A metal plate includes a machining subject surface. The metal plate includes a first holding portion designed to be held by a chuck and a second holding portion located at a position separated from the first holding portion and designed to be held by the chuck. The method for manufacturing the metal plate includes performing reference surface machining that machines a surface of the second holding portion that is to be held by the chuck into a predetermined shape in a state in which the first holding portion is held by the chuck. The method includes releasing the first holding portion from the chuck and holding the second holding portion with the chuck. The method also includes machining the machining subject surface in a state in which the second holding portion is held by the chuck.

A power tool chuck includes a body with a central bore extending along an axis and configured to receive a tool bit, a plurality of angled passageways, and a plurality of jaws received in the passageways and moveable between an axially forward and radially inward clamping position and an axially rearward and radially outward retracted position. At least one jaw has a rear end lying in a first plane transverse to the axis. A first key drive member coupled to a tail portion of the body is configured to be engaged by a second key drive member on a power tool output shaft to non-rotationally couple the body to the output shaft. The first key drive has a forward end lying in a second plane transverse to the axis. The second plane is axially forward of the first plane when the jaws are in the retracted position.

A bit holder has a shank at a proximal end thereof and a blind bit-accepting hole at a distal end thereof, shaped to receive a correspondingly-shaped tool bit. The bit holder has at least one locking mechanism comprising an opening defined in the bit holder, opening into a side of the bit-accepting hole. A locking element in the opening is moveable towards the opening to contact a tool bit in the bit-accepting hole. The bit holder has a sleeve around a body portion of the bit holder, overlying the opening and biased by a spring towards a normal position. The sleeve has an internal ramp angled to contact the locking element to urge the locking element towards the tool bit as the sleeve is moved into the normal position, and to accommodate the locking element when the sleeve is moved from the normal position against the force of the spring.

A holding pin protrudes from a first opening of a through hole, enters a hole formed in a tip tool, and holds the tip tool. A spring member energizes the holding pin. A bush is press-fitted in the through hole and supports the spring member at a first end portion thereof. An inner diameter of a second opening of the through hole is formed larger than an outer diameter of the bush. As a result of this, a second end portion of the bush is arranged to avoid contact with the second opening of the through hole.

A quick-change connecting mechanism and a quick-change screwdriver of the invention. Firstly, a connecting handle and an accommodating cavity are matched in a shaft-hole mode, during actual production and machining, the machining precision of round shafts and round holes is high, the matching and mounting precision of the round shafts and the round holes is much higher than that of hexagonal shafts and hexagonal holes, and thus the axial precision of the connecting handle or screwable tips is ensured after mounting; secondly, longitudinal locking bodies are arranged and longitudinally inserted into locking grooves in an abutting mode under the effect of a sliding sleeve, so that rotation torque is transmitted in the circumferential direction, and the torque of a connecting rod is transmitted to the connecting handle or the screwable tips. Meanwhile, the connecting handle is fixed in the mounting direction and is prevented from falling.

A device for transmitting a torque produced by a drill includes a shank having a first outer conical region, a groove region, a second outer conical region, and a plurality of first longitudinal grooves extending over the first outer conical region, the groove region, and the second outer conical region and having a plurality of second longitudinal grooves extending over the second outer conical region. A tool fitting has a rotary driving part. The rotary driving part has an inner conical region and an inner driver region where the inner driver region has a plurality of first inner rotary drivers with a first width and first depth and a plurality of second inner rotary drivers with a second width and second depth. The first depth and the second depth are identical and the second longitudinal grooves also extend over the first outer conical region and the groove region.

Instrument couplings and related methods are disclosed herein, e.g., for coupling a surgical instrument to a navigation array or other component. The coupling can reduce or eliminate movement between the instrument and the navigation array, improving navigation precision. The coupling can be quick and easy to use, reducing or eliminating the need for extra steps or additional tools to attach or detach the instrument from the coupling. In some embodiments, the single step of inserting an instrument into the coupling can automatically lock the instrument within the coupling in a toggle-free manner.

A hole-saw comprises a cylindrical body, a plate, a mandrel, and a clamping member. A cutting edge is formed at an open end of the body and is disposed about the body's rotational axis. The plate is disposed at an opposite end of the body, is rotationally coupled to the body, and is oriented perpendicular to the body's rotational axis. In one embodiment the cutting edge has at least one inner saw tooth. In another embodiment the cutting edge has at least one outer saw tooth. Other embodiments include a cylindrical body with a cutting edge at both ends. Either cutting edge can have an inner or an outer tooth to easily remove the plug. The pilot drill bit can have a burr to prevent jamming.

A metal plate includes a machining subject surface. The metal plate includes a first holding portion designed to be held by a chuck and a second holding portion located at a position separated from the first holding portion and designed to be held by the chuck. The method for manufacturing the metal plate includes performing reference surface machining that machines a surface of the second holding portion that is to be held by the chuck into a predetermined shape in a state in which the first holding portion is held by the chuck. The method includes releasing the first holding portion from the chuck and holding the second holding portion with the chuck. The method also includes machining the machining subject surface in a state in which the second holding portion is held by the chuck.

In order to improve the machining freedom of a workpiece while suppressing a cost increase, a tool rest for a machine tool includes a cutting tool holder having a plurality of parallel cutting tool fixing grooves to which a shank of a cutting tool can be fixed, and a tool holder that holds a tool for machining a workpiece gripped by a spindle that is capable of rotating about a spindle axis AX0. The tool holder includes a shaft part that is fixed to the cutting tool fixing groove, and a holding part. The holding part holds, as the tool that performs machining about a machining axis AX4, at least one of a rotary tool and a non-rotary tool in which the machining axis AX4 extends along the spindle axis AX0.