Engineering Drawing
This means that a feature of a finished product contains the maximum amount of material permitted by the tolerance dimensions for that feature:

Maximum material condition
Machine mark indication
Maximum machined indication
Machined material condition

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Engineering Drawing
How can the drafter prevent Auto-CAD from placing or stacking another center mark on a circle when adding a diameter dimension to it?

It can't be done
Explode the dimension and then erase the center mark
Use the trim tool to take away the stacked center mark
Use the Properties dialog box to turn off the center mark of the dimension

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