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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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  • Disregard the concept of using Symmetry entirely. Symmetry is defined as a single PLANAR tolerance zone and cannot apply to multiple axis.

    Per your last post upper pic, (producing one datum definition of A-B of bores): If the two bores are twisted between each other (not parallel) it will entirely mess up the datum control. Hyphenation of a datum should only occur if the two datums are COAXIAL, this instance has only one axis in common between the two datums... so hyphenating them would be an erroneous GD&T definition.

    I think the best bet is to define each bore as A and B datums, then tolerance the 2x slots as you have with profile to [A] , as neil.challinor explained.
    Of course, don't forget to tolerance and/or basic and FCF the distance between the A and B datum cylinders.
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  • Disregard the concept of using Symmetry entirely. Symmetry is defined as a single PLANAR tolerance zone and cannot apply to multiple axis.

    Per your last post upper pic, (producing one datum definition of A-B of bores): If the two bores are twisted between each other (not parallel) it will entirely mess up the datum control. Hyphenation of a datum should only occur if the two datums are COAXIAL, this instance has only one axis in common between the two datums... so hyphenating them would be an erroneous GD&T definition.

    I think the best bet is to define each bore as A and B datums, then tolerance the 2x slots as you have with profile to [A] , as neil.challinor explained.
    Of course, don't forget to tolerance and/or basic and FCF the distance between the A and B datum cylinders.
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