A rotary indexing machine that includes a machining device, that has at least two machining stations and at least one pre-turn station, which are arranged at least substantially on a shared circumference in respectively a circle segment, and a motor unit, that is provided to drive the pre-turn station. The motor unit is arranged at least largely within the circle segment of the pre-turn station.

A machine tool, in particular a multi-spindle and/or double-spindle milling machine, comprising a machine frame, a workpiece clamping device for clamping a workpiece, an axis slide assembly which is arranged on the machine frame and is configured to linearly move the workpiece clamped on the workpiece clamping device by way of two controllable linear axes in a Y-direction and a Z-direction, and a spindle carrier assembly, which is arranged on the machine frame and has at least two tool-carrying work spindles that can be moved independently of each other in an X-direction which is perpendicular to the Y-direction and Z-direction.

The present application concerns a holder system for mounting and aligning a machining unit (30) to a machine (20), preferably to a rotary transfer machine. The holder system comprises a holder (1) with a first part (2) being mountable on a machine (20) or being part of a machine (20) as well as a second part (3) which is releasably coupled to said first part (2) in a defined first position. Said second part (3) is coupled to a third part (4), said third part including third coupling means (7) for coupling said third part (4) with a machining unit (30). Positioning means (5, 6) are located between said second part (3) and said third part (4) to allow moving said third part (4) relative to said second part (3) in at least one spatial direction. Further, the holder system comprises at least one alignment station, said alignment station comprising first coupling means for releasably coupling the second part (3) of the holder (1) to said alignment station in said first defined position and at least one measuring device arranged on said alignment station, said measuring device configured to measure the position of said third part (4) or of a machining unit (30) coupled to said third part (4) relative to the second part (3).