[Cl...] Posted July 15, 2020 Share Posted July 15, 2020 Do you agree with this datum order of precedence? See the ellipse at the top left side of the part? The print calls out a .006 surface profile back to -A- & -B-. -A- is that left plane, -B- is the 3d line from two OD circles. Do you agree with the order of precedence? Link to comment https://qualityforum.zeiss.com/topic/15204-datum-order-of-precedence/ Share on other sites More sharing options...
[Me...] Posted July 15, 2020 Share Posted July 15, 2020 Not knowing the design intent I would opt for B as Primary and A as Secondary to avoid any projection error of the end face down the length of the axis. Link to comment https://qualityforum.zeiss.com/topic/15204-datum-order-of-precedence/#findComment-81800 Share on other sites More sharing options...
[Cl...] Posted July 15, 2020 Author Share Posted July 15, 2020 As far as "design intent" All I know is that a tube gets welded over the ellipse. I would agree with your assessment, thanks. Link to comment https://qualityforum.zeiss.com/topic/15204-datum-order-of-precedence/#findComment-81802 Share on other sites More sharing options...
[Da...] Posted July 16, 2020 Share Posted July 16, 2020 I'm going to take a guess at intent. Translation along -A- takes precedence over rotation around -B-. Link to comment https://qualityforum.zeiss.com/topic/15204-datum-order-of-precedence/#findComment-81804 Share on other sites More sharing options...
[Cl...] Posted July 16, 2020 Author Share Posted July 16, 2020 We are waiting to hear back from the customer on their rationale for the datum precedence. Link to comment https://qualityforum.zeiss.com/topic/15204-datum-order-of-precedence/#findComment-81806 Share on other sites More sharing options...
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