Quote:
Originally Posted by David in San Antonio
Newbie here - Okay, so the Go-No Go feeler has a smaller gauge section near the tip. How does this help?
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A go/no-go gauge is a feeler gauge with a portion at the tip which is thinner in both dimensions – less wide but also less thick. When inserted into the gap you want to measure, the gauge should stop right at the transition between the thinner and thicker sections, which is visible to you as the point where it gets wider.
If the gauge stops there, you know that the gap distance is larger than the thin part but smaller than the thick part. If it goes all the way in, you know the gap is larger than the thick part, and if it doesn't go in at all, you know the gap is smaller than the thin part.
The idea is that most clearances have a certain tolerance, e.g., .013-.015". A go/no-go gauge lets you quickly confirm that the clearance is somewhere within the tolerance without taking time to unnecessarily measure the clearance precisely.