Abstract: The invention refers to an apparatus for monitoring the operation of an electrically conductive tool (120) of a machine tool (100, 400) having at least one electrically conductive spindle (110) for holding the tool (120) and a detector (140, 545, 645) which determines an electrical resistance (190, 290, 390) between the spindle (110) and the electrically conductive work piece (130) to be processed, and wherein the spindle (110) is electrically isolated from the machine tool (100, 400) and/or the apparatus is adapted to electrically isolate the work piece (130) to be processed from the machine tool (100, 400).

Abstract: Apparatus for thread testing, comprising at least one plug gauge (6) for testing a thread (8), the plug gauge being adapted for connecting with a machine axis (2) of a machine tool (1) and a displacement sensor (12) connectable with the at least one plug gauge (6) and the machine axis (2) for determining a maximum path (23) which the plug gauge (6) may be screwed into thread (8).

Abstract: The invention refers to an apparatus for monitoring the operation of an electrically conductive tool (120) of a machine tool (100, 400) having at least one electrically conductive spindle (110) for holding the tool (120) and a detector (140, 545, 645) which determines an electrical resistance (190, 290, 390) between the spindle (110) and the electrically conductive work piece (130) to be processed, and wherein the spindle (110) is electrically isolated from the machine tool (100, 400) and/or the apparatus is adapted to electrically isolate the work piece (130) to be processed from the machine tool (100, 400).

Abstract: Apparatus for thread testing, comprising at least one plug gauge (6) for testing a thread (8), the plug gauge being adapted for connecting with a machine axis (2) of a machine tool (1) and a displacement sensor (12) connectable with the at least one plug gauge (6) and the machine axis (2) for determining a maximum path (23) which the plug gauge (6) may be screwed into thread (8).

Abstract: A sensor system for a machine tool with at least one sensor with at least one measurement instrument, which measures a physical quantity occurring within the machine tool, which is related to a machining process performed by the machine tool; with a first energy supply for supply of the at least one measurement instrument of the sensor, wherein the first energy supply receives electric energy from a surrounding electromagnetic field in a wireless way; and with a second energy supply for supplying the at least one measurement instrument of the sensor, wherein the second energy supply comprises at least one battery.

Abstract: The invention relates to a sensor system for a machine tool with at least one sensor (100) with at least one measurement instrument (103), which measures a physical quantity occurring within the machine tool, which is related to a machining process performed by the machine tool; with a first energy supply unit (105) for supply of the at least one measurement instrument (103) of the sensor (100), wherein the first energy supply unit (105) receives electric energy from a surrounding electromagnetic field in a wireless way; and with a second energy supply unit for supplying the at least one measurement instrument (103) of the sensor (100), wherein the second energy supply unit comprises at least one battery (102).

Abstract: The present invention relates to a sensor system for a cutting machine tool (300) with an energy supply unit (101), which inductively provides energy for the supply of at least one sensor arrangement (110) of the cutting machine tool (300) out of a magnetic alternating field (B), at least one sensor arrangement which measures a force, appearing within the cutting machine tool (300) and/or a torque and/or the body sound within the cutting machine tool, and a data transmitting unit (120), which wirelessly transmits data, which relate to a value, which is measured by the at least one sensor arrangement (110) of the cutting machine tool (300).

Abstract: The present invention relates to a sensor system for a cutting machine tool (300) with an energy supply unit (101), which inductively provides energy for the supply of at least one sensor arrangement (110) of the cutting machine tool (300) out of a magnetic alternating field (B), at least one sensor arrangement which measures a force, appearing within the cutting machine tool (300) and/or a torque and/or the body sound within the cutting machine tool, and a data transmitting unit (120), which wirelessly transmits data, which relate to a value, which is measured by the at least one sensor arrangement (110) of the cutting machine tool (300).