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GD&T question - Position of that slot

pab39
Hey,

I have to help some engineer for his drawings, and i wonder about something.
Here it is:

Admitting i have that part (picture), and the important thing on it is that the slot has to be well centered related to the Ø15 hole.
As the slot is already dimensionned with profile on the drawing, my fist idea would be to add A reference on the hole, and add A datum into the Profile (picture2)
But would this work ? and is this OK related to ASME ?

Someone proposed to add symetry to locate the slot (pisture3) but i guess this does the exact same thing. and btw, is it possible to dimension symetry related to an axis ?

How would you dimension that ?
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  • Hm OK, i'm not on the machine to try all of that, but i see.
    Anyway the bores should not necessary be aligned, the important thing is that each slot is aligned to its bore.

    So we finally toleranced the drawing like this:



    That should do the job. Sure the slot dimensions are basic and their position on the remaining axis are constrained (linear dimensions).
    Thanks for your help guys.
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  • Hm OK, i'm not on the machine to try all of that, but i see.
    Anyway the bores should not necessary be aligned, the important thing is that each slot is aligned to its bore.

    So we finally toleranced the drawing like this:



    That should do the job. Sure the slot dimensions are basic and their position on the remaining axis are constrained (linear dimensions).
    Thanks for your help guys.
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