Abstract: A thermal displacement correcting apparatus suitable for a machine tool (1) provided with a mechanism for feeding a main spindle (2) is disclosed.

Abstract: A mechanism for detachably mounting any selected one of several attachments to a hollow spindlehead ram within which a spindle is rotatably supported by a hollow shaft, the latter being capable of both rotary and axial displacement relative to the ram. Both the hollow shaft and the selected attachment are coupled with the ram via Curvic coupling teeth. Further, in order to retain the attachment in positive engagement with the ram via the Curvic coupling teeth, a series of external locking teeth are formed on the hollow shaft at constant circumferential spacings for engagement with a series of internal locking teeth formed on the attachment. The hollow shaft forces the attachment against the ram via the interengaged locking teeth under hydraulic pressure.

Abstract: An automatic tool exchanging apparatus of a machine tool comprises a machine body, a tool storage magazine, a spindle attached to the machine body, a tool conveying mechanism and a tool exchanging mechanism which are located between the tool storage magazine and the spindle for exchanging a tool in the magazine with a tool in the spindle, and a drive unit for driving the tool exchanging and tool conveying mechanisms. The tool conveying mechanism comprises a guide bar horizontally arranged between a predetermined position of the tool storage magazine and an intermediate tool pot of the tool exchanging mechanism, a tool carriage movably supported by the guide bar, a tool carriage reciprocating mechanism, a tool conveying arm member rotatably supported by the tool carriage and provided with clamp arms to clamp a tool, a tool conveying arm member rotating mechanism, and a tool conveying arm member reciprocating mechanism.