EMM Unit 2 Angular Measurement Ppt
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Transcript of EMM Unit 2 Angular Measurement Ppt
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L INEAR ANDANGULARMEASUREMENT
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SLIP GAUGE Slip gauges are rectangular
blocks of steel having a cross-section of about 30 by 0 !!
"or!al setRange Step Pieces
#00 to #00$ 0#00 $
#0 to #0$ 0#0 $
# to #$ 0# $
to $ $0 to $0 0 $
%otal &'
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Special Set
Range Step Pieces
#00 to #00$ 0#00 $#0 to #&$ 0#0 &$
#' to $#' 0#' $
0 to $0 0 $
%otal ()
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*lassi+cation
AA slip gauges
A slip gauges an,
slip gauges
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AA slip gauges .aster slip gauges
Accurate to plus or !inus t/o!icrons per !eter
A slip gauges
eference purpose%ype A is guarantee, accurate up to
plus or !inus four !icrons per !eter
slip gauges 1orking slip gauges
%ype 22 for plus or !inus eight!icrons per !eter
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*lasses
Grade 2
Grade 1
Grade 0
Grade 00
Calibration grade
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Grade 2
%his is the /orkshop gra,e
%ypical uses inclu,e setting up
!achine tools positioning !illing
cutters an, checking !echanical
/i,th#
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Gra,e
Use, for !ore precise /ork -tool
roo!#
%ypical uses inclu,e setting up
Sine bars an, sine tables
*hecking gap gauges an,
Setting ,ial test in,icators to 5ero
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Gra,e 0
%his is !ore co!!only kno/n as the
Inspection gra,e
Inspection 6epart!ent only /ho
have access to this gra,e of slips
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Gra,e 00
%his gra,e /oul, be kept in the
Stan,ar, oo! an, /oul, be kept
for /ork of the highest precision only#
6eter!ination of any errors present
in the /orkshop or Gra,e 7 slips#
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*alibration gra,e
*alibration gra,e are use, forcalibration of slip gauges other!easuring instru!ents
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Wringing: It takes place /hen t/o 8at lappe, surfaces arc
place, in contact /ith a sli,ing !ove!ent#
It is the property of !easuring faces of a gaugeblock of a,hering by sli,ing or pressing thegauge against the !easuring faces of othergauge blocks of ,atu! surface /ithout the use of
any e9ternal !eans# It is ,ue to !olecular a,hesion bet/een a li:ui,
+l! an, the !ating surface of the 8at surfaces#
%he success of precision !easure!ent by slip
gauges ,epen,s on the pheno!enon of /ringing#
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SLIP GAUGE
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1I"GI"G ;< SLIP GAUGE
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Interfero!eter
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Principle
Interfero!eters are opticalinstru!ents use, for !easuring8atness
6eter!ining !inute ,i=erences inlength by ,irect reference to the/avelength of light#
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ere the error is in,icate, by the a!ount by
/hich the fringes are out of parallelis! /ith
those on the base plate
If the /ork piece is concave or conve9fringe pattern /ill be as sho/n in
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Angularmeasurement
A l M t
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Angular Measurement :-A)Prtractrs
@ernier evel Protactors
7@Universal bevel protactor3@;ptical bevel protactors
!) Sine "ars @ Sine *enters
7@ Sine %able#)Angle GaugesD)Spirit Le$elE)#linmeter
@ernier [email protected]!eter clino!eter
G) Aut #linmeter%) Angle De&&r
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'ernier "e$el
Prtactr
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Universal evel protractor
Mec(anical tpe
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;ptical bevel protractor
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Measurement using !e$el prtractr
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Sine "ars
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.easure!ent using sine bar
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APPLI*A%I;"
;< SLIPGAUGES
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Measurement * large an+ (eig(t
,r&piece
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Measurement * large
,r&piece
A+$antages * sine "ar:-
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A+$antages * sine "ar:-
@It is use, for accurate an, precise angular
!easure!ent7@It is available easily3@Its is cheap
Disa+$antage:-
@%he application is li!ite, for a +9e, centre
,istance bet/een t/o plugs or rollers#7@ It is ,iBcult to han,le an, position the slip
gaugesIf the angle e9cee,s &' ,egree sine bar are
i!practicable an, inaccurate#
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SUR#ES . ERRR IN SINE "AR :-
@ Error in ,istance bet/een rollers7@ Error in slip gauges co!bination use, for angle setting
3@ Error in e:uality of si5e of rollers an, cylin,ers
accuracy in the for! of rollers#&@ Error in parallelis! of roller a9es /ith each other#
'@ Error in 8atness of the upper surface of the bar
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SINE#ENTRE
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SINE TA"LE
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ANGLE
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ANGLEGUAGES
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A"GLE GAUGES
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SPIRIT
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SPII% LEEL
SPIRITLE'EL
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#LINMETER
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#LINMETER
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MI#RMETER#LINMETER
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ALIGNMENT
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ALIGNMENTTELES#PE
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AUT
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AUT#LLIMATR
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In/ecte+
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Angle +e&r
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Angle +e&r
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