Gauge, Go/No-go  

go/no-go gauge refers to an inspection tool used to check a workpiece against its allowed tolerances via a go/no-go test. Its name is derived from two tests: the check involves the workpiece having to pass one test (go) and fail the other (no-go).

A go/no-go gauge is an integral part of the quality process that is used in the manufacturing industry to ensure interchangeability of parts between processes or even between different manufacturers. It does not return a size or actual measurement in the conventional sense, but instead returns a state, which is either acceptable (the part is within tolerance and may be used) or unacceptable (the part must be rejected).

These gauges are well suited for use in factory production as they require little skill or interpretation to use effectively and have few, if any, moving parts to be damaged in the often-hostile production environment.

The lower image is a plain plug gauge used to check the size of a hole: the green end is the “go”, and the red end is the “no-go”. The tolerance of the part this gauge checks is 0.30 mm, where the lower size of the hole is 12.60 mm and the upper size is 12.90 mm, every size outside this range is out of tolerance.

Gauge, Go/No-go   - image1Once the concept is understood, the principle of operation can lead to designs where internal grooves, keyways, splines, etc. may be measured in a simple yet effective manner. These will often be made to order by the toolmakers, or a related skilled tradesman.

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