Engineering Drawing
This is the total amount that the feature on the actual part is allowed to vary from what is specified by the dimension:

Allowance
Specification
Difference
Tolerance

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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?

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

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