|Measuring and Testing - Course: Technique for Manual Working of Materials. Trainees' Handbook of Lessons|
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.
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.
Which testing methods do you know?
What is the difference between measuring and gauging?