normal - Jenoptik AG

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such as the cam shape, angle, diameter, roundness and straightness.
The PTB calculated the measurement results, determined
the associated measurement uncertainty, and then issued a
certificate for the cam standard.
Higher precision for the automobile industry.
One cam standard was fabricated for Jenoptik as part of the
research project, while a second is kept by PTB in Braunschweig.
Customers from the automobile industry will be able to choose
between two certificates for their cam standard: either one
certified by the PTB or one provided by Jenoptik and certified by
the German Accreditation Agency (DAkkS). Currently, the first
“DAkkS Cam Shape Laboratory” is being installed at the Jenoptik
Industrial Metrology division in Villingen-Schwenningen, which
can be used to certify the cam standard with “slightly higher
permissible measurement deviation than with the PTB,” as Reiner
The cam standard certified by the PTB serves as an
original metric by means of which all measurement
results from shaft meters can be compared.
Emminger says, explaining the difference. The DAkkS certificate
does suffice for most customers, however.
The camshaft research project was started with the PTB and automobile
supplier Mahle about five years ago. “We had already
worked with the PTB before, for example with standardization
and guidelines for accreditation. And in 2002 we worked together
to develop the KN8 contour standard.” Mahle was involved
as the industrial partner for the cam standard because they had
already used different camshaft measuring machines from the
Jenoptik division in measurement chambers and in final inspections,
and showed great interest in the traceability of assessments.
The team lead in Mahle product development in Stuttgart
confirmed how important this PTB-certified cam standard is:
“Just for its traceability and comparability, the new cam standard
is much more reliable for measurements, and that improves our
quality in all of our production facilities.”
Additional certificate for metrology software.
To be able to measure and evaluate shape and orientation characteristics
of camshafts adequately, special evaluation strategies
and algorithms are required. “These have never been integrated
into the system testing of cam shape measurement machines
because no standardization of the evaluation procedure existed,”
explains Reiner Emminger. There are often error sources hidden
in the evaluation of such complex datasets, for example due