Calibration of a TG measuring system

How can one be sure that the measuring system measures correctly?

During the measurement of bulges, depressions and runout 2 methods
were established.

  1. Examination of the measuring system with a prepared tire
  2. Examination of the measuring system with an aluminum wheel

Prepared tire

A tire is provided with an artificial bulge. In addition in the intended measuring track a curved rubber surface is up-vulcanized.
Subsequently, with the measuring system one measures. The result is examined by the application of a mechanical dial gauge.

Aluminum wheel with defined runout as well as inserts of bulges and depressions


For RFP-4 and RFP-5 systems of SEICHTER GmbH in the meantime the wheel from aluminum is an accepted calibrating tool. It is manufactured after customer's request. For the bulges and depressions there are standardized inserts.


An aluminum wheel is designed in such a way that it can be installed into the rim holder of the measuring machine. The middle mounting hole of this aluminum wheel is for example arranged around 0.3 mm eccentrically. Thus a radial runout of 0.6 mm

Construction after customer's specification: calibrating tool from aluminum

On the upper side wall an insert is fastened with an artificial bulge. On the lower surface is an artificial depression.

Artificial bulge

Alu inserts bulge / depression

This arrangement is ideal both for capacitive sensors and for laser sensors of SEICHTER GmbH.

Aluminum wheel, capacitive sensor, bulge insert

The aluminum wheel can be calibrated and/or it is easily examinable with calibrated mechanical measuring systems.

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