Problem:
2 concentric holes that need to maintain a minimum distance between their walls.
If the larger hole, which provides the reference datum, is at its maximum tolerance the smaller hole can be more off its ideal position - see large view in below image.
Which would be the correct...
Is it actually required to put a "THRU" or "THRU ALL" on a through-hole?
ASME Y14.5 (2009) specifies: "Where it is not clear that a hole goes through, the notation THRU follows a dimension."
Any other cut-out geometry is by default assumed to go all the way through a part body if no depth or...
As I understand it, a continuous feature is a feature interrupted by a gap or cut (as shown in figure 5-13 above), but not by a protrusion. At least that is what all the examples in ASME 14.5Y suggest.
Yes, they should be coplanar as if they were made as one surface.
It is somewhat a continuous feature situation, only that I don't think you can actually apply the continuous feature symbol here as it isn't really a feature created in one "cut".
ASME Y14.5-2009 has this for Two Coaxial Datum Features defining a Single Datum Axis:
Would it be OK to use this also with 2 sets of parallel planes like this:
If the min/max values of the envelope not matter due to deformation/waviness but the material thickness should be constrained then it may be a case where you want to invoke independence:
This defines the axis of the cylinder as the reference.
Placing the Datum on the surface of the cylinder instead on the diameter dimension would define the cylinder surface as the reference which really doesn't make much sense.
This image would be of a flat or rectangular part where it...
