Gear measurement - System DEXTERA

A sensor head follows the shape of tooth face and is inserted into each tooth-space during a rotation of the measured part. While the sensor head itself conducts a rotation movement, the moment is monitored in which the head touches both tooth face. This maximum, as recorded by an induction sensor, represents over-the balls diameter.

Measured parameters

  • Diameter over the balls(OBD)
  • Circularity (ovality) of the pitch circle
  • Run-out to the base surface (hole of wheel, bearing diameters of shaft, etc.)
  • Radius difference - Greatest radius difference of two neighboring teeth

All measures parameters fulfils all accuracy requirements Cg, Cgk ≥1,33 (e.g. during of common gearing measurement is ± 0,5 µm). Notice: They were measured also sorted precision gearings for balancing motor housings with total tolerance field of Mdk 6 µm. The measurement result is fairly independent of the user. A complete measurement cycle according to moduls and number of teeth is c. 30 seconds. The four most important characteristics for the process control are provided to the worker at the production machine, if the measuring station is deployed in the production.

This technology can be deployed as:

  • SPC-station, the measurement software is the enhanced by a statistic program (interface to qs-STAT standard
  • In-line-chain in the production line

Due to the high flexibility of this system it can be used even for smaller series is granted by a simple readjustment for different technological operations (hobbing, shaving, grinding).

Device readjustment for other gear type takes c. 2 minutes. Measuring station can measure also special gear types as synchronous gearing, inner and outer splines, screw gearing, worm gearing etc.

Technical parameters of system DEXTERA 

  • Accuracy of pitch diameter: ± 0,5 µm, Cgk - 1,67 in standard tolerances of automotive industry
  • Range: Pitch diameter 20 - 150 mm (basic version)
  • Measured module: 0,25 - 5 mm (basic version)

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