It is always acceptable to dimension to a hidden feature.

More Questions from Dimensioning

• An external cylindrical shape is dimensioned where it appears circular.
• Tolerance issues are primarily a concern in manufacturing rather than in the design and drafting process.
• An extension line is a thin, dark, solid line that extends from a point on the drawing to which a dimension refers.
• When designing mechanical devices, the designer must consider what the allowable variation in size between mating parts can be.
• 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.

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