Dimension lines should not cross extension lines.

More Questions from Dimensioning

• 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.
• A set of two mutually perpendicular datum planes is required for coordinate dimensioning.

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