Explain ordinate dimensioning and zero coordinates.
What will be an ideal response?
Ordinate dimensioning is a type of rectangular datum dimensioning. In ordinate dimensioning, the dimensions are measured from two or three mutually related datum planes. The datum planes are indicated as zero coordinates. Dimensions from the zero coordinates are represented on drawings as extension lines, without the use of dimension lines or arrowheads.
Specific features are located by the intersection of datum dimensions. Ordinate dimensioning is used when there would otherwise be a large number of dimensions and features and close tolerances are required. Datums and ordinate dimensioning are the foundation of numerically controlled machine drawings and precision parts.
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What will be an ideal response?
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