[Ke...] Posted July 11, 2022 Share Posted July 11, 2022 I'm not too familiar with all of the ISO spec details. It has been asked whether an air gage is able to satisfy the Independency Principle Method requirement, or whether the measurement method must be a 2 point contact/diameter evaluation. Any insight is appreciated Thanks! Link to comment https://qualityforum.zeiss.com/topic/10040-independency-principle-method-iso_8015-%E2%80%93-2011/ Share on other sites More sharing options...
[Ri...] Posted July 11, 2022 Share Posted July 11, 2022 This is the biggest difference between ISO and ASME (imo). 8015 states that "All requirements on the drawing have to be fulfilled independently from each other. The size tolerance does not limit the form deviation." So if the Envelope requirement is not invoked, then only all the local sizes (2 point measurements) must lie between the the limits of size. Link to comment https://qualityforum.zeiss.com/topic/10040-independency-principle-method-iso_8015-%E2%80%93-2011/#findComment-47770 Share on other sites More sharing options...
[Da...] Posted July 11, 2022 Share Posted July 11, 2022 Please sign in to view this quote. Check ISO 14405-1:2016 paragraph 4 Specification modifiers and symbols and choose (modify) your destiny :) Link to comment https://qualityforum.zeiss.com/topic/10040-independency-principle-method-iso_8015-%E2%80%93-2011/#findComment-47772 Share on other sites More sharing options...
[Ke...] Posted July 11, 2022 Author Share Posted July 11, 2022 Please sign in to view this quote. Would you agree with this statement (Regarding the use of an air gage): "An air gage would satisfy neither the Envelope requirement, nor the independence principle (using local 2pt measurements), as an air gage would rovide as average result, which is most similar to a LSQ evaluation, using a CMM." Link to comment https://qualityforum.zeiss.com/topic/10040-independency-principle-method-iso_8015-%E2%80%93-2011/#findComment-47774 Share on other sites More sharing options...
[Ri...] Posted July 11, 2022 Share Posted July 11, 2022 Please sign in to view this quote. Assuming it is a 3 port or more, that would be a correct statement. Link to comment https://qualityforum.zeiss.com/topic/10040-independency-principle-method-iso_8015-%E2%80%93-2011/#findComment-47776 Share on other sites More sharing options...
[Da...] Posted July 11, 2022 Share Posted July 11, 2022 Please sign in to view this quote. Please sign in to view this quote. Those 2 are surely correct, 3rd one - I can't get my head around, but I'm not using them. You are talking about https://www.qualitymag.com/articles/88856-quality-101--all-about-air-gages of course? edit: thanks Richard Link to comment https://qualityforum.zeiss.com/topic/10040-independency-principle-method-iso_8015-%E2%80%93-2011/#findComment-47778 Share on other sites More sharing options...
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