1. Purpose of Measuring and Testing

After each operation within the manufacturing process, workpieces must be checked for size, shape or surface finish, This is mostly based on the data of a manufacturing drawing. In addition to judgment by the eye, by the ear and tactile sense as possibilities of non-dimensional testing, dimensional testing methods using sensitive measuring and testing tools are predominantly applied in manufacturing processes.

Testing with measuring tools (measuring):

Lengths and angles of any object are determined (measured) by comparison with a measuring instrument where the exact value measured can be read on a scale.

Figure 1 Measuring

Testing with testing tools (gauging):

Deviations in size or shape of any object are determined (tested) by comparison with a gauge.

This will answer the question as to whether the deviations are within or beyond admissible ranges (tolerance ranges) only. There is no need to know the exact value.

Figure 2 Testing

Which testing methods do you know?

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What is the difference between measuring and gauging?

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