Which dimensioning system requires all dimensions to be placed from a datum rather than feature to feature?

Which dimensioning system requires all dimensions to be placed from a datum rather than feature to feature?

• A. Datum Dimensioning
• B. Baseline Dimensioning
• C. Aligned Dimension
• D. Reference Dimension

Answer: (B)

Baseline dimensioning uses a single starting point, such as a datum line or reference surface, from which all other dimensions are measured. This means every measurement is taken from that common baseline rather than from one feature to another. The result is more predictable and consistent control of size and location, since tolerances don’t accumulate as you move from feature to feature. In contrast, datum-based approaches still relate features to datums, but not every dimension is forced to start from the same baseline. Aligned dimensions focus on the direction of measurement relative to feature orientation, not on a single baseline. Reference dimensions provide information only and don’t drive manufacturing tolerances.

Baseline dimensioning uses a single starting point, such as a datum line or reference surface, from which all other dimensions are measured. This means every measurement is taken from that common baseline rather than from one feature to another. The result is more predictable and consistent control of size and location, since tolerances don’t accumulate as you move from feature to feature.

In contrast, datum-based approaches still relate features to datums, but not every dimension is forced to start from the same baseline. Aligned dimensions focus on the direction of measurement relative to feature orientation, not on a single baseline. Reference dimensions provide information only and don’t drive manufacturing tolerances.