21
Absolute/Incremental
To get the most out of your DRO, you must understand the two types of dimensions
most commonly used in blueprints: Absolute (ABS) and Incremental (INCR).
Absolute dimensions are measured from a common reference point. In Illustration A,
below, the common reference or zero reference point is located on the lower left side of
the part. These absolute dimensions are frequently used in blueprints.
Incremental dimensions have no common reference point. In Illustration B, below,
each location is dimensioned in steps, or increments.
Sometimes, both absolute and incremental measurements are used in one drawing. In
illustration C, below, the first two holes are dimensioned incrementally and the third hole
is dimensioned from the absolute zero reference point. That is, it is dimensioned
absolutely.
A. Absolute Dimensioning
B. Incremental Dimensioning
C. Combination ABS – INCR Dimensioning
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