The PTB (Physikalisch- -Technische Bundesantalt) is able to measure (calibrate) master gears for industry traceable to
national gear standards and in compliance with the Intemational System of Units (SI).
For thispurpose primary gear standards and standard measuring devices for the reference values Fa, Fp, Fp (total profile
deviation, total helix deviation, total cumulative pitch deviation) being available.
To calibrate tbe master gears of industry, PTB mostly uses coordinate measuring machines (CMMs) which are traceable
by instrument- -specific calibration methods. In addition, with the aid of the PTB’s primary standards, a task specific
uncertainty of measurement is determined for all gearing calibrations carried out for industry, which is taken into account
as correction value when the transfer measurement uncertainty is stated.

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