Surface Roughness Measurement FINAL

8/18/2019 Surface Roughness Measurement FINAL

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Surface Roughness Measurement

Section 3, Group 5

SOURABH BALDWA

2013A4PS400P

NIKHIL NAIR

2013A4PS341P

GOGRI ADITYA BHUSHAN

2012B3A4541P

GOPAL YOGHESH BHATT2012B3A4606P

ADITYA RAKESH KULKARNI

2012B5A4411P

Instructor In- Charge: Dr. Tufa !"a#ra B$ra


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Objectives:

1) Measurement of surface roughness for various cutting speeds, feed rates and depths of

cut.2) Prediction of surface roughness from machining conditions.

Apparatus Required

Ta%&'urf (')ru*$) a# )ur$# +,r- ($/$ Vernier Calipers.

Theor:

Surface Roughness- T"$ a% 'urfa/$ r,u"$'' /a $ /,'(#$r$# a' a 'u* ,f )+, )$/",%,(/a%

ara*$)$r' r,u'a) Ideal surface roughness resulted from tool geometry and feed;

b) Natural surface roughness resulted from irregularities in the machining process. One of the main factors contributing to natural roughness is the occurrence of a built-up-edge.

T"$ $,*$)r(/a% /"ara/)$r(')(/' ,f a 'urfa/$ (/%u#$

. Macro-deviations,

!. "urface #aviness, and

$. Micro-irregularities. T"$ 'urfa/$ r,u"$'' (' $a%ua)$# & )"$ "$(") R) a# *$a r,u"$'' (#$ Ra,f )"$ *(/r,7 (rr$u%ar()($'.Surface roughness numberI) r$r$'$)' )"$ a$ra$ #$ar)ur$ ,f )"$ 'urfa/$ fr,* $rf$/)(, ,$r a r$'/r($#

'a*%( %$)" 8u'ua%%& '$%$/)$# a' 0.9 **:Surfa/$ r,u"$'' u*$r 8Ra: (' $r$''$# ( *(/r,'. Ra ; 8"1


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>I) (' )"$ r,%$ ,f )"$ a/)ua% 'urfa/$ ,)a($# & ('"( ,$ra)(,.!Reference pro#"e$ Rf >I) (' )"$ r,%$ ), +"(/" )"$ (rr$u%ar()($' ,f )"$ 'urfa/$ ar$ r$f$rr$# ),. () a''$')"r,u" )"$ "("$') ,() ,f )"$ actua" r,%$.!%atum pro#"e$ %f >I) (' )"$ r,%$ ara%%$% ), )"$ r$f$r$/$ r,%$ .() a''$' )"r,u" )"$ %,+$') ,()

B ,f )"$ a/)ua% r,%$!Mean &ro#"e$ Mf >I) (' )"a) r,%$ +()"( )"$ 'a*%( %$)" /",'$ 8L: 'u/" )"a) )"$ 'u* ,f )"$*a)$r(a%7%%$# ar$a' $/%,'$# a,$ () & )"$ a/)ua% r,%$ (' $?ua% ), )"$ 'u* ,f)"$ *a)$r(a% ,(# ar$a $/%,'$# $%,+ () & )"$ r,%$.!&ea' to va""e height$ Rt>I) (' )"$ #(')a/$ fr,* )"$ #a)u* r,%$ ), )"$ r$f$r$/$ r,%$.!Mean roughness inde($ Ra>I) (' )"$ ar()"*$)(/ *$a ,f )"$ a',%u)$ a%u$ ,f )"$ "("$') $)+$$ )"$ a/)ua%a# *$a r,%$.

&rocedure:

• %hree specimens for varying feed, speed and depth of cut conditions are produced on

lathe.

• Open &ltra soft#are.

• In the appearing dialogue bo' set the current traverse unit carriage position to (ero.

• "lo#ly bring the stylus on to the specimen until it touches the specimen. %o mae sure

that there*s a touching bring the stylus do#n more until the reading becomes (ero.

• +lic on Measure nalyseMeasure and nalyse.

• %he Measure /ialog contains the settings for a re0uested measurement.

Measurement "tart Position. %his is the absolute position on the traverse #here you

#ant the measurement to start. %his field is used only if the 1Immediate2 field is not

checed.

/ata 3ength eep it 4 mm.

5un up 3ength eep it 4.$ mm.

5etract direction is default.

Measurement "peed 4.!6 mm7sec.

/isplay Measurement. 8hen this bo' is checed the measurement results are

automatically displayed after the measurement.

• 9rom the displayed ra# profile and surface roughness profiles, note do#n the 5 a value.

• No# rotate the #or piece and tae $ readings similarly along the circumference for one feed

value.


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Observation:

@$$#8**=r$:

S$$#8r*:

DO! 8**: Ra 8μ*: $a Ra 8μ*:

0.04 14 1

0.292

0.2230.26C3

0.2656

0.06 14 1

0.2544

0.264330.26310.255

0.09 14 1

0.3169

0.32C0.3216

0.350C

0.06 14 1 0.4313 0.40315

0.3C63


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&recautions:

. %he stylus can tae readings of only :664m along the < a'is. =nsure that the #or

piece does not have surface irregularities larger than this or the stylus might brea.

!. >efore starting a reading, ensure that the stylus touches the surface of the #or piece

and not the burrs on the surface.

$. 8hile the profile of the surface is being measured, relative vibrations bet#een

#orpiece and stylus should be avoided.

Surface Roughness Measurement FINAL

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