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Measuring Tools and Systems

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					Measuring Tools and
     Systems
       Chapter 5

       Page 40
        Measuring Systems U.S.
   U.S. =
     Length= miles, feet, inches, fractions of an inch,
      tenths, hundredths, thousandths, ten thousandths,
      and decimals.
     Pressure= pounds per square inch (p.s.i.)& vacuum
      (inches of mercury)
     Weight= pounds
     Liquids= gallons, quarts, pints, and ounces, cubic
      inches
     Temperature= Fahrenheit
     Torque= Foot pounds
        Measuring Systems Metric
   Metric=
     Length= kilometers, meters, centimeters, millimeters
     Pressure= Kilograms per square centimeter

     Weight= kilograms, grams,

     Liquids= Liters, cubic centimeters

     Temperature= Celsius

     Torque= Newton Meters
Measuring Tools
   Ruler/Tape Measure
Feeler Gauges and Wire Gauges
                 Safety Check

   Never use feeler gauges on operating machinery.

   Feeler gauges are strips of hardened metal that
    have been ground or rolled to a precise
    thickness. They can be very thin and will cut
    through skin if not handled correctly.
                 Points to Note
   There are many types of feeler gauges, each with a
    specific application.
   Feeler gauges usually come in sets with a number of
    blades. The thickness of each blade is marked in
    thousandths of an inch and hundredths of a millimeter.
    A marking of 0.040 indicates the feeler is 40
    thousandths of an inch thick. It may also indicate a
    measurement of 1.02 millimeters. A feeler marked
    0.005 indicates the thickness is 5 thousandths of an
    inch. It may also indicate 0.12 millimeters.
   Some sets contain feelers made of brass. These are to
    take measurements between magnetic components.
   When measuring a spark plug gap, it is preferable to use
    wire feeler gauges. These feelers use accurately
    machined pieces of wire instead of metal strips.
   If the feeler gauge feels too loose when measuring a
    gap, select the next size larger and measure the gap
    again. Repeat this procedure until the feeler gauge fits
    snugly in the gap. If the feeler gauge is too tight, select a
    smaller size until the feeler gauge fits snugly in the gap.
Feeler Gauges
             Vernier Calipers




Picture from pg 42
                    Calipers
   Outside Measurement- Measure outside
    diameters of an object. (Ex. Camshaft)
   Inside Measurement- Measure inside diameters
    of an object. (Ex. Cylinder bore)
   Depth Measurement-Measure depth of an
    object. (Ex. Bolt hole depth)
Micrometers
              Digital Mic



                 U.S & Metric


                 Inside Mic



                  Bore Gauge




               Depth Gauge
                 Micrometers
   Very accurate
   Measures to the nearest ten thousandth
   Very Fragile
   Tricky to use
   Easy to use after you learn how
Micrometers
      How to Read the Micrometer

                          1      2      3        4     5     6        15




                                                                      10
              2-3 inch micrometer    _____2.663_____

First find “dollars”                                 = 600 (don’t use decimal point)
Next find Quarters                                   = 50 (two quarters equals 50 cents)
Next Find Pennies                                    = 13 ( Pennies are on the thimble)
                                       +__________

Now Place Decimal Point Here                            .663
Find the Size of the Micrometer and Place Here         2.663 (use smaller of the two numbers)
                        Lets Do Another

                               2     3     4     5     6    7        0



                                                                     20
                   0 – 1 inch micrometer ____0.774_____


First find “dollars”                             = 700 (don’t use decimal point)
Next find Quarters                               = 50 (two quarters equals 50 cents)
Next Find Pennies                                = 24 ( Pennies are on the thimble)
                                                 +__________

Now Place Decimal Point Here                          .774
Find the Size of the Micrometer and Place Here       0.774 (use smaller of the two numbers)
Dial Indicators
                 Dial Indicators
   Measures movement
   Measures to the nearest thousandth
   Must set to zero and move object to it’s stop
    move the opposite way to read the movement.


                           Bore Gauge-
                           Another type of
                           Dial Micrometer
Dial Indicators
Other Measuring Tools




Thread Gauges     Height Gauges
     Other Measuring Tools




Hole & Tee Transfer Gauges   Squares
         Other Measuring Tools



 Vacuum Gauge                            Compression Tester




                       Torque Wrenches

                                         Antifreeze Tester
Fuel Pressure Tester
                    Your Job.
   Complete chapter Questions 1-10 (review) and 1-5
    (ASE-style). Page 51. Also the eight mic readings
    on page 52
   Write on a separate paper and write out the
    complete question and your answer. ( do not write
    the other answer options).
   Complete the chapter worksheet (I will give it
    out). You may write on it.
   File these items in your note book.
   Notebooks will be graded in the future.

				
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