BRX210

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BRX210 Mechanical Blueprint Reading

• Unit 1
• Drawings and Prints

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After studying this unit, you will be able to

• Explain the difference between drawings and
  prints
• Explain the advantages of CAD drawings
• Describe print making processes
• Handle prints correctly

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Drawings

• Two types
• 1. Machine drawings
• Used to produce one unique part
• 2. Assembly drawings
• Used to show how different parts are connected

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Hand Drafting

• Creation of drawings using pencils, triangles,
  straightedges, and other drafting tools
• It is a very time consuming process
• Few drawings are created this way today

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Computer-Aided Drafting (CAD)

• Created using computer software
• Several components of a CAD system
• CPU (Central Processing Unit)
• Main body of the computer
• Where the information is stored and processed
• Monitor
• Screen used to view the drawing
• Keyboard
• Used to input text and numbers

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• Digitizer (Mouse)
• Input device used to control an on-screen cursor
• Plotter
• Used to create the actual physical drawing on
  paper
• Modem
• Used to transfer information between computers
  anywhere in the world

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CAD Advantages

• Increased productivity
• More accurate drawings
• Easier drawing storage
• Easier drawing management

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Prints

• A print is a copy of a drawing
• Prints can be made quicker and more affordable
  than plotted drawings
• Often, the term blueprint is used instead of
  print
• Blueprint older method with dark blue
  background and white lines and symbols
• Two methods of creating prints
• Photocopying
• Diazo process

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Engineering Copies

• Use an electrostatic process to reproduce
  drawings
• Similar to common copier machines
• Designed to handle larger size drawings

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Diazo Process

• Still used today though slowly being replaced by
  the faster engineering copiers
• Diazo process is a photochemical process using
  light and chemicals (ammonia) to produce drawings
• Often referred to as bluelines due to blue
  lines on white background
• Always exact duplicates of the original and much
  sharper than engineering copies

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Care of Drawings and Prints

• Original drawings should be stored in a safe
  place
• Protect from
• Water
• Weather
• Oil
• Always roll and fold properly

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