week 2 benchwork measurement
DESCRIPTION
miss tasneem- mechanical lab 2 (mechanical engineering)TRANSCRIPT
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Measurement,Marking out
& Fitting Practice
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STEEL RULER
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FEATURES :FEATURES :– Made from Stainless Steel.Made from Stainless Steel.– Size available : 150mm up to 1m.Size available : 150mm up to 1m.– For General Measuring PurposeFor General Measuring Purpose– Flexible usage Flexible usage – Easy to useEasy to use– Cheapest toolsCheapest tools
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STEEL RULER
in inches.usually performs in fraction ( eg. 1/8”, 5/16” )
Reading :Reading :
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Imperial Unit ( Inch )Imperial Unit ( Inch )
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STEEL RULER
in millimetre ( mm )usually performs with decimal point ( eg. 3.2mm)
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Metric UnitMetric Unit
Reading :Reading :
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ENGINEERS’ STEEL RULES
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Measuring Linear Dimension Measuring Linear Dimension
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ENGINEERS’ STEEL RULES
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Parallelism ?Parallelism ?
ALLOCATION OF POSITIONALLOCATION OF POSITION
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ENGINEERS’ STEEL RULES
Internal & External Diameter measure
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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Engineers’ Steel RulesEngineers’ Steel Rules
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Diameter ?Diameter ?
ALLOCATION OF POSITIONALLOCATION OF POSITION
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Engineers’ Steel RulesEngineers’ Steel Rules
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Diameter ?Diameter ?
ALLOCATION OF POSITIONALLOCATION OF POSITION
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ENGINEERS’ STEEL RULES
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
7 8 97 8 933
0.1 ~ 0.2 mm0.1 ~ 0.2 mmAccuracy ?Accuracy ?
Thickness of hair lineThickness of hair line
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OUTSIDE CALIPERS
Solution of measuring the Solution of measuring the ““unmeasurable diameter by a ruler “unmeasurable diameter by a ruler “
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OUTSIDE CALIPERS
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Reading taken with a rulerReading taken with a ruler
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OUTSIDE CALIPERS
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Reading taken with a rulerReading taken with a ruler
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OUTSIDE CALIPERS
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Diameter Diameter
Reading taken with a rulerReading taken with a ruler
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INSIDE CALIPERS
1 2 3 4 5 1 2 3 4 5 6 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15
Internal dimension measuringInternal dimension measuring
Reading with a rulerReading with a ruler
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VERNIER CALIPERS
1 2 3 4 5 6 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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VERNIER CALIPERS
External measurementExternal measurement
Internal measurementInternal measurement
Depth measurementDepth measurement
inside jawinside jaw
outside jawoutside jaw
depth finderdepth finderScaleScale
VernierVernier
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VERNIER CALIPERS
Inside dimensionInside dimension
Outside DimensionOutside Dimension
DepthDepth
Typical Measuring examplesTypical Measuring examples
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VERNIER CALIPERS
Typical Measuring examplesTypical Measuring examples
CCyy
dd DD
ccxx
C = X - ( d + D ) / 2C = X - ( d + D ) / 2
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cc
xx
VERNIER CALIPERS
Typical Measuring examplesTypical Measuring examples
yy
dd DD
CC
C = X + ( d + D ) / 2C = X + ( d + D ) / 2
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VERNIER READING
Scale
Vernier
0 10 20 30 40 50
0 2 3 4 5 6 7 8 9 01
49 mm49 mm
50 dividsions50 dividsions
Difference between scale and vernier :Difference between scale and vernier :
1 -1 - 49495050
= 1 - 0.98 = 0.02 mm= 1 - 0.98 = 0.02 mm
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0 10
0 21
VERNIER READING
Scale
Vernier Zero point
Reading = Reading = 00
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VERNIER READING
Scale
Vernier
0 10
0 21
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VERNIER READING
Scale
Vernier
0 10
0 21 overlap line
Reading Reading = 3.2= 3.2
0.2
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VERNIER CALIPERS
0 1 2 3 4 5 6 7 8 9 10
20 30 40 50 60
overlap line
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VERNIER CALIPERS
0 1 2 3 4 5 6 7 8 9 10
20 30 40 50 60
overlap line
20
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VERNIER CALIPERS
0 1 2 3 4 5 6 7 8 9 10
20 30 40 50 60
overlap line
20
0.58
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VERNIER READING ACCURACY
Scale
Vernier
length of n divisionslength of n divisions
length of (n - 1) length of (n - 1)
divisionsdivisions
n -1n -1nn
11
AccuracyAccuracy == 11 - -
== 11nn
n -1n -1nn
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VERNIER HEIGHT GAUGE
– Used in Used in connection with a connection with a surface table surface table fitted with a fitted with a carbide tips for carbide tips for marking the lines marking the lines on the workpieceon the workpiece
GRADUATEDGRADUATEDSCALESCALE
FINEFINEADJUSTMENTADJUSTMENT
SCREWSCREW
VERNIERVERNIERSCALESCALE
CARBIDECARBIDETIPPEDTIPPED
SCRIBERSCRIBER
BASEBASE
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VERNIER HEIGHT GAUGE
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VERNIER HEIGHT GAUGE
Check ZeroCheck Zero
Surface PlateSurface Plate
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VERNIER HEIGHT GAUGE
Set to desire heightSet to desire height
As a Marking toolsAs a Marking tools
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VERNIER HEIGHT GAUGE
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VERNIER HEIGHT GAUGE
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VERNIER HEIGHT GAUGE
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VERINER HEIGHT GAUGE
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VERNIER HEIGHT GAUGE
As a measuring toolsAs a measuring tools
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VERNIER HEIGHT GAUGE
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VERNIER HEIGHT GAUGE
DimensionDimensionof of
workpieceworkpiece
hh
Finding out Finding out the heightthe height
of workpieceof workpiece
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VERNIER HEIGHT GAUGE
xx
yy
hh
Finding outFinding outthe heightthe height
of stepof step
h = x -yh = x -y
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hh h-dh-dCC
VERNIER HEIGHT GAUGE
Round Rod ( d )Round Rod ( d )
C = h - d + D / 2C = h - d + D / 2
DD
Finding outFinding outthe height of hole the height of hole
centercenter
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MICROMETER
– used for used for measuring measuring external external diameter or diameter or thickness. thickness.
0 1 2 3
0
5
External MicrometerExternal Micrometer
AnvilAnvil SpindleSpindle
FrameFrame
BarrelBarrel
Lock NutLock Nut
ThimbleThimble
ThimbleThimbleRatchetRatchet
Workpiece to be measuredWorkpiece to be measured
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MIRCOMETER
0 1 2 3
0
5
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MICROMETER
0 1 2 3
0
5
0 1 2 3
0
5
Pitch = 0.5 mmPitch = 0.5 mm
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0
0
555
READING A MICROMETER
1 mm ( 2 turns of thimber )1 mm ( 2 turns of thimber )
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READING A MICROMETER
0
0
555
50 dividsions50 dividsionseach dividsion =each dividsion =0.50.5
5050= 0.01 mm= 0.01 mm
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READING A MICROMETER
0
0
555
6.50
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0
0
555
6.50
0.03
READING A MICROMETER
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READING A MICROMETER
0
0
555
6.50
0.03
6.53
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MICROMETER
Internal Miicrometer Internal Miicrometer - used to measuring- used to measuringinternal diameterinternal diameter
ororgroovegroove
0 1 2 3
0
5
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DIAL CALIPER GAGE
35
2025
30 15
10
MicrometerMicrometer
Dial CaliperDial Caliper
Check Zero pointCheck Zero point
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DIAL CALIPER GAGE
35
202530 15
10
WorkpieceWorkpiece
Checking Undercut dimensionChecking Undercut dimension
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LIMIT GAUGE( SNAP GAUGE )
Upper limitUpper limitLow LimitLow Limit
WorkpieceWorkpiece
Snap gaugeSnap gauge
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LIMIT GAUGE( SNAP GAUGE )
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LIMIT GAUGE( SNAP GAUGE )
Dimension is too large to fit requirementDimension is too large to fit requirement
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LIMIT GAUGE( SNAP GAUGE )
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LIMIT GAUGE( SNAP GAUGE )
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LIMIT GAUGE( SNAP GAUGE )
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LIMIT GAUGE( SNAP GAUGE )
Dimension too small to fit requirementDimension too small to fit requirement
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LIMITS GAUGE( SNAP GAUGE )
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LIMITS GAUGE( SNAP GAUGE )
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LIMIT GAUGE( SNAP GAUGE )
Dimension fit to requirementDimension fit to requirement