A linear friction welding machine having a two-piece collet for holding a workpiece. The two-piece collet includes first and second halves that can be separated for loading the workpiece in a transverse direction, and brought together about the workpiece and locked in place to both secure the workpiece against axial movement as well as support the workpiece against transverse loads.

A linear friction welding machine having a two-piece collet for holding a workpiece. The two-piece collet includes first and second halves that can be separated for loading the workpiece in a transverse direction, and brought together about the workpiece and locked in place to both secure the workpiece against axial movement as well as support the workpiece against transverse loads.

This invention relates to a maintaining device for mechanical pieces, comprising a slider-holder formed by a body and a head with a central bore in which a part of the piece to be maintained is placed, the piece to be maintained exceeding the head, the head comprising a conical area, the maintaining device having at least two sliders and an actuation element for the sliders, wherein the head comprises at least two lateral bores, one leading into the conical area and the other to the central bore, the sliders are placed in the lateral bores, the sliders being adjustable in the lateral bores, the sliders exceeding the conical area of the head, the actuation element of the sliders being arranged to move the sliders in the corresponding lateral bores along an axis perpendicular to a longitudinal axis of the central bore.

An adjustable chuck apparatus is provided with a torque limiting device; a torque transmitting mechanism; a chuck; a threaded fastener; a pin; a first positioning member including a threaded tunnel; a second positioning member including a threaded tunnel; a barbell shaped interconnection member including a first externally threaded section at one end and threadedly fastened in the threaded tunnel of the first positioning member, a second externally threaded section at the other end and threadedly fastened in the threaded tunnel of the second positioning member, a bar interconnected to the first externally threaded section and the second externally threaded section, and a hole element through the second externally threaded section; a truncated conic collet; and a cap. Each of different screw taps can be fastened by the apparatus by rotating a hand tool to adjust a distance between the first positioning member and the second positioning member.