Grid Encoders KGM
The contouring accuracy of machine tools is determined essentially by motional deviations of the machine/drive/control system. The development, acceptance testing, and regular inspection of machine tools require not only the measurement of positional deviation (e.g. with VM 182 comparator system from HEIDENHAIN, but also the measurement of contouring deviations — especially at high traversing speeds (dynamic accuracy). Circular interpolation and free-form tests make it possible to draw conclusions about both the condition of the machine and the parameter settings of the control and drives.

The new KGM 182 Grid Encoder can measure the dynamic accuracy of very small circles (i.e., with very high axis acceleration) as well as any curved path on a moving machine. It therefore provides information on the positional and contouring performance of the machine tool independently of machining influences.

The KGM 182 consists of a grid plate with a two-coordinate TITANID phase grating on glass (4 m signal period) embedded in a mounting base, and a non-contact scanning head (1 VPP signal levels). The mounting base is fixed to the machine table and the scanning head is locked into the spindle. The grid plate of the KGM 182 has a measuring range 230 mm in diameter. The system accuracy is 2 m.


   KGM 181 KGM 182
Measuring standard

Signal period
Coefficient of thermal expansion
Two-coordinate TITANID phase grating on glass
4 m in both directions
atherm= 8 ppm/K
Measuring range Dia. 140 mm Dia. 235 mm
Accuracy grade 2 m
Evaluation electronics* PC counter card IK 220
Evaluation software* ACCOM for AT-compatible PCs
Recommended measuring steps 1 m, 0.1 m, 0.01 m
* included in delivery



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