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.

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.

A Quick-Change Tool Holder (QCTH) centerline-position adjustment device is provided herein which is characterized by a device which provides for a plurality of distinct and variable position settings to be selected individually. The individual settings are selected by rotation of an indexable ring which contains a plurality of set screws which can be individually adjusted. The rotation of the indexable ring is about the central shaft which is mounted to the Quick Change Tool Holder.

A method and apparatus for center height alignment of a boring bar is disclosed. The apparatus includes a seat member with a bottom and a back, and a digital angle gauge mounted to the seat member. The method includes the steps of: assembling an apparatus comprising a seat member and a digital angle gauge; calibrating the apparatus such that a Display of the digital angle gauge reads zero degrees; and aligning the center height of the boring bar by rotating the boring bar such that the Display of the digital angle gauge reads zero degrees when the apparatus is mounted onto the boring bar.

A height-setting tool is provided that includes a first clamping jaw, a second clamping jaw, an adjustment member, and an indicator member. The first clamping jaw includes a first clamping surface. The second clamping jaw is opposed to the first clamping jaw, and includes a second clamping surface. The first and second clamping jaws are configured to grasp a jaw of a chuck. The adjustment member is coupled to the first clamping jaw and second clamping jaw, and is configured such that a movement of the adjustment member moves the first and second clamping jaws by corresponding amounts in opposite directions. The indicator member includes an indicator surface. The indicator member is coupled to the adjustment member with the indicator surface equidistant from the first and second surfaces along a clamping direction.

A height-setting tool is provided that includes a first clamping jaw, a second clamping jaw, an adjustment member, and an indicator member. The first clamping jaw includes a first clamping surface. The second clamping jaw is opposed to the first clamping jaw, and includes a second clamping surface. The first and second clamping jaws are configured to grasp a jaw of a chuck. The adjustment member is coupled to the first clamping jaw and second clamping jaw, and is configured such that a movement of the adjustment member moves the first and second clamping jaws by corresponding amounts in opposite directions. The indicator member includes an indicator surface. The indicator member is coupled to the adjustment member with the indicator surface equidistant from the first and second surfaces along a clamping direction.

A method and apparatus for center height alignment of a boring bar is disclosed. The apparatus includes a seat member with a bottom and a back, and a digital angle gauge mounted to the seat member. The method includes the steps of: assembling an apparatus comprising a seat member and a digital angle gauge; calibrating the apparatus such that a Display of the digital angle gauge reads zero degrees; and aligning the center height of the boring bar by rotating the boring bar such that the Display of the digital angle gauge reads zero degrees when the apparatus is mounted onto the boring bar.