Specializing in Industrial Automation & Data Collection Since 1984

Inductive (Eddy Current) Sensor

eddyNCDT SGS4701

Micro-Epsilon SGS (Spindle Growth System) 4701 displacement measuring system was developed for Measuring the Thermal Expansion in Spindles

SKU: eddyNCDT SGS4701 Category:

The SGS4701 displacement measuring system (Spindle Growth System) is developed specifically for high speed milling machine applications. Due to high machining speeds and the heat generated, the linear thermal expansion of the spindle in precision machine tools needs to be compensated for in order to keep the tool in a defined position at all times. The SGS sensor measures the thermal and centrifugal force expansion of the spindle. These measurement values are fed into the CNC machine tool as correctional values, compensating for any positioning errors. The SGS4701 operates on the eddy current measuring principle. This non-contact measurement method is wear-free. Furthermore, the measurement procedure is resistant to disturbances such as heat, dust and oil.


  • Non-contact and wear-free measurement
  • Cost-effective design
  • Miniature sensor and controller, entirely integrable into spindle
  • Calibration for ferromagnetic and non-ferromagnetic
  • Integrated temperature measurement in the sensor
  • Extreme temperature stability