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Let's say I have a thin plate with a hole in it: I'd like to control the position of the hole relative to the midplane of the part. Is a single datum as shown sufficient, or should I also have a datum on the large surface perpendicular to the hole? If so, is it necessary to qualify Datum A...

I'm not concerned by min. wall thickness or strength of the part; the 1.0 dimension has a functional requirement as it defines the fit of the part in an assembly. The horizontal location is not particularly important so is controlled by the loose general tolerances. Wouldn't a gauge require...

Thanks Garland23, that makes a lot of sense

Where should the position callout go? Do I need to state that datum C is perpendicular to datum B? And if I reference datum B in the FCF, does the position tolerance then control the distance from datum B (which I don't want to do)?

I have a 2D (die cut) part, where I'd like to dimension the distance between a hole and a curved edge. The measurement needs to be taken parallel to the long straight edges of the part; if it's measured at an angle the nominal would change. Is the measurement orientation implied already? How do...

Thanks Burunduk. Why is profile of a surface preferred? I have used flatness with CZ before and found it causes some confusion even for the guys familiar with GD&T in our vendor's inspection department. Would it be acceptable to add 'FLUSH' somewhere around the FCF to help them out? Is there a...

What's the best way to apply a 'flushness' tolerance to two nominally coincident surfaces? Is there a good way of doing so without needing to specify a datum?

Thanks Burunduk, very useful. So using positional tolerance in ASME, would that be a composite frame, with the upper frame locating the pattern with |⌖|⌀0.025|Y|, and the lower frame relating the holes to each other with |⌖|⌀0.075|Y|? Do you think this would be preferred to using...

Thanks for all the replies, I understand now: it is the datum feature simulator used to locate the other features, and by definition the simulator is perpendicular to datum A. If using a CMM rather than a gauge, presumably the CMM will create a the largest possible cylinder that is...

In this example, axis C is a tertiary datum for several other features, locating them in the left-right direction. If axis C is not perfectly perpendicular to datums A & B, this seems to create an ambiguous datum. Each end of axis C could be at a slightly different left-right position. How would...

Here's a simplified image. Part A in grey, part B in blue. Datum Y is the centre plane of part A.

I have a grey part (A) with two concentric holes, that form a hinge along with a blue mating part (B) and two pins: I want to ensure that part B will be aligned with datum Y on part A once assembled, so need an axis between the two holes in A to be perpendicular to datum Y. I can think of two...