Download - Measurement instruments and tools
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Measurement
Instruments &Tools
Accurate Measurement
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Objectives
What is an accurate measurement
Review different types of measuring
instruments and their application
Learn how to calibrate instruments
Care and maintenance of instruments
Advanced diagnostic session
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Why are these measuring devices
called instruments
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Definition of Accurate
(from dictionary) free from error especially as the result of
care
able to give an accurate result
What happens if you do not measure accurately?
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Examples of
Failed Measurements
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http://www.youtube.com/watch?v=bxB3rV9KpFg&feature=relatedhttp://www.youtube.com/watch?v=bxB3rV9KpFg&feature=relatedhttp://www.youtube.com/watch?v=bxB3rV9KpFg&feature=relatedhttp://www.youtube.com/watch?v=bxB3rV9KpFg&feature=relatedhttp://www.youtube.com/watch?v=bxB3rV9KpFg&feature=related -
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Name here
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Measuring Instruments
Micrometers
Vernier Calipers
Dial Indicators Telescopic Gauges
Small Hole Gauges
Thickness Gauges Straight Edge
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Outside Micrometer
Instrument for making precise linear measurements
of dimensions such as diameters, thicknesses, and
lengths of solid bodies.
It consists of a C-shaped frame with a movable jawoperated by a screw. The accuracy of the
measurements depends on the accuracy of the
screw-nut combination.
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Imperial and Metric
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Inside Micrometer
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Depth Micrometer
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Outside Micrometer
Inside Micrometer
Depth Micrometer
Can you identify the metric micrometer ?
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Digital Micrometers
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Combination Digital
Metric or Imperial
at the push of a
button
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Parts of a Micrometer
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Precision Instrument
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Micrometer Donts
Do not drop
Do not run over
Do not over tighten (it is not a vice) Do not drop in chemicals
Do not leave it covered in grease
Do not let anyone borrow it Do not leave lying around
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Micrometer Dos
Keep clean
Keep calibrated
Keep in storage box
Keep locked up
Keep away from everyone
Keep in practice reading it !
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Using an Outside Micrometer
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Using a Depth Micrometer
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Using Inside Micrometer
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Brake Drum Micrometer
Essentially it is a heavy duty Inside Micrometer
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Measuring a brake rotor
What is the name of the micrometer in the picture?
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Steps to reading a micrometer
Calibrate unit Identify scale (metric or imperial)
Identify range of micrometer (size)
Read Sleeve first number you see Read Sleeve for second number
(graduation)
Read Thimble
Note-if it is a 4 digit mic, read last numberon Sleeve (will discuss later)
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Step # 1 Calibrate Micrometer
YouTube - measuring the thickness of a block using a micrometer
Before using any measuring instrument you must
check to ensure it is calibrated (accurate)
www.tgbcomputing.com
TGB Computing & Publishing
http://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.tgbcomputing.com/OnlineEd.htmhttp://www.tgbcomputing.com/OnlineEd.htmhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsI -
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Step # 2 Identify scale
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Step # 3 Identify Range (size)
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Where to find range
Imperial equivalent would be a 0-1
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Step # 4 Reading the Sleeve and
Thimble
Imperial Micrometer
31
2
Number on Sleeve
Graduation on Sleeve
Number on
Thimble
Thimble numbers go from 0 to 20
Example shows 0.341
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Sample Reading
First number
is the size of
the Mic
0.000
Example using a 0-1 Outside Micrometer
Second number
is the first
number
on Sleeve
.000
Third number
is .025 graduations
you see onSleeve
.025 x 2 = .050
Fourth number
is read on the
Thimble.016
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Recording Measurement from Sample
Reading
First reading Range of Mic.
01 so the first number would be 0.000 Second reading number on Sleeve
Number you see is Zero so it would be .000
Third reading graduation on SleeveTwo graduations exposed so number is .050
Final number is number on the Thimble
Final number is .016
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Total ReadingsFirst reading Range of Mic. 0.000
Second reading number on Sleeve 0.000
Third reading graduation on Sleeve 0.050
Final number is number on the Thimble 0.016
______
Total is ? 0.066
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Reading an Imperial Micrometer
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Reading an Imperial Micrometer
Exercise # 1 (2-3 mic)
Answer : 2.550
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Reading an Imperial Micrometer
Exercise # 2 (0-1 mic)
Answer: 0.802
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Reading an Imperial Micrometer
Exercise # 3 (1-2 mic)
Answer: 1.645
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Reading a Metric Micrometer
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Reading a Metric Micrometer
Notice that Thimble numbers are higher than the
Imperial Mic ? Thats how you know it is Metric scale.
Thimble numbers go from 0 to 45
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Example of 4 digit Metric Micrometer 0.0000
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Reading a Metric Micrometer
Exercise # 1 (0-25mm Range)
Answer : 12. 69
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Reading a Metric Micrometer
Exercise # 2 (0-25mm Range)
Answer : 23.99
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Telescopic Gauges
Spring loaded
Measure large inside dia.
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Using Telescopic Gauges
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Small Holes Gauges
Measure smallInside Diameters
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Dividers or Caliper
Instrument that consists of two
adjustable legs or jaws for
measuring the dimensions of
material parts.
Outside calipers measurethicknesses and outside diameters
of objects; inside calipers
measure hole diameters and
distances between surfaces.
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Standard Vernier Caliper
Instrument for making very accurate linear or angular
measurements.
Introduced in 1631 by Pierre Vernier (c . 15801637), it uses
two graduated scales: a main scale similar to that on a ruler,and a specially graduated scale, the vernier, that slides
parallel to the main scale and enables readings to be made to
a fraction of a division on the main scale.
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Why buy a Vernier Cal iper?
Durable Accurate measuring instrument
Multiple reading use
Easy to store and maintain
Readings that can be taken
Outside Diameter
Inside Diameter
Thickness Depth
Can this instrument not take place of a mic?
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Dividers or Caliper
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Small Holes Gauges
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Telescopic Gauges
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Dial Vernier Caliper
Digital Vernier Caliper
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Digital Vernier Caliper
YouTube - Digital Caliper Bug
http://www.youtube.com/watch?v=NVJRen5qlok&feature=relatedhttp://www.youtube.com/watch?v=NVJRen5qlok&feature=relatedhttp://www.youtube.com/watch?v=NVJRen5qlok&feature=relatedhttp://www.youtube.com/watch?v=NVJRen5qlok&feature=relatedhttp://www.youtube.com/watch?v=NVJRen5qlok&feature=related -
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Using a Vernier Caliper
YouTube - all about verniers
YouTube - measuring a weight using a vernier caliper
How to use and read a Vernier Caliper
Checking calibration of Vernier Caliper and allowing
for error
http://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=related -
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Reading a Vernier Caliper # 12.641
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Reading a Vernier Caliper # 2
1.581
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Reading a Vernier Caliper # 20.508
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Dial IndicatorsAny of a number of
deviation-type gauges that
indicate the amount by which
an object being gauged
deviates from the standard.This deviation is shown in
units of measurement, in
which movement of a
gauging spindle deflects apointer on a graduated dial
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Calibration of Dial Indicator
Turn dial until pointer
aligns with the Zero
TGB Computing & Publishing
http://www.tgbcomputing.com/OnlineEd.htmhttp://www.tgbcomputing.com/OnlineEd.htm -
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Note-example of
Metric Dial IndicatorCalibration button
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Dial Indicator with Stand
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Very useful instrument for checking Steering
and Suspension components
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S
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Simpler Measuring Devices
Thickness Gauges
Flat Blade Feeler Gauges
Wire Gauges Taper Gauge
M i F l G
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Metric Feeler Gauges
Imperial Feeler Gauges
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Imperial Feeler Gauges
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Straight Edge
Accuratelymachined surface
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References - Links
YouTube - all about verniers
YouTube - measuring a weight using a
vernier caliperYouTube - measuring the thickness of a
block using a micrometer
www.tgbcomputing.com
TGB Computing & Publishing
http://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.tgbcomputing.com/OnlineEd.htmhttp://www.tgbcomputing.com/OnlineEd.htmhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=haK-eWV_JsIhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=iSHUTz3Cq0c&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=relatedhttp://www.youtube.com/watch?v=kTLhmptHAPc&feature=related