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Types of Lines and Their Importance in Technical Drawing

📑 10 slides 👁 29 views 📅 1/31/2026
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Introduction to Technical Drawing Lines

Technical drawing relies on precise lines to communicate design intent.

Introduction to Technical Drawing Lines
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Continuous Thick Lines

  • Used for visible outlines and edges of objects.
  • Typically 0.5-0.7mm thick to stand out clearly.
  • Essential for defining the main shape of components.
Continuous Thick Lines
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Continuous Thin Lines

  • Applied for dimensions, extensions, and hatching.
  • Usually 0.18-0.25mm thick for secondary details.
  • Helps maintain drawing clarity without overwhelming.
Continuous Thin Lines
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Dashed Lines

  • Represent hidden edges and features not visible in view.
  • Dashes are typically 3-4mm long with 1mm gaps.
  • Critical for showing internal structures and assemblies.
Dashed Lines
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Chain Lines

  • Indicate center lines, symmetry, or pitch circles.
  • Alternate long and short dashes (10mm and 2mm).
  • Vital for alignment and rotational part features.
Chain Lines
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Zigzag Lines

  • Used for long breaks in uniform sections.
  • Saves space by shortening repetitive objects.
  • Common in shaft, rod, and piping drawings.
Zigzag Lines
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Phantom Lines

  • Show alternate positions or moving parts.
  • Composed of one long and two short dashes.
  • Important for demonstrating mechanisms in motion.
Phantom Lines
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Cutting Plane Lines

  • Indicate where sectional views are taken.
  • Thick lines with arrowheads showing direction.
  • Crucial for understanding internal geometries.
Cutting Plane Lines
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Stitch Lines

  • Represent sewing or stitching in product design.
  • Series of small dashes with consistent spacing.
  • Used extensively in fashion and upholstery drawings.
Stitch Lines
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Conclusion: Line Importance

  • Correct line usage conveys precise technical information.
  • Standardized line types enable global understanding.
  • Mastery of lines reduces errors and improves communication.
Conclusion: Line Importance
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