Position (on curved surfaces) in ISO and 2 other questions (CZ combined zone modifier related)

[Andera]

ISO GPS
1.) Can I, legally, use position for a curved surface in ISO? I suspect not, but I could if the surface is a planar surface (not curved. Am I correct?
2.) Is CZ (combined zone) usable with an orientation control (parallelism)?
3.) What would be the difference if CRZ is used (instead of CZ) with an orientation control (per #2)?

 

[greenimi]

My opinion:
1.) No, you cannot. Use profile on curved surfaces.
2.) Yes, it could. Aren't there any examples in ISO 1101, ISO 5458 to show the concept? Anyone can help with some applicable standard examples?
3.) Hmm, as I read on this forum CZ constrain location and orientation of the tolerance zone, but CRZ only constrain the orientation of the tolerance zone.

 

[TED7]

ISO 5458 has a couple of examples showing CZ used with flatness, position and symmetry and I've used it with parallelism a couple of times myself. I've not got any section references though.

 

[greenimi]

My silly question of the day:

Would be legal to show multiple feature control frames with CZ modifiers instead of a single geometric callout? The essence of my questions is about the grouping mechanism in ISO.
If 4 holes are dimensioned for size and location (with 4 individual positions callouts) can I use position with CZ (inside of FCF) or shall I use position with SIM (outside of the FCF)?
I suspect the correct way is the later.

Note: I am not using 4x……just to the sake of my own clarification.

What I do know, from previous discussions, is that CZ should be used for a group of features controlled by the same single geometric callout.
Also from a quote from ISO :” When a single indicator pattern specification is defined, each individual tolerance zone in the tolerance zone pattern has the same size and the same shape.“