F679certification

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F679assessment

Hi, I am a beginner machinist so please be patient. I am machining a shaft for an existing bearing. I am having trouble figuring out which fit/tolerance to use. I understand that in the design process fit/tolerance is specified before the part is made which informs the machinist the allowable error in the final measurement for both parts to still achieve the desired fit. However I do not understand how to apply the ISO 286-2 chart to create a shaft for a already made hole.

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To make it more concrete, my bearing interanal diameter is 9.020mm measured by a micrometer. This is for a high-rpm application so the fit must be tight, however still be able to be put on by hand. Based on this information, how would I choose the allowable tolerance for the OD of my shaft using the ISO chart?

Deflection Gauges (mandrels) are used to test flexible sewer pipe for out-of-roundness or deflection per ASTM specifications D3034 and F679. This testing ensures that flexible pipe has been properly bedded and backfilled (ASTM D2321) to give optimal performance. Other gauges can get hung up – causing a deflection test to fail, even though the pipe is within tolerance. Sized to .02", steel deflection gauge styles meet ASTM requirements. Cherne Industries is a global leader in pipe plugs and testing.