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<p>[QUOTE=&quot;buyingtime777, post: 273271, member: 188&quot;]Go and No Go - When manufacturing a number of parts a machinist has a certain tolerance in measurement that is acceptable. Ideal measurement is marked on the blueprint and there are 2 more numbers with + and - beside them to indicate the smallest and largest measurements acceptable. Special tools or gauges can be employed to quickly test the part on the line rather then having to do measurements with calipers or micrometers. I usually have 2 such items lying nearby when I work for my Dad. He tells me go and no go. One should go and one shouldn&#039;t if the part is with in tolerance. Sometimes it may be a threaded item, sometimes they are small pins from a special set of precisely measured pins. Just depends on what you are making. Sometimes a machine is running badly and measurements are running all over the place and every part must be checked quickly.&nbsp; <a href="https://en.wikipedia.org/wiki/Go/no_go_gauge" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Go/no_go_gauge" rel="nofollow">https://en.wikipedia.org/wiki/Go/no_go_gauge</a>[/QUOTE]</p><p><br /></p>

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