What is FIM limits
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Re: What is FIM limits
Re: What is FIM limits -- eddyhtmok	Post Reply	Top of thread	Forum

Posted by: traingdt ® 09/15/2004, 13:20:45 Author Profile Mail author Edit

FIM stands for Full Indicator Movement, and it is essentially the same thing as Total Indicator Reading (TIR), which some people may already be familiar with. This means that as the part is rotated, a dial indicator can be held against the surface, and the total deviation (which includes both the plus and minus deviation) cannot exceed the given number. One caution: to rotate the part in this inspection, it should be clear as to what axis we are rotating around (the "datum," in technical terms). On many parts, different diameters may be designed to share a common axis, but any offset between these could significantly change the FIM readings. (This is why GD&T is recommended; in GD&T we could use the symbols for runout and clearly identify the datum). Hope that helps...

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