How do you identify workpiece reference points and systems of tolerance?

Answer:
Reference points: Think about how the part will be made, and how it will be inspected. Usually something will make sense. Try to keep common references between drawing views, and if possible try to base everything from points, planes, or edges that appear in multiple views.

Tolerances: Consider how the part will be made- what minimum tolerances can be held on the intended equipment and processes? What is the maximum tolerance on the individual parts that will allow the assembly to fit together and function properly? The right answers lie between those extremes.
First answer by ID2385478915. Last edit by Ebolton. Contributor trust: 39 [recommend contributor recommended]. Question popularity: 10 [recommend question].