What is a datum target and when is it used?

What is a datum target and when is it used?

• A. A datum target is a defined point/area used to establish a datum when a usable surface or edge is not available.
• B. A datum target is a standard surface used as a datum without any reference.
• C. A datum target is a measurement instrument for inspection.
• D. A datum target is a fixed feature that always remains stationary.

Answer: (A)

A datum target is a defined point or area on a part used to establish a datum when a usable surface or edge isn’t available for direct contact. It’s used to realize the datum in situations where curved, recessed, or otherwise noncontact-friendly features can’t provide a stable datum surface. The target is specified on the drawing with its location and size so measuring equipment can locate and use it to define the datum frame. It isn’t a measurement instrument, nor a fixed feature that inherently stays in place; it’s a designated feature on the part that enables a repeatable datum realization through measurement or contact.

A datum target is a defined point or area on a part used to establish a datum when a usable surface or edge isn’t available for direct contact. It’s used to realize the datum in situations where curved, recessed, or otherwise noncontact-friendly features can’t provide a stable datum surface. The target is specified on the drawing with its location and size so measuring equipment can locate and use it to define the datum frame. It isn’t a measurement instrument, nor a fixed feature that inherently stays in place; it’s a designated feature on the part that enables a repeatable datum realization through measurement or contact.