion is formed at a second end, close to a workpiece, of the wood drill. The clamping portion is connected to the head portion via a shank portion. A maximum outside radius of the head portion is greater than a maximum outside radius of the shank portion. The head portion has at least one main lip with at least two stages for introducing a bore with a predefined inside radius into a workpiece. An outside radius of a main lip base is less than 60%, preferably less than 50%, of an outside radius of the head portion.

A wood drill includes a clamping portion for connecting, for conjoint rotation, to a tool fitting of a portable power tool, and a head portion which is provided with a centering geometry. The clamping portion is formed at a first end, remote from a workpiece, and the head portion is formed at a second end, close to a workpiece, of the wood drill. The clamping portion is connected to the head portion via a shank portion. A maximum outside radius of the head portion is greater than a maximum outside radius of the shank portion. The head portion has at least one main lip with at least two stages for introducing a bore with a predefined inside radius into a workpiece. An outside radius of a main lip base is less than 60%, preferably less than 50%, of an outside radius of the head portion.

The present invention is for a handle system for a woodworking tool to allow both the safe stowage of a woodworking tool and the operational use of the woodworking tool. A handle configured with a first collet receiver and a second collet receiver interconnected at either end of a generally hollow longitudinal handle. The collet receivers are adapted for receiving and interconnecting with a collet, and the collet is configured to receive and hold a woodworking tool therein. The first collet receiver enables the stowage of the woodturning tool within the longitudinal handle, and the second collet receiver enables the use of the woodturning tool in a working configuration which constrains the woodturning tool extending axially away from the longitudinal handle.

The present invention is for a handle system for a woodworking tool to allow both the safe stowage of a woodworking tool and the operational use of the woodworking tool. A handle configured with a first collet receiver and a second collet receiver interconnected at either end of a generally hollow longitudinal handle. The collet receivers are adapted for receiving and interconnecting with a collet, and the collet is configured to receive and hold a woodworking tool therein. The first collet receiver enables the stowage of the woodturning tool within the longitudinal handle, and the second collet receiver enables the use of the woodturning tool in a working configuration which constrains the woodturning tool extending axially away from the longitudinal handle.

A spade drill bit includes a shank extending along an axis from a rear end to a front end, the rear end configured to be coupled to a tool holder of a power tool, a blade including a paddle extending along the axis with a front portion and rear portion coupled to the front end of the shank, and a tip coupled to the front portion of the paddle. First and second primary cutting edges are disposed on a front edge of the front portion of the paddle and extend radially outward from the tip. At least the rear portion of the paddle is composed of a first steel alloy. The primary cutting edges are composed of a second steel alloy that has a greater hardness than the first steel alloy.

A spade drill bit includes a shank extending along an axis from a rear end to a front end, the rear end configured to be coupled to a tool holder of a power tool, a blade including a paddle extending along the axis with a front portion and rear portion coupled to the front end of the shank, and a tip coupled to the front portion of the paddle. First and second primary cutting edges are disposed on a front edge of the front portion of the paddle and extend radially outward from the tip. At least the rear portion of the paddle is composed of a first steel alloy. The primary cutting edges are composed of a second steel alloy that has a greater hardness than the first steel alloy.