Engineering Drawing
These are used to attach parts to a cylinder so they won't turn on it:

Lugs and bearings
Keys and key-ways/key-seats
Knurls and keys
Key-seats and bearings

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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 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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