LAPORAN AKHIR METROLOGI INDUSTRI MODUL: III PENGUKURAN KEBULATAN
DISUSUN OLEH : KELOMPOK 13 KHAIRUL ANWAR 1007121613 RENHARD NIPTRO G 1007113735 PANGGIH DWI RAHARJO 1007113746 ESAU PANDIANGAN S 0907136053
LABORATORIUM PENGUKURAN PROGRAM STUDI SARJANA JURUSAN TEKNIK MESIN FAKULTAS TEKNIK UNIVERSITAS RIAU
2011
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KATA PENGANTAR
Puji Puji syuk syukur ur kehad kehadir irat at Alla Allah h swt. swt.,, yang yang tela telah h meli melimp mpahk ahkan an rahm rahmat at dan dan karu karuni nian any ya
sehi sehing ngga ga
penu penullis
dapa dapatt
meny enyeles elesai aika kan n
lapor aporan an
metr etrolog ologii
tentang”PENGUKURAN KEBULATAN ” laporan laporan ini bertujuan bertujuan untuk untuk melengkapi melengkapi tugas dan sebagai sebagai referensi referensi bagi para pembaca pembaca
juga dapat dapat digunakan digunakan
untuk memahami memahami dan mempelajar mempelajarii tentang
Proses pengukuran kebulatan. Penulis Penulis juga juga menguca mengucapkan pkan terima terima kasih kasih kepada kepada pihak-p pihak-piha ihak k yang yang telah telah membantu membantu penulis penulis dalam menyelesaikan menyelesaikan lapoaran ini, sehingga sehingga makalah makalah ini dapat diselesaikan dengan sebaik mungkin dan tepat pada waktu yang telah ditentukan. Penulis menyadari bahwa laporan ini masih memiliki banyak kekurangan dan kesalahan. kesalahan. Untuk itu, penulis mengharapkan mengharapkan kritik dan saran yang membangun dari pembaca
untuk
kesempurnaan
makalah
ini
kedepannya.
Akhir
kata
Wassalamualaikum Wr. Wb.
Pekanbaru,
Desember 2011
Penulis
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DAFTAR ISI DAFTAR ISI..................................................................................................ii DAFTAR GAMBAR.......................................... GAMBAR..................................................................... ..............................................iii ...................iii ..................................................................................................................iii DAFTAR TABEL...........................................................................................iii BAB I............................................................ I.................................................................................................. ............................................... .........1 1 PENDAHULUAN............................. PENDAHULUAN........................................................ ...................................................... ....................................1 .........1 1.1 Latar Belakang....................................... Belakang.................................................................. ............................................1 .................1 1.2 Tujuan Praktikum........................................................... Praktikum...............................................................................1 ....................1 1.3 Alat Alat........................................... Alat...................................................................... ........................................... .......................2 .......2 1.4 Benda ukur............................................ ukur.............................................................................. ............................................ ..........3 3 1.5 Pelaksanaan Praktikum........................................ Praktikum.....................................................................4 .............................4 BAB II.................................................. II................................................................................................. ........................................................ .........4 4 TEORI DASAR.......................... DASAR..................................................... ........................................................ ......................................... ............5 5 2.1 Pengertian..................................... Pengertian................................................................................. .................................................... ........5 5 2.2 Dial Indikator..................................... Indikator......................................................................... ............................................... ...........6 6 2.3 Prinsip Kerja.................................................................. Kerja.......................................................................................7 .....................7 2.4 Bagian-Bagian Dial Indikator.............................................................7 2.5 Cara Penggunaan Dial Indikator......................................................10 2.6 Metode Pengukuran Kebulatan........................................................ Kebulatan........................................................10 10 BAB III.......................................................................................................12 DATA PENGAMATAN............................. PENGAMATAN........................................................ .................................................... ..........................13 .13 3.2 Perhitungan.......................................... Perhitungan............................................................................ ........................................... .........13 13 BAB IV............................................ IV....................................................................... ................................................... ................................ ........15 15 ANALISA DATA.........
............................15
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5.2 Saran..............................................................................................20 DAFTAR PUSTAKA........................................ PUSTAKA................................................................... ..............................................20 ...................20 LAMPIRAN...................................... LAMPIRAN................................................................. ...................................................... .................................22 ......22
DAFTAR GAMBAR
DAFTAR TABEL Tabel.3. 1 Hasil Pengamatan ...................................................... .................................................................. .............13 .13
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BAB I PENDAHULUAN 1.1 Latar Belakang
Jam ukur/dial indikator indikator adalah alat ukur pembanding pembanding yang digunakan digunakan dalam industripermesinan dibagianproduksi dan kamar ukur.prinsif kerjanya secara mekanik dimana gerak linier sensor menjadi gerak putaran jarum jam penunjuk. Pengukuran kebulatan merupakan pengukuran yang ditunjukan untuk memeriksa kebulatan suatu benda, atau dengan kata lain untuk mengetahui apakah suat suatu u bend bendaa bena benarr-be bena narr bula bulatt atau atau tida tidak, k, jika jika dili diliha hatt seca secara ra teli teliti ti deng dengan an menggunakan alat ukur. Komponen dengan kebulatan ideal amat sulit dibuat, dengan demikian kita harus mentolerir ketidak bulatan dalam batas-batas titik sesuai dengan tujuan dan fungsi dari komponen itu. Kebulatan mempunyai peranan penting dalam hal: Membagi beban sama rata, Menentukan umur komponen, Menentukan kondisi suaian, Menentukan ketelitian putaran, Memperlancar pelumasan. 1.2 Tujuan Praktikum
Praktikum dilakukan dengan tujuan sebagai berikut : 1. Memahami Memahami prinsip prinsip dasar proses proses pengukur pengukuran an kebulatan kebulatan 2. Dapat menggunak menggunakan an dan mengoperasi mengoperasikan kan alat ukur ukur kebulatan kebulatan 3. Mampu menganal menganalisa isa hasil hasil pengukuran pengukuran kebulatan kebulatan 4. Mampu mengambil mengambil kesimpul kesimpulan an hasil pengukuran pengukuran kebulatan kebulatan
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1.3 Alat Alat
Adapun alat-alat yang digunakan dalam praktikum adalah Unit Dial Indikator 1. Satu Unit Dial
Gambar. 1 Dial Indikator
2. Meja Rata Digunakan sebagai tempat kedudukan dial indikator
Gambar. 2 Meja Rata
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3. Water pa pass Digunakan Digunakan untuk mengukur mengukur kerataan kedudukan meja rata yang akan digunakan pada pengukuran kebulatan
Gambar. 3 Water pass
4. V Blok
Gambar 4 V Blok
1.4 Benda ukur
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1.5 Pelaksanaan Praktikum 1.
Meja Meja rata rata dilakuk dilakukan an pengece pengecekan kan dengan dengan menggun menggunakan akan water water pass pass dengan dengan menggunakan metode union jack (vertikal jack (vertikal dan horizontal)
1 2 3 4 2. Benda ukur ukur diberi diberi tanda pada pada pinggirny pinggirnyaa dan diberi diberi nomor urut urut searah searah jarum jarum jam
(1 sampai dengan 12) meja rata 3. Alat dan benda ukur diletakkan di atas meja kemudian diatur diatur sehinggan sehinggan sensor sensor jam ukur 4. Letakan benda ukur pada V blok , kemudian menempel pada permukaan benda ukur yaitu pada posisi nomor 1 5. Atur ketinggian ketinggian sensor sensor jam ukur ukur sehinggan sehinggan jarum menunjuk menunjuk nol 6. Putar (angkat (angkat)) benda ukur ukur dengan dengan hati-hati hati-hati dan dan perlahan perlahan sehingga sehingga sensor sensor jam jam ukur kurang lebih pada posisi nomor 2, baca kedudukan jam ukur 7. Ulangi prosedur prosedur nomor nomor 6 sampai sampai seluruh seluruh posisi posisi benda benda ukur ukur diperiksa diperiksa (dilakukan (dilakukan oleh pengamat A) 8. Lakukan Lakukan pengukuran pengukuran dengan cara cara membalik membalik arah arah putaran putaran benda ukur ukur (dari (dari nomor nomor 12 sampai 1) 9. Dengan tanpa mengubah set up, up, ulangi prosedur nomor 6 sampai 8 (dilakukan
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TEORI DASAR 2.1 Pengertian
Pengukuran Pengukuran kebulatan kebulatan merupakan merupakan pengukuran pengukuran yang ditunjukan ditunjukan untuk memeriksa kebulatan suatu benda, atau dengan kata lain untuk mengetahui apakah suat suatu u bend bendaa bena benarr-be bena narr bula bulatt atau atau tida tidak, k, jika jika dili diliha hatt seca secara ra teli teliti ti deng dengan an menggun menggunaka akan n alat alat ukur. ukur. Pengukura Pengukuran n
kebula kebulatan tan merupaka merupakan n salah salah satu dari tipe
pengukuran yang tidak berfungsi menurut garis. Kebulatan dan diameter adalah dua karakt karakter er geomet geometris ris yang yang berbed berbeda, a, meskip meskipun un demiki demikin n keduany keduanyaa saling saling berkai berkaitan tan.. Keti Ketida dakb kbul ulat atan an
akan akan
memp mempen engar garuh uhii
hasil hasil
pengu pengukur kuran an
diam diamet eter er,,
sebal sebalik ikny nyaa
pengukuran diameter tidak selalu akan menunjukan ketidakbulatan. Sebua Sebuah h bend bendaa yang yang berb berben entu tuk k sili silind nder er pada pada dasa dasarn rnya ya dalam dalam perb perbed edaa aan n tempat punya perbedaan jari-jari. Dengan menggunaakan alat ukur dial indikator pada benda ukur poros hasil proses bubut/palat bubut, serta alat bantu V blok dan dial standar standar kita kita dapat dapat melakuk melakukan an penguku pengukuran ran kebula kebulatan tan untuk untuk memeri memeriksa ksa kebula kebulatan tan benda tersebut. Dial indikator dapat digunakan untuk mengukur perubahan ketinggian pada permukaan suatu benda. Jadi dapat diketahui benda tersebut memiliki permukaan yang rata atau tidak. Dengan memanfaatkan prinsip yang sama, sebuah benda yang berbentuk silinder dapat diperiksa kebulatannya. Dengan menetapkan suat suatu u titi titik k pada pada sisi sisi sili silind nder er seba sebaga gaii acua acuan n (tit (titik ik nol) nol) kemu kemudia dian n mela melaku kukan kan pengukuran terhadap titik lain dapat diketahui apakah terjadi pelekukan atau
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Komponen dengan kebulatan ideal amat sulit dibuat, dengan demikian kita harus mentolerir mentolerir ketidakbulat ketidakbulatan an dalam batas-batas batas-batas titik titik sesuai sesuai dengan tujuan dan fungsi dari komponen itu. Kebulatan mempunyai peranan penting dalam hal: •
Membagi beban sama rata
•
Menentukan umur komponen
•
Menentukan kondisi suaian
•
Menentukan ketelitian putaran
•
Memperlancar pelumasan Saat kebulatan dibicarakan, selain penyebab dan cara penanggulangan ketidak
bulatan, pasti akan mengait dengan cara mengukur kebulatan dan bagaimana cara menyat menyatakan akan harga harga ketida ketidakbu kbulat latan, an, karena karena sampai sampai saaat saaat ini ada bebera beberapa pa defeni defenisi si mengena mengenaii parame parameter ter kebulat kebulatan. an. Ketida Ketidak k bulata bulatatan tan merupak merupakan an salah salah satu satu jenis jenis kesalahan bentuk dan umurnya amat berkaitan dengan beberapa kesalahan bentuk lainya seperti: •
Kesamaaan sumbu dan konsentrisitas (concentricity (concentricity))
•
Kelurusan ( straighness) straighness)
•
Ketegaklurusan ( perpendicularity) perpendicularity)
•
Kesejajaran ( parallelism) parallelism)
•
Kesilindrikan (clindricity (clindricity))
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yang dianggap sebagai acuan (patokan) dan acuan inilah yang biasa disebut orang sebagai “standar. Dial indikator adalah salah satu alat yang digunakan untuk mengukur kebulatan suatu suatu benda.B benda.Berd erdasa asarka rkan n jenis jenis alat alat ukur, ukur, Dial Dial Indika Indikator tor termas termasuk uk jenis jenis alat alat ukur pembanding (komparator (komparator ) . Karena alat ukur ini biasa digunakan untuk pembanding atau komparator, angka yang ditunjukan alat ukur ini merupakan selisih ukuran benda ukur dengan ukuran benda standar. Hasil pengukuran adalah merupakan jumlah angka yang ditunjukan oleh alat ukur tersebut dengan ukuran benda standar. Sedangkan menurut proses pengukuran geometri Dial Indikator termasuk proses pengukuran tak langsung yaitu pengukur yang dilaksanakan dengan menggunakan alat ukur dari jenis pembanding, stan standar dar dan alat alat ukur ukur bantu bantu.. Dime Dimens nsii benda benda ukur ukur adala adalah h juml jumlah ah harga harga yang yang ditunjukan oleh alat ukur pembanding dengan dimensi alat ukur standarnya
2.3 Prinsip Kerja
Prinsip Prinsip kerja Dial Indikator Indikator menggunakan pengubah mekanik mekanik (kinemati (kinematika) ka) yang yang meneru menerusak sakan an serta serta merubah merubah isyara isyaratt sensor sensor yang yang biasany biasanyaa berupa berupa geraka gerakan n translasi mejadi gerakan rotasi. Yaitu pasangan roda gigi dengan batang gigi dari sistem roda gigi yang diterapkann pada jam ukur (dial indikator).
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Gambar.6 Bagian bagian Dial Indikator
Beberapa hal yang perlu diperhatikan pada rancangan kinematik ini adalah:
Suatu gerakan gerakan translasi translasi sensor sensor sepanjang sepanjang satu pits batang gigi(rack;m gigi(rack;misalny isalnyaa 0,25 0,25 mm) mm) akan akan memu memuta tarr roda roda gigi gigi pasa pasang ngann annya ya (pin (pinio ion) n) sebe sebesa sarr 1/zp 1/zp
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lainnya tak saling bersinggungan, jadi ada celah di antaranyauntuk menjaga jangan sampai pasangan roda macet gara-gara ada kesalahan profil yang berharga positif) Bila putaran diubah arahnya, sementara roda gigi pemutar dan yang diputar tetap fungsinya, roda gigi pemutar akan berbalik dahulu untuk sepanjang celah gigi sebelum berfungsi penuh memutar roda gigi yang diiputar. Kejadian ini dinamakan sebagai keterlambatan gerakan balik (back-lash (back-lash)) Back-lash yang terjadi pada pasangan roda gigi gigi pemutar jarum penunjuk akan mengganggu pembacaan skala karena posisi jarum penunjuk yang berubahubah jika sensor sedikit berubah (bergetar) Untuk mengurangi efek back-lash digunakan back lash ccompensator yaitu roda gigi gigi pemuta pemutarr untuk untuk arah arah putara putaran n kebali kebalikan kan dengan dengan arah arah putara putaran n roda roda gigi gigi pemutar utama. Roda gigi pemutar utama berfungsi saat sensor bergerak naik dengan dengan daya daya dorong dorong berasa berasall dan ensor. ensor. Roda Roda gigi gigi pemuta pemutarr arah arah kebali kebalikan kan
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2.5 Cara Penggunaan Dial Indikator
Pengukuran kebulatan dilakukan dengan memutar benda ukur sejauh 360◦ dan sensor menyentuh menyentuh permukaan permukaan benda ukur yang diukur kebulatannya. kebulatannya. Pengukuran dilakukan untuk menemukan penyimpangan kebulatan benda ukur terhadap lingkaran sempurna. Hal tersebut merupakan hal yang sangat esensial dalam kontrol produksi mekanik.
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Gambar. 9 Least Squares Circle Circle
Minimum Circumscribed Circle
Metode Minimum Circumscribed Circle (MCC) menghitung lingkaran standar dengan jari-jari minimum yang dapat menutupi profil data. Hal ini
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Maximum Inscried Circle
Metode Maximum Iscribed Circle (MIC) menghitung menghitung lingkaran lingkaran standar standar dengan dengan jarijari-jar jarii maksim maksimum um yang yang ditutu ditutupi pi profil profil data. Hal ini dapat dapat diliha dilihatt pada gambar
Gambar.11 Maximum Inscribed Inscribed Circle
Minimum Zone Circle
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DATA PENGAMATAN 3.1 Pengamatan A dan B Tabel.3. 1 Hasil Pengamatan
No 1 2
Pengamat A No Simpangan indikator µm µm 1 2 Average -2 2 0 1 1 0 0 ,5 2
Pengamat B Simpangan indicator µm indicator µm 1 2 Average -2 1 -0,5 -1 1 0
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2.
=0,5 µm
3.
=2 µm
4.
=0,5 µm
5.
=1 µm
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2.
=0 µm
3.
=3 µm
4.
=0,5 µm
5.
=2,5
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4.1.1 Analisa Pengamatan A
0
2
2
1
4
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hasil hasil nilai nilai kebula kebulatan tan yang yang didapa didapatt ada bebera beberapa pa titik titik yang yang berbeda berbeda dan ada beberapa titik yang nilai kebulatannya sama.
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0
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nomor 12 dan 11S/D nomor 1) harga yang didapatkan juga berbeda.Setelah hasil
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5.1 Kesimpulan
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•
A.Hald, Statistical Theory With Engineering Applications,Jhon Willey &
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