BlueprintExercises

Mechanical prints

Machining drawings pack a lot into a few characters: symbols, tolerances, fits, threads and finishes. Learn to read each one here. Pick ASME for US prints or ISO for European prints in any exercise.

7 lessonsPractice testASME ยท ISOCertificate with Pro

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0 of 8 doneStart lesson 1
  1. 1

    Dimension symbols

    Diameter, radius, square, reference and basic dimensions, counterbore, countersink and depth.

  2. 2

    Tolerances and limits

    Bilateral, unilateral and limit dimensions. Largest size, smallest size and total tolerance.

  3. 3

    Limits and fits

    Clearance, transition and interference fits. ISO hole and shaft codes like H7/g6.

  4. 4

    Thread callouts

    Read 1/4-20 UNC-2A and M10x1.5-6H: size, pitch, series and internal or external.

  5. 5

    Surface finish symbols

    The check mark, the bar and the circle, roughness values and lay symbols.

  6. 6

    Work out the limitsHarder

    Largest size, smallest size and total tolerance, typed to the last decimal place.

  7. 7

    Read a part drawingHarder

    A full part print with views, holes, tolerances, a feature control frame and a title block. Five questions per drawing.

  8. Practice test20 questions

    Mixed questions from every lesson. Use it to check what you know.

Reference