CASA Part 66: Maintenance Practices for Grinding Machines
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Questions and Answers

What is the correct way to hold flat or sheet work on a grinding machine?

  • Holding it directly on the wheel
  • Holding it with the back part lowered
  • Holding it at an angle to the wheel
  • Holding it in a way that prevents hammering or vibration (correct)
  • What should you do to maintain even wear on the abrasive wheel?

  • Apply side pressure on the wheel
  • Grind only on the corners of the wheel
  • Rotate the wheel periodically
  • Move the work across the face of the wheel (correct)
  • What is the risk of using the side of an abrasive wheel not designed for side grinding?

  • The wheel may break or the work may become jammed (correct)
  • The wheel may become jammed with the work
  • The work may become overheated
  • The grinding process may slow down
  • Why should you avoid quenching high-speed steel work directly in cold water?

    <p>It may cause cracking of the edge</p> Signup and view all the answers

    What is the primary reason for the loss of cutting efficiency of a grinding wheel?

    <p>The abrasive particles become blunt from cutting the hard material</p> Signup and view all the answers

    What is the purpose of having a container of cool, clean water nearby when grinding small work?

    <p>To cool the work as it becomes heated</p> Signup and view all the answers

    How can glazing of the grinding wheel be prevented?

    <p>By selecting a wheel with a softer grade of bond</p> Signup and view all the answers

    What is the recommended way to cool small work made from high-speed steel after grinding?

    <p>Allowing it to cool in air</p> Signup and view all the answers

    What is the main cause of grooving on the surface of the grinding wheel?

    <p>Applying too much pressure in one position</p> Signup and view all the answers

    Why should you avoid grinding on the outside edges of the wheel?

    <p>It results in rapid wear and causes a curved surface on the wheel</p> Signup and view all the answers

    What is the primary reason for selecting the correct type of wheel for the material being ground?

    <p>To prevent loading and glazing conditions</p> Signup and view all the answers

    Why should you not use a small bench grinder for heavy, rough grinding?

    <p>It is not designed for heavy, rough grinding and may damage the grinder</p> Signup and view all the answers

    What is a key reason to keep the drill cutting and not allowing it to just rub?

    <p>To prevent the drill from becoming blunt</p> Signup and view all the answers

    What type of lubricant is suitable for drilling copper and brass?

    <p>Kerosene</p> Signup and view all the answers

    What is the correct order of steps when drilling a part?

    <p>Select the correct size drill, check the speed, hold work securely, feed the drill slowly</p> Signup and view all the answers

    Why should you wear eye protection when drilling?

    <p>To protect your eyes from potential debris</p> Signup and view all the answers

    What should you do before drilling a hole with a diameter greater than 10 mm?

    <p>Drill a pilot hole</p> Signup and view all the answers

    What should you inspect before using a drill?

    <p>Electrical cords and air hoses, and the tools themselves for damage</p> Signup and view all the answers

    What is the recommended air pressure at the tool according to most manufacturers?

    <p>90 psi</p> Signup and view all the answers

    Why should you avoid directing compressed air at another person?

    <p>It can cause serious injury or death</p> Signup and view all the answers

    What should you do to protect the air hose from damage?

    <p>Move it out of the way of vehicles and avoid dragging around sharp corners</p> Signup and view all the answers

    Why should you check the exhaust air ducts on the tool?

    <p>To ensure they are clean and not damaged</p> Signup and view all the answers

    What should you do before connecting or disconnecting any pneumatic tools?

    <p>Turn off the air supply</p> Signup and view all the answers

    Why should you not use compressed air to clean your clothes or hair?

    <p>It can cause eye damage or ruptured ear drums</p> Signup and view all the answers

    What is the recommended direction of rotation for the spindle on the right?

    <p>Clockwise</p> Signup and view all the answers

    What is the result of using the wrong type of wheel for the material being ground?

    <p>Loading of the grinding wheel</p> Signup and view all the answers

    What is the purpose of referring to the manufacturer's handbook for the grinding wheel?

    <p>To review the specification of the wheel</p> Signup and view all the answers

    What is the characteristic of a grinding wheel suitable for grinding soft, ductile materials?

    <p>Wide spacing of the grains</p> Signup and view all the answers

    What is the result of grinding hard materials on a wheel with too hard a grade of bond?

    <p>Glazing of the grinding wheel</p> Signup and view all the answers

    What is the purpose of off-hand grinding?

    <p>To grind specific shapes or profiles</p> Signup and view all the answers

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