Many parts and instruments have specifications that call for a tolerance. That just means that there is a given range within which the part has acceptable quality.
One way to determine if the part is good is to measure and compare the results to the specification. This, however, is a slow process.
An alternative is to use a Go/No-Go Gauge. This tool requires a part to complete two tests. The part must fit one of the gauges the measures one extreme of the tolerance (i.e. “Go”), and must not fit the other extreme (i.e. “No-Go”).
This simple form of test is quick and generally accurate due to its simplicity.
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Go/No-Go gauges are valuable tools for your Lean toolkit due to the ease of which they can be used in a fast-paced environment. Taking measurements introduces a degree of variation into a process, which can be exaggerated when time is at a premium.
Go/No-Go gauges, on the other hand, generally have very few failure modes. These gauges can, in some cases, even be combined into a single step, as shown in this version known as a snap gauge.