Fractions and Line Lengths Quiz
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Questions and Answers

What is the purpose of transfer measurement?

  • To obtain a precise measurement with a micrometer
  • To measure the diameter of a component directly
  • To measure the length of a recess
  • To physically check a diameter or linear distance with an indirect measuring tool (correct)

    • What is the primary cause of parallax reading error?

  • Worn out rule ends
  • Using indirect measuring tools
  • The viewer's eyes not being inline or perpendicular to the rule or measuring device (correct)
  • Using basic measuring tools

    • What is the characteristic of indirect measuring tools?

  • They do not have a physical scale to measure a component (correct)
  • They have a physical scale to measure a component
  • They are used to measure the length of a recess
  • They are used to measure the diameter of a hole

    • What is the name of the type of caliper that uses a spring to measure?

    <p>Spring caliper</p> Signup and view all the answers

    What is the name of the part of the spring caliper that is used to adjust the measurement?

    <p>Adjusting nut</p> Signup and view all the answers

    What is the purpose of telescopic gauges and small bore gauges?

    <p>To transfer the dimensions of bores, holes, slots, grooves, and recesses</p> Signup and view all the answers

    What is the purpose of keeping the ends of the rule in good condition?

    <p>To ensure accurate measurements</p> Signup and view all the answers

    Which type of caliper uses a firm joint to measure?

    <p>Solid caliper</p> Signup and view all the answers

    What is the fractional equivalent of 1/2 in sixteenths?

    <p>8/16</p> Signup and view all the answers

    What is the purpose of using a dial indicator on a lathe with a 4-jaw chuck?

    <p>To compare the profiles on one end of the part with the profiles on the other end</p> Signup and view all the answers

    What is the measurement of 1 cm in millimeters?

    <p>12 mm</p> Signup and view all the answers

    What is the importance of keeping the rule square with the workpiece when taking measurements?

    <p>To ensure accurate measurements</p> Signup and view all the answers

    What is the result when the dial indicator shows no movement between the two ends of a part on a lathe?

    <p>The part is considered aligned</p> Signup and view all the answers

    What is the purpose of aligning the milling machine head?

    <p>To prevent the machined parts from being out-of-square</p> Signup and view all the answers

    What is the result when the dial indicator is set to a zero reading on both ends of a vise?

    <p>Any part secured in the vise will be parallel to the machine axes</p> Signup and view all the answers

    What is the purpose of using a dial indicator in machine alignment?

    <p>To ensure that the machine head is perpendicular to the table</p> Signup and view all the answers

    What is the measurement of 1/4 in thirty-seconds?

    <p>8/32</p> Signup and view all the answers

    What is the measurement of 3.0 inches in sixteenth?

    <p>3-0/16&quot;</p> Signup and view all the answers

    What is the purpose of a hook rule?

    <p>To measure the diameter of a hole</p> Signup and view all the answers

    What is the purpose of using a dial indicator on a milling machine table?

    <p>To ensure that the workholding device is parallel to the machine axes</p> Signup and view all the answers

    What is the purpose of the reference contacts in a dial bore gauge?

    <p>To help with alignment to the true axis of the bore</p> Signup and view all the answers

    What should be done after finding the lowest reading of the needle on the dial face during the setting/calibration process?

    <p>Adjust the bezel of the dial so that the zero mark lines up with this lowest reading</p> Signup and view all the answers

    What is the purpose of using a dial indicator in workpiece alignment?

    <p>To compare the profiles on one end of the part with the profiles on the other end</p> Signup and view all the answers

    What is the formula for actual reading using a dial indicator?

    <p>ACTUAL READING = COS O X DIAL READING</p> Signup and view all the answers

    What type of micrometer is recommended for increased accuracy during the setting/calibration process?

    <p>Vernier micrometer</p> Signup and view all the answers

    What is the first step in calibrating a dial bore gauge using a master ring?

    <p>Ensure the dial bore gauge and master ring are clean</p> Signup and view all the answers

    What is the purpose of a tape measure?

    <p>To measure lengths of various objects</p> Signup and view all the answers

    What is the first step in setting/calibrating a dial bore gauge with a micrometer?

    <p>Ensure the dial bore gauge and micrometer are clean</p> Signup and view all the answers

    What is the purpose of rocking the dial bore gauge back and forth during the setting/calibration process?

    <p>To find the lowest reading of the needle on the dial face</p> Signup and view all the answers

    What is the importance of understanding reading errors when using a rule?

    <p>To ensure accurate measurements</p> Signup and view all the answers

    What should be done after adjusting the bezel of the dial during the setting/calibration process?

    <p>Check the gauge again to ensure the needle points to the zero mark</p> Signup and view all the answers

    What is the primary purpose of using a dial bore gauge?

    <p>To measure the diameter of a bore and detect any out-of-round conditions</p> Signup and view all the answers

    What is the function of the contact plunger in a dial bore gauge?

    <p>To measure the diameter of the bore</p> Signup and view all the answers

    What is the purpose of rocking the dial bore gauge back and forth during calibration?

    <p>To find the lowest reading of the needle on the dial face</p> Signup and view all the answers

    What is the function of the reference contacts on the dial bore gauge?

    <p>To ensure the gauge is aligned square to the fixture</p> Signup and view all the answers

    What is the purpose of creating a gauge block stack up during calibration with a gauge block setting fixture?

    <p>To transform the gauge block distance from an outside dimension to an inside dimension</p> Signup and view all the answers

    What is the final step in calibrating a dial bore gauge using a master ring?

    <p>Check the gauge again to ensure the needle points to the zero mark</p> Signup and view all the answers

    What is the purpose of using a master ring in calibrating a dial bore gauge?

    <p>To ensure the gauge is aligned to the true axis of the ring</p> Signup and view all the answers

    What happens to the gauge block distance when it is placed in the setting fixture?

    <p>It is transformed from an outside dimension to an inside dimension</p> Signup and view all the answers

    How many times should the dial bore gauge be checked after adjusting the bezel of the dial?

    <p>Multiple times until the needle points to the zero mark</p> Signup and view all the answers

    Study Notes

    Basic Measuring Tools

    • Tape measure: a tool used to measure lengths, with markings on the tape to indicate different units of measurement (e.g. inches, centimeters, millimeters)
    • How to read a tape measure: video tutorials available
    • Rule measurement: using a rule to measure lengths, with markings on the rule to indicate different units of measurement (e.g. inches, centimeters, millimeters)
    • Methods of measurement: using a rule to measure rectangular pieces, round stock, and diameters
    • Measuring errors: parallax error, worn out rule ends, and taking measurements at an angle

    Indirect Measuring Tools

    • Definition: indirect measuring tools do not have a physical scale to measure a component, but instead physically check a diameter or linear distance and transfer it to a measuring tool to obtain the proper value
    • Transfer measurement (or comparison measurement): the process of physically checking a diameter or linear distance with an indirect measuring tool, and then transferring it to a measuring tool to obtain the proper value
    • Calipers: spring calipers and solid calipers, used to measure inner and outer diameters
    • Telescopic gauges and small bore gauges: indirect measuring tools used to accurately transfer the dimensions of bores, holes, slots, grooves, and recesses
    • Dial indicator correction formula: actual reading = cos O x dial reading

    Dial Indicator

    • Usage: used to provide a comparison between a measured (or known) feature and another feature
    • Workpiece alignment: used to align workpieces on a lathe with a 4-jaw chuck, ensuring that the part is aligned and has a common centerline
    • Work holding alignment: used to align workholding devices (such as vises or fixtures) on milling machine tables, ensuring that the part is parallel to the machine axes
    • Machine alignment: used to align machines, such as milling machines, to ensure that the head is perpendicular to the table in both axes
    • Inspection purposes: used to inspect parts, such as checking for taper in a bore or if the bore is out-of-round

    Dial Bore Gauges

    • Definition: a comparison tool used to measure diameters, with a dial readout, similar to telescopic gauges
    • Setting/calibration: can be set using a micrometer, master ring, or gauge block set fixture
    • Usage: used to measure bores, checking for taper and out-of-roundness, with interchangeable ends and reference contacts for alignment

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    NAIT Machinist Program - Basic Measuring Tools PDF

    Description

    Test your understanding of fractions and line lengths with this quiz. Identify and work with fractions in different denominators and calculate line lengths.

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