[To...] Posted November 3, 2021 Share Posted November 3, 2021 Hello everyone. Looking for suggestions on best method to report position on the slot below. This one is throwing me off a bit due to basic slot length Datum Feature A is plane on bottom Datum Feature B is plane on right end Datum Feature C is plane, perpendicular to view. TIASlot Position.jpg Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/ Share on other sites More sharing options...
[Ro...] Posted November 3, 2021 Share Posted November 3, 2021 I would treat it the same as a slot with rectangular coordinates and report each axis separately to the same tolerances in the FCF. Normally there will be a separate callout for each axis, but since there isn't, it's a linear tolerance zone, and it's position and not profile, I don't think you have another choice. I guess you could report just the one direction that's shown and let the drawing notes/tolerances control the slot length and position. You'd either need a note with some sort of catch-all, like profile .xxx to A-B-C or something similar, or something like a general tolerance document that controls undimensioned features with a table of sizes and corresponding tolerances, similar to a hole chart. The slot length, even though it has a basic, has no tolerance directly applied to it, so it's kind of a judgement call on whether to use the FCF or some other controlling method. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58058 Share on other sites More sharing options...
[Ma...] Posted November 3, 2021 Share Posted November 3, 2021 True position controls controls only the location of the slot center. Slot width has a dimensional tolerance. Slot length is basic and is not controlled in snippet shown. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58060 Share on other sites More sharing options...
[To...] Posted November 3, 2021 Author Share Posted November 3, 2021 Please sign in to view this quote. I agree but then that brings up the question, "what is the tolerance on the length of the slot?" There are a few "questionable" gd&t concepts on this drawing.... including a note regarding ANSI Y14.5, which leads me to think this might be a drawing from the early days.... Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58062 Share on other sites More sharing options...
[Da...] Posted November 3, 2021 Share Posted November 3, 2021 I agree but then that brings up the question, "what is the tolerance on the length of the slot?" There are a few "questionable" gd&t concepts on this drawing.... including a note regarding ANSI Y14.5, which leads me to think this might be a drawing from the early days.... [/quote] That is odd. Normally there is a note or an all over profile to control basics. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58064 Share on other sites More sharing options...
[Cl...] Posted November 3, 2021 Share Posted November 3, 2021 Please sign in to view this quote. Would the .390 Basic default to the UOS Block tolerance? There are a few "questionable" gd&t concepts on this drawing.... including a note regarding ANSI Y14.5, which leads me to think this might be a drawing from the early days.... [/quote] That is odd. Normally there is a note or an all over profile to control basics. [/quote] Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58066 Share on other sites More sharing options...
[Da...] Posted November 3, 2021 Share Posted November 3, 2021 Please sign in to view this quote. That is odd. Normally there is a note or an all over profile to control basics. [/quote] [/quote] That is my understanding. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58068 Share on other sites More sharing options...
[Ro...] Posted November 3, 2021 Share Posted November 3, 2021 Please sign in to view this quote. Negative. A basic dimension has no tolerance and is a theoretical perfect nominal. Features defined by basic dimensions derive their tolerances from the FCF. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58070 Share on other sites More sharing options...
[Cl...] Posted November 4, 2021 Share Posted November 4, 2021 Please sign in to view this quote. That's embarrassing, I knew that and completely forgot. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58072 Share on other sites More sharing options...
[Da...] Posted November 4, 2021 Share Posted November 4, 2021 [img][/img] An "All Over" profile controls basic dimensions. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58074 Share on other sites More sharing options...
[To...] Posted November 4, 2021 Author Share Posted November 4, 2021 Please sign in to view this quote. There is no Profile callout on drawing. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58076 Share on other sites More sharing options...
[To...] Posted November 4, 2021 Author Share Posted November 4, 2021 Please sign in to view this quote. How would you deal with the MMC? Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58078 Share on other sites More sharing options...
[Ro...] Posted November 4, 2021 Share Posted November 4, 2021 Symmetry planes, symmetry points, or the old circle construction method to get the MMC. Maybe at a couple of depths, depending on the depth of the slot. Link to comment https://qualityforum.zeiss.com/topic/11686-position-of-slotagain/#findComment-58080 Share on other sites More sharing options...
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