Definition of Datum (Reference Datum)
Datum, also known as Reference Datum, is a theoretical vertical plane or line established by the manufacturer, from which all measurements of an object’s arm are taken. This reference point serves as the baseline for all other measurements, and any deviation or change from it is recorded and analyzed in relation to the datum.
The use of a datum allows for consistency and accuracy in the measurement of an object’s arm, including the determination of its center of gravity (CG) range. By measuring all moment arms and CG locations from this reference point, it provides a standardized and uniform method of measuring and comparing arm dimensions and characteristics, making it a fundamental concept in the field of engineering and design.
The datum can be selected based on various factors, such as the physical features of the object or specific requirements of a project. Once a datum is selected, it is critical to maintain consistency in all subsequent measurements and to clearly communicate the reference point used to avoid any misinterpretation.
In summary, Datum is a reference point used as the baseline for all measurements of arm, including CG range, established by the manufacturer and selected based on specific requirements or physical features. It provides a standardized and uniform method of measuring and comparing arm dimensions and characteristics.
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