When would you use a true position callout on a hole feature?

When would you use a true position callout on a hole feature?

• A. When you want to ignore datums.
• B. When manufacturing wants looser tolerances.
• C. When the hole's axis must be located precisely relative to datums for proper fit/assembly.
• D. When the hole is not critical to assembly.

Answer: (C)

True position is used when the exact location of a hole’s axis matters for assembly. It defines a cylindrical tolerance zone around the specified position that is tied to datum references, so the hole’s axis must sit within that zone relative to the datums. This guarantees the hole lines up with mating features (like pins, dowels, or bolts) and that parts assemble consistently. If the hole’s location relative to datums isn’t controlled, alignment and fit can be off, which is why the callout is chosen specifically to ensure precise axis location for proper fit and assembly.

True position is used when the exact location of a hole’s axis matters for assembly. It defines a cylindrical tolerance zone around the specified position that is tied to datum references, so the hole’s axis must sit within that zone relative to the datums. This guarantees the hole lines up with mating features (like pins, dowels, or bolts) and that parts assemble consistently. If the hole’s location relative to datums isn’t controlled, alignment and fit can be off, which is why the callout is chosen specifically to ensure precise axis location for proper fit and assembly.