EMM Unit 2 Angular Measurement Ppt

5/17/2018 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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EMM Unit 2 Angular Measurement Ppt