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Basic Machining 1

Quiz by ruben medroso

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25 questions
Show answers
  • Q1
    Which of the following are potential safety hazards when operating a lathe?
    all of the above
    Stopping the machine using the emergency stop and wearing barrier cream
    Wearing PPE and applying safety standard
    Removing long stringy chips with bare hands and guards when turning to view the operation
  • Q2
    Which two of the following are good working practices?
    Leaving the machine while it is running and wearing gloves while machining.
    Wearing loose sleeved overall and leaving waste bins in gangway.
    Tools and equipment should be clean and returned to designated place and documentation must be returned for safe keeping
    Storing oily rags in overall pockets and Removal of metal chips from lathe tray with bare hands.
  • Q3
    Which of the following can be used to protect a finished diameter when using a work carrier while turning between center?
    Brass and tin sheet
    Cloth and paper
    All of the above
    Sand paper and cardboard
  • Q4
    What are the effects of clamping the workpiece in a chuck or work holding device?
    To crush or damage the work
    To enable the work to rotate at high speeds
    To be able to leave the machine running unattended
    To be held securely while revolving at the same time as being cut
  • Q5
    Over tightening the workpiece in the chuck hard jaws can cause?
    Good surface finish
    The ability to run at higher speeds
    Accurate dimensions
    Indentations or distortion to the work piece
  • Q6
    Backlash in machine slides and screws is a result of ?
    Not using coolant
    Using the wrong spindle speeds
    Selecting the wrong feedrate
    The wear between a lead screw and drive nut
  • Q7
    How can backlash be overcome?
    By increasing the feed rate
    By reducing the depth of cut
    By applying the turning pressure in one direction only
    By taking more trial cuts
  • Q8
    A trial cut was taken on a lathe. The readings on the workpiece are 2.240" at the headstock end and 2.220" at the tailstock end. To align the center which way must the tailstock must be adjusted?
    0.010 inches toward the operator
    0.005 inches toward the operator
    0.020 inches away from the operator
    0.010 inches away from the operator
  • Q9
    When taking roughing cuts, what is the effect on tool life?
    High pressure and temperatures are put on the cutter causing the cutting edge to break down
    Low pressure and minimal heat generation is put on the cutter giving good surface finish
    The tool leaves a better surface finish and has minimal tool wear
    All of the above
  • Q10
    What is the name given to the type of tool that would be used for general turning and facing?
    Chamfer tool
    Right hand knife edge tool
    Undercut tool
    Forming tool
  • Q11
    Which of the following statements best describes a root cause for excessive tool wear when machining a hard material?
    The cutting tool is defective and must be replaced
    The feed is set slightly below the recommended feed rate
    The depth of cut is too shallow and must be increased
    The RPM is set too high
  • Q12
    How is feed rate designated on a lathe?
    Inches per minute
    Inches per revolution
    Feet per second
    Feet per revolution
  • Q13
    What is the term used for the type of material that does not require cutting fluid to be used?
    Low carbon
    High tensile
    Self lubricating
  • Q14
    Which of these are most common signs of tool wear and imminent failure?
    Clean edge and no smoke
    Chips are uniform in colour and size
    A high quality surface finish
    A burning smell, metal chips becomes blue and vibrating hand wheel
  • Q15
    A small pip was left on the end of a workpiece during a facing operation. The root cause for this is:
    The tool is set on centre height
    The tool is set below center height
    The tool is incorrectly ground
    The end relief of the tool is too large

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