Instrumented tool post, and associated tool holder

A tool post of a machine tool suitable for receiving a cutting insert for machining of a workpiece, comprising:

• at least one sensor which determines a parameter representing a cutting action between a workpiece to be machined and a cutting insert;
• and
• a service case electrically connected to the sensor and including a battery and a printed circuit supplied with current by said battery, said printed circuit bearing, at least in part, a radio transmission unit and the case being formed from a bottom and from a cover which can be separated,
• wherein the battery is borne by the cover and the printed circuit by the bottom, or vice versa, and
• wherein the tool post further comprises a sealing joint inserted between the cover and the bottom to reinforce mechanical isolation between the battery and the printed circuit board.