[Ja...] Posted February 15, 2021 Share Posted February 15, 2021 Hi, I need help making sure that my understanding for this FCF is correct or not. [ True position | .005 TOTAL | -D- ] FCF is for a hole at a set distance .500 from plane -D-. I am thinking this mean in simple terms that tolerance on .500 is ± .005? Or does it mean tolerance is ±.0025 ? Which one is correct? Link to comment https://qualityforum.zeiss.com/topic/13506-true-position-gdt/ Share on other sites More sharing options...
[SH...] Posted February 15, 2021 Share Posted February 15, 2021 Please sign in to view this quote. Sounds like perpendicularly control and it should be plus or minus 0.025. Link to comment https://qualityforum.zeiss.com/topic/13506-true-position-gdt/#findComment-69160 Share on other sites More sharing options...
[Ja...] Posted February 15, 2021 Author Share Posted February 15, 2021 It's just distance control I think. Hole is parallel to the plane surface. Link to comment https://qualityforum.zeiss.com/topic/13506-true-position-gdt/#findComment-69162 Share on other sites More sharing options...
[Da...] Posted February 16, 2021 Share Posted February 16, 2021 Can I see drawing please ? Link to comment https://qualityforum.zeiss.com/topic/13506-true-position-gdt/#findComment-69164 Share on other sites More sharing options...
[To...] Posted February 16, 2021 Share Posted February 16, 2021 Please sign in to view this quote. Jayesh is on the right track. Without seeing the actual FCF, my opinion is the axis of the hole must lie within two parallel planes .005 apart, parallel to datum D, with center located exactly .500 from D. If the axis of the hole is perfectly parallel to D, then you would have the full ±.0025. On the other hand, if the parallelism of the full axis to D was .005, then your location from D would have to perfect. Link to comment https://qualityforum.zeiss.com/topic/13506-true-position-gdt/#findComment-69166 Share on other sites More sharing options...
[Ja...] Posted February 16, 2021 Author Share Posted February 16, 2021 Please sign in to view this quote. HERE IS THE FCF: Hole is not that deep just .100. so parallelism doesnt play a significant role in this. Link to comment https://qualityforum.zeiss.com/topic/13506-true-position-gdt/#findComment-69168 Share on other sites More sharing options...
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