1. Size dimensions show the size of a given figure, while location dimensions show where a particular feature is on a view.
2. Chain dimensioning means dimensioning with each dimension connected to another dimension. Datum dimensioning means dimesnioning from one common point.
3. In a dimesnioned drawing the concrete dimensions of a given part can be clearly communicated to thew person(s) in question whereas writing can be sometimes vague.
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Your CAD drawings look good, but you might be missing one drawing. You're missing the one with the loft technique.
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