Cutting and shaping

• What is the best hand saw for shaping plastics?

  The Coping Saw.
• Why is the Junior Hacksaw considered good for cutting plastics?

  It is effective but restricts the ability to cut certain angles due to the blade's width.
• What should you do when marking out for cutting plastics?

  Always cut outside the markings to leave some correction space.
• What is the key to making a correct cut in plastics?

  It is about a smooth, consistent cutting stroke, not strength.
• What is the recommended stance while cutting plastics?

  Keep your forearm straight while bringing the saw back.
• How can you achieve the quickest accurate cut in plastics?

  Use as much of the blade as possible.
• What angle should the blade be kept at while cutting?

  At a 90-degree angle to the material.
• How should you adjust the blade when using a Coping Saw to cut curved shapes?

  Slowly adjust the blade by twisting your wrist while keeping it at a 90-degree angle.
• What are the four stages of filing plastic edges known as?

  CDEF: Cross File, Draw File, Even Out, and Finish.
• Why is filing important in working with plastics?

  To produce a smooth clean edge to your material.
• Why does filing take a long time?

  Because you may not be using the file correctly.
• What is the purpose of having multiple stages in the filing process?

  Each stage has a part to play to ensure a smooth surface.
• What type of file should be used for a curved edge?

  A Round File or a Half-Round File.
• What is the anatomy of a file composed of?

  Tang, Heal, Edge, Face (or Belly), and Point.
• What are file cards used for?

  To clean files by removing any blockages.
• What is the difference between a single cut and a double cut file?

  A single cut produces a smooth finish, while a double cut produces a rough finish.
• How should you hold the file for balance and pressure?

  Hold the handle firmly with your index finger out onto the file and pinch the tip of the file firmly.
• What is the correct technique for cross filing?

  Use the file in one direction only, moving it along the edge at a 90-degree angle.
• What is the second stage of filing called?

  Draw Filing.
• How can Wet-and-Dry paper be used effectively in the filing process?

  Wrap it around the file and replicate the Draw File maneuvers.
• What is the purpose of the final stage of filing?

  To apply a polish to the plastic for a smooth finish.
• What can be used to polish the plastic?

  Soap or a polish with a cloth.
• What are the steps involved in the filing process for plastics?

  1. Cross File: Remove large bumps or saw marks.
  2. Draw File: Smooth the edge along the cut line.
  3. Even Out: Use Wet-and-Dry paper for a very smooth finish.
  4. Finish: Apply polish to the plastic.
• What will be covered next after the overview of filing and bending plastics?

  3D Printing with Plastics.