OBJECTIVES OF METROLOGY
Although the basic objective of a
measurement is to provide therequired accuracy at a minimum cost, metrology has
further objectives ina modern engineering plant with different shapes which
evaluation of newly developed products.
Determination of the process
capabilities and ensure that these are better than the relevant component
of the measuring instrument capabilities andensure that they are quite
sufficient for their respective measurements.
the cost of inspection by effective and efficient use of available facilities.
Reducing the cost of rejects and rework
through application of Statistical Quality Control Techniques.
standardize the measuring methods
maintain the accuracies of measurement.
prepare designs for all gauges and special inspection fixtures.
Importance of Metrology
The importance of the science of
measurement as a tool for scientific research (by which accurate and reliable
information can be obtained) was emphasized by Ga1ileo and Gvethe. This is
essential for solving almost all technical problems in the field of engineering
in general, and in production engineering and experimental design in
particular. The design engineer should not only check his design from the point
of view of strength or economical production, but he should also keep in mind
how the dimensions specified can be checked or measured. Unfortunately, a
considerable amount of engineering work is still being executed without
realizing the importance of inspection and quality control for improving the
function of product and achieving the economical production.
Higher productivity and accuracy is called for by
the present manufacturing techniques. This cannot be achieved unless the
science of metrology is understood, introduced and applied in industries.
Improving the quality of production necessitates proportional improvement of
the measuring accuracy, and marking out of components before machining and the
in-process and post process control of the dimensional and geometrical
accuracies of the product. Proper gauges should be designed and used for rapid
and effective inspection. Also automation and automatic control, which are the
modem trends for future developments, are based on measurement. Means for
automatic gauging as well as for position and displacement measurement with
feedback control have to be provided.