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Blueprint Reading & Technical Drawing Interpretation Flashcards

7 cards from real CNC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Blueprint Reading & Technical Drawing Interpretation flashcards as text

  1. On a technical drawing, what does a hidden line (dashed line) represent?

    Answer: An edge or feature not visible from the current viewing direction

    Hidden lines are dashed and indicate edges or features that exist behind or inside the part as viewed from that projection direction.

  2. A GD&T feature control frame reads ⊙ | 0.005 | A | B. What does the ⊙ symbol indicate?

    Answer: Position

    The circle with a cross (⊙) is the GD&T symbol for Position, controlling the location of a feature relative to datums.

  3. What is the purpose of a revision block on an engineering drawing?

    Answer: To document changes made to the drawing after initial release

    The revision block tracks all engineering change orders (ECOs), recording the revision letter, description, date, and approver.

  4. In third-angle projection (used in the US), where is the right-side view placed relative to the front view?

    Answer: To the right of the front view

    In third-angle projection, the right-side view is placed to the right of the front view, matching the side from which you are looking.

  5. A drawing note specifies 'ALL FILLETS AND ROUNDS R.125 UNLESS OTHERWISE SPECIFIED.' What does this mean for a CNC machinist?

    Answer: All unspecified internal corners and external rounded edges are 0.125-inch radius

    This general note sets a default radius for all unspecified internal fillets and external rounds, saving space on the drawing.

  6. What does the term 'true profile' refer to in GD&T profile tolerances?

    Answer: The theoretically exact geometry of a surface as defined by basic dimensions

    True profile is the perfect theoretical geometry defined by basic (boxed) dimensions that the profile tolerance zone is centered on.

  7. On a CNC blueprint, a dimension shown as 1.500 ± 0.005 means the feature must be between what values?

    Answer: 1.495 and 1.505

    Adding and subtracting 0.005 from 1.500 gives a range of 1.495 (minimum) to 1.505 (maximum).