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When designing mechanical devices, the designer must consider what the allowable variation in size between mating parts can be.

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More Questions from Dimensioning

Dimension lines should not cross extension lines.
The drafter should always try to dimension to the profile view of an object when possible.
When extension lines or centerlines cross visible object lines, gaps should not be left in the lines.
Where the decimal-inch dimension is used, a zero is not used before the decimal point of values less than 1.
The inch is the commonly used unit for most metric engineering drawings.
It is more difficult to manufacture a part designed using two decimal places than the same part using four decimal places.
Longer dimension lines are nearest the object outline.
Avoid dimensioning to hidden lines.
Most mechanical drawings will include tolerance information in or near the drawing title block.
Typically, all dimension values and notes are lettered horizontally and should read from the bottom of the sheet.

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