The invention relates to a machine comprising a first machining module (1) configured to simultaneously machine at least two crankshafts, a second machining module (2) configured to simultaneously machine at least two crankshafts, and a support structure (3) with at least four crankshaft fixing positions (31, 32, 33, 34) for the machining of such crankshafts. The support structure (3) is located between the machining modules. The fixing positions (31, 32, 33, 34) are arranged in two columns (35, 36) of fixing positions, each of which comprises at least two of the fixing positions (31, 32; 33, 34) located at a different height, and the support structure (3) is rotatably arranged, such that it can perform a rotation of at least 180 degrees.

A machine base for use in a machining system is provided. The machine base includes at least one work piece holder device receiving section having a work piece holder device interface, which includes an aligning device adapted for receiving the work piece holder device aligned on a z-axis. The machine base further includes at least one first machining unit receiving section provided with a first machining unit interface adapted for receiving a first machining unit including a first tool holder interface, and at least one second machining unit receiving section provided with a second machining unit interface adapted for receiving a second machining unit including a second tool holder interface. The first and second machining unit interfaces are arranged on opposing first and second sides of the work piece holder device interface and are movable at least along the x-axis or y-axis, respectively.

A computer-implemented method of planning of the shapes of free-form tool paths (P) for simultaneous two-sided machining of a dental restoration (1) having an individual free-form target geometry from a workpiece (2) by using a dental tool machine (3) having at least two tool spindles each having at least one tool (4) arranged on a different side of the workpiece (2) which is simultaneously movable along an axis (y) relative to the tools (4) thereby imposing a kinematic axis coupling. The method includes a step of determining transformations (T, T) of the target geometry by which the kinematic axis coupling is converted into a common coupling parameter for both tools (4); and a step of generating dependent on these transformations (T, T) the shapes of the free-form tool paths (P) in which the common coupling parameter is identical in time for all participating tool spindles that are driven simultaneously.

There is provided a guide dresser for milling a saw guide, the guide dresser comprising first and second cutter assemblies that are slidably mounted on a rail or slide system so as to be adjustable, in operation, between an open position and a closed position. There is also provided cutter heads and methods for milling a saw guide.