Measuring Tools and Systems

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Presentation transcript:

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 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 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 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) 1 2 3 4 5 6 15 10 2-3 inch micrometer _____2.663_____

Lets Do Another 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) 0 – 1 inch micrometer ____0.774_____ 2 3 4 5 6 7 20

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.