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True position of... length?

Erikir
I have a round slot, 17 mm from edge of radius to edge of radius and 4mm wide.

My drawing says
17 +/- 0.3
|TP|0.5 MMC |A|B|C| (length)
Boundary

4+/- 0.3
|TP|0.2 MMC |A|B|C| (width)
Boundary

How do I report that?
Parents
  • This way you are only reporting center point of the slot. What "Boundary" part is trying to cover is rotation of the oblong slot around its axis.
    Lets say this slot is located at nominal, but rotated 45 deg. about center. You would show good results on report, but you wouldn't be able to assemble it to mating part.
    I used to report both ends of the slot as circle for both TP's, so 4 dimensions total. Or you could report inside boundary profile of the surface (which is harder to explain to your costumer)
    Inside boundary of this slot is 17mm-0.3mm-0.5mm=16.2mm X 4mm-0.3mm-0.2mm=3.5mm and it may not be violated by the surface of the slot

    From Tec-Ease BOUNDARY

    I face this same kind of problem ALL THE TIME! Engineers wanting true position of a distance. I finally got one of them convinced to use a profile call out. Quite frustrating when the only thing you can do given that kind of call in a FCF is to report position of a midpoint. Not what they want at all.
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  • This way you are only reporting center point of the slot. What "Boundary" part is trying to cover is rotation of the oblong slot around its axis.
    Lets say this slot is located at nominal, but rotated 45 deg. about center. You would show good results on report, but you wouldn't be able to assemble it to mating part.
    I used to report both ends of the slot as circle for both TP's, so 4 dimensions total. Or you could report inside boundary profile of the surface (which is harder to explain to your costumer)
    Inside boundary of this slot is 17mm-0.3mm-0.5mm=16.2mm X 4mm-0.3mm-0.2mm=3.5mm and it may not be violated by the surface of the slot

    From Tec-Ease BOUNDARY

    I face this same kind of problem ALL THE TIME! Engineers wanting true position of a distance. I finally got one of them convinced to use a profile call out. Quite frustrating when the only thing you can do given that kind of call in a FCF is to report position of a midpoint. Not what they want at all.
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