PRECISION MEASURMENTPRECISION MEASURMENT
VocabularyVocabulary1.1. British imperial (U.S.) Systems British imperial (U.S.) Systems 11.)11.)00.100.1
2.2. Metric system Metric system 12.)12.)inside micrometerinside micrometer
3.3. Psi Psi 13.)13.)dial caliperdial caliper
4.4. Foot- pounds & Newton meters Foot- pounds & Newton meters 14.)14.)dial indicatordial indicator
5.5. Plastigage Plastigage 15.)15.)depth micrometerdepth micrometer
6.6. O.D. O.D. 16.)16.)dial bore gauge dial bore gauge
7.7. I.DI.D. . 1717..))feeler gauge feeler gauge
8.8. Micrometer Micrometer 18.)18.)wire gaugewire gauge
9.9. Thimble Thimble 19.)19.)thread pitch gaugethread pitch gauge
10.10. sleeve sleeve 20.)20.)straight edgestraight edge
Precision measurement is needed to:Precision measurement is needed to: Mass produce products ( assembly line)Mass produce products ( assembly line) Interchangeability of partsInterchangeability of parts Function of assemblies ( oil clearance - ect) Function of assemblies ( oil clearance - ect) Correct fit of assembly.Correct fit of assembly.
In one sixteenth of an inch (1/16) there are In one sixteenth of an inch (1/16) there are sixty two and one half thousandths sixty two and one half thousandths (.0625) (.0625)
Fractions are not accurate enough for the Fractions are not accurate enough for the automotive industry. Every part on your automotive industry. Every part on your vehicle is manufactured using precision vehicle is manufactured using precision equipment capable of accuracy within equipment capable of accuracy within thousandths of an inch. thousandths of an inch.
Decimal systemDecimal system
1 . 5 6 81 . 5 6 8One’s Tenth’s Hundredth's Thousandth’s
4 place decimal4 place decimal
1 . 2 5 7 91 . 2 5 7 9One’s Ten’s Hundred’s Thousandth’s Ten Thousandth’s
Precision MeasuringPrecision Measuring
ToolsTools
Outside MicrometerOutside Micrometer
Outside mic’s come Outside mic’s come in one inch in one inch increments ( 0-1 1-2 increments ( 0-1 1-2 2-3) 2-3)
Can measure to the Can measure to the ten thousandth of an ten thousandth of an inch.inch.
Use three scales to Use three scales to get the reading. get the reading.
Outside MicrometerOutside Micrometer
Outside mic set
standards
Dial CaliperDial Caliper
Measures 0” – 6” O.D. I.D. & depth with .001 accuracy
Dial indicatorDial indicator
Checks for movement .001 accuracy
Snap Gauge (set)Snap Gauge (set)
Can a snap gauge give you a dimension?
Dial Bore gaugeDial Bore gauge
Best tool to check engine cylinder Bore - .0005 accuracy
Feeler gaugeFeeler gauge
Used to check ________ .001 accuracy
Spark plug gap gaugeSpark plug gap gauge
Thread pitch gaugeThread pitch gauge
Metric & std.
Straight edgeStraight edge
Accuracy along length - .001Always used with feeler gauge
Torque wrenchTorque wrench
Foot LBS. In LBS. & Newton Meters How many Ft. lbs. should wheel lugs be?
Plasti-gaugePlasti-gauge
Plasti-gauge crushed on journal Indicated clearance
crankshaft
Parts of an outside MicParts of an outside Mic
spindle
Anvil - carbide
Frame
Sleeve or barrel
Spindle lock
Thimble
Ratchet
How to Read a How to Read a MicrometerMicrometer
.025
.025
.500.010
Total : .535.025
Try these Mic’s
Micrometer PracticeMicrometer Practice
Read Thimble secondRead sleeve first.025 +
.025
.050 total
.125
.130
How to read a Dial How to read a Dial CaliperCaliper
.100
Read first
Read dial second
Total .100
.050
.739
1.000
Dial = .010
Total 1.010
This thing was actually used to BBQ!
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