Composite profile using the same two datums.

The upper segment locates the overall profile to datums A & B.  The lower segment is the PLTZF (pattern locating tolerance zone framework - See ASME Y14.5 - 2018 sections 10.5 to 10.5.1.1 and fig 10.39).  PTLZF must always repeat the same datums in the same order as the upper segment but behave differently in that, they can only control orientation but must still fit within the upper segment's tolerance zone.

The easiest way to report this is to use the geometric tolerance command.

Composite callouts have been discussed many times before on this forum.  Here are a few links to previous posts...

 RE: Bolt Hole with composite TP 

 RE: Composite Tolerance 

 RE: GD&T Help_Sanity Check 

(or just type PLTZF or composite into the search bar like I did )

The upper segment locates the overall profile to datums A & B.  The lower segment is the PLTZF (pattern locating tolerance zone framework - See ASME Y14.5 - 2018 sections 10.5 to 10.5.1.1 and fig 10.39).  PTLZF must always repeat the same datums in the same order as the upper segment but behave differently in that, they can only control orientation but must still fit within the upper segment's tolerance zone.

The easiest way to report this is to use the geometric tolerance command.

Composite callouts have been discussed many times before on this forum.  Here are a few links to previous posts...

 RE: Bolt Hole with composite TP 

 RE: Composite Tolerance 

 RE: GD&T Help_Sanity Check 

(or just type PLTZF or composite into the search bar like I did )

Thanks Neil. Where can I read more about using profile in the Geometric Tolerancing command? I have trouble with it and likely because I don't understand it. For example, the profile of 0.5 of a surface to XYZ datums will show out of tolerance, but the location of the surface from those same datums will show it in at ±0.25. Why is that?

The help file has a lot of information.  It would probably be best for you to read the whole Geometric Tolerances section: https://docs.hexagonmi.com/pcdmis/2023.1/en/helpcenter/mergedProjects/core/geometric_tolerances/Using_Geometric_Tolerances.htm

These are the chapters dedicated to profile: 

https://docs.hexagonmi.com/pcdmis/2023.1/en/helpcenter/mergedProjects/core/geometric_tolerances/Profile_of_a_Line.htm

https://docs.hexagonmi.com/pcdmis/2023.1/en/helpcenter/mergedProjects/core/geometric_tolerances/Profile_of_a_Surface.htm

There could be many reasons why you get different results when comparing a geometric tolerance command to a location dimension but the most common causes are...

• Datum fitting - location commands and other legacy dimensioning methods are always relative to the active alignment.  The alignment may not match the datum reference frame or may not be capable of constraining the part in the same way.  For example, geometric tolerance datum reference frames under ASME Y14.5 are able to maintain the orientation and location relationships between the primary, secondary and tertiary whereas traditional alignments cannot.
• Math settings - legacy dimensioning takes the pre-resolved result from the (ACTL line of the feature) whereas geometric tolerance commands take the raw hits and re-calculate features & datums.  If the math is set to DEFAULT then it will use the calculation applicable to the GDT standard you have selected.  For example, DEFAULT datum math for ASME Y14.5 would be a constrained L2 fit.

Many people have found this document useful in explaining the differences to previous versions: Geometric Tolerance GD&T handout for PC-DMIS 2020R2 version (hexagonmi.com)

There is also a GDT training course available which can be delivered remotely or at a tech centre.  Contact your local Hexagon representative for details.

Thanks Neil. Much appreciated.