A position adjustment device for adjusting the height of an object to be supported includes: a fixed portion; a movable portion provided to be movable in the height direction relative to the fixed portion and supporting the object to be supported; an expanding and contracting portion coupled to the fixed portion and the movable portion and configured to expand and contract in the height direction; an adjustment mechanism configured to adjust the position of the movable portion in the height direction relative to the fixed portion; and a metal member fixed to the fixed portion and the movable portion.

Certain exemplary embodiments can provide a system comprising a machine tool, a centerable holder, and a drill. The machine tool comprises a spindle and a tool holder. The centerable holder is pointed at the spindle of the machine tool. The centerable holder defining a pair of horizontal adjusters and a pair of vertical adjusters.

A tool head has a longitudinal axis, forward and rearward ends, and top, bottom and peripheral surfaces. The peripheral surface has first and second side walls provided with respective first and second serrated portions, each of the first and second side walls being divided into spaced apart top and bottom side wall portions. The peripheral surface also has a stopper wall which faces in the rearward direction, extends transversely to the second side wall and is provided with a stopper serrated portion. A rear wall formed at the rearward end and connects the first and second side walls. The tool head also includes an insert retaining portion proximate the forward end, and a coupling portion which extends in the direction of the rearward end and includes vertically spaced apart top and bottom coupling arms separated by a coupling recess opening out to the rear wall.

An angle adjustment mechanism includes an angle adjustment block including first opposing side faces inclined relative to the direction along the rotation axis of the turret; first and second adjustment blocks having inclined faces that are brought into surface contact with respective first opposing side faces, and movable in a direction along the rotation axis; a depression formed in a tool holder, and accommodates the angle adjustment block with the first and second adjustment blocks; first and second adjusters that move the first and second adjustment blocks in a direction along the rotation axis of the turret; and a first positioning member conducting positioning between the turret and the tool holder, and a second positioning member conducting positioning between the turret and the angle adjustment block. This configuration provides a mechanism for attaching a tool holder to a turret which can easily conduct highly precise angle adjustment.

A clamping chuck for clamping tools having a tool shank includes a sleeve portion which is open at its free end, is preferably composed of electrically conductive material and forms a tool-holding fixture for frictionally locking fixing of the tool shank in a press fit by shrink-fitting. The sleeve portion, preferably over an entire axial length of the tool-holding fixture, includes an inner sleeve and an outer sleeve. The outer sleeve receives the inner sleeve in an operationally ready state, is joined thereto without play, and is preferably also composed of an electrically conductive material.

The described rotary cutting tool comprises a tool body extending along a rotational axis and a cutting insert comprising at least one cutting edge. The tool body is mounted in a mounting pocket delimited by two clamping fingers. A clamping finger bore is provided on each of the clamping fingers. The cutting insert also has a through bore. A holding element is arranged in the clamping finger bores and in the through bore to couple the cutting insert to the tool body. A section of the holding element located within the through bore is crowned. A holding element for such a rotary cutting tool is also presented.

A rotary cutting tool includes a tool shank, a replaceable cutting head mounted on the tool shank, a coupling pin, and an actuation member. In one embodiment, the coupling pin has a cylindrical portion with a reduced-diameter portion defined by a pair of angled side walls separated by a bottom surface for cooperating with a non-threaded portion at one end of the actuation member. In another embodiment, the coupling pin has a cylindrical portion with a notch with a pair of side walls for cooperating with a frustoconical member at one end of the actuation member. When assembled, a pair of V-shaped contact surfaces on the cutting head engage a pair of oppositely facing V-shaped contact surfaces on the tool shank to provide stability against the momentum created by cutting forces in two different directions and securely hold the cutting head in place during machining operations.

A hydro chuck includes a shank portion provided on one end side in a longitudinal direction and having, on a leading end side thereof, a cylindrical chuck portion for gripping a gripped object and an operational portion provided on the other end side in the longitudinal direction and disposed in continuation from the shank portion. The shank portion is fixable by being inserted to a tool mount included in a machine tool. The chuck portion includes a sleeve gripping the gripped object and a fluid pressure chamber formed on an outer circumference side of the sleeve and filled with fluid, the chuck portion being configured such that in association with a rise of a pressure of the fluid inside the fluid pressure chamber, the sleeve is reduced in its diameter to grip the gripped object. The operational portion includes a communication passage communicated to the fluid pressure chamber and a pressurizing piston disposed in the communication passage and adjusting the pressure of the fluid inside the fluid pressure chamber.

A laser alignment system is affixed to a drilling machine M, the laser alignment system contains: a base, two first fixers, two lamp holders, two second fixers, two first resilient elements, two first adjustable screws, two second resilient elements, and two second adjustable screws. The base includes two symmetrical holding sections, two extensions, and two peripheral orifices. Each first fixer has a first arcuate portion, an accommodation hole, a first threaded hole, a limitation hole, a first protrusion and a second protrusion. Each lamp holder includes a peripheral knob, a first receiving orifice, a first rotation portion, a second rotation portion, and a swing portion. Each second fixer includes a second arcuate portion, a second receiving orifice, a first projection and a second projection.

Certain exemplary embodiments can provide a system comprising a machine tool, a centerable holder, and a drill. The machine tool comprises a spindle and a tool holder. The centerable holder is pointed at the spindle of the machine tool. The centerable holder defining a pair of horizontal adjusters and a pair of vertical adjusters.