![]() The bottom frame (FRTZF) refines the location and orientation of the holes only to the other holes.The Position symbol must span across the two frames.In summary, there are four Composite Feature Control Frame rules: All three datums would have to be called out in the bottom FCF, even though datum B would not be used. What if it was not necessary for the pattern to lock to datum B, but locking to datum C was required? For the bottom frame to match the top, datum C could not be placed under datum B. ![]() You can see that the datum callouts in the bottom frame align under the matching datum callouts in the top frame. The bottom frame locks the orientation of the pattern to datum A and the rotation of the pattern to datum And B. In the Figure 1 example, the top frame locks location and orientation of the pattern to datums A, B, and C. Meaning, for our example, the FRTZF refines the location and orientation of the holes only in relation to each other.Īnother characteristic of the Composite FCF is that the bottom frame must match the top frame. The bottom frame is the Feature Relating Tolerance Zone Framework (FRTZF), pronounced “fritz.” This framework refines the location and orientation of the pattern itself. It behaves the same as a normal position tolerance. The top frame is the Pattern Locating Tolerance Zone Framework (PLTZF), which is pronounced “plahtz.” The PLTZF locates the pattern to the datum reference frame and is going to be a more generous tolerance. Figure 1: Composite Position Feature Control Frame (Datum A is the back side of part)
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