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Composite Position with separate requirement for pairs of features

Huddman

Student
Apr 12, 2025
1
Attached is a view of a base plate that will hold three brackets, each with 2 clearance holes for #8 Screws. I have a composite position control. I want to loosely get the pattern located within .125 cylindrical tolerance zones. I then need the Y direction spacing to be at the .750 basic hole to hole position with a tolerance of .014 diameter for the cylindrical zones, but only in the Y direction. I still want the individual pairs of holes to be able to float left to right, as 3 separate units of two holes and not as a pattern of 6 holes, within the .125 pattern locating tolerance zones. I also want the pairs of hole to have the .014 dia tolerance zones perpendicular to datum B so when the assembly is mounted on the wall, the brackets are not rotated too much about the Z axis. How do I convey that with what I have got so far, per the ASME Y14.5 2018 standard? Thanks in advance.
 

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    Composite Position.jpg
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What you are asking for is not a composite tolerance.

Use multiple single segment tolerances, one for each component of the position control you want and use "SEP REQ" as necessary to separate the various effects as required. Look for "Bidirectional Positional Tolerancing, Rectangular Coordinate Method"
 

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