BAB I PENDAHULUAN
1.1 1.1 Latar Latar Belak Belakang ang
Dala Dalam m duni duniaa indu indust stri ri sebu sebuah ah pros proses es manuf manufact acturi uring ng diharapkan mengha menghasil silkan kan produ produk k dengan dengan kualit kualitas as tingg tinggi, i, karena karena semaki semakin n ting tinggi gi teknologi yang digunakan, maka semakin tinggi pula tuntutan terhadap kualitas produk yang dihasilkan. Kualitas tersebut salah satunya adalah akurasi dan kepresisian yang tinggi suatu produk atau part . Saah satunya yang yang berp berper eran an adal adalah ah peng penggu guna naan an ampl amplas as pada pada manuf manufact acturi uring ng untuk mendapatkan permukaan yang halus serta mempunyai tingkat kepresisian tinggi. Integrasi dari perakitan merupakan hal yang perlu diperhatikan, sehinga tidak perlu terjadi kesalahan komunikasi pada proses assembling yang mengakibatkan kerugian terhadap material, waktu kerja, dan biaya. Pada kesempatan kali ini akan dibahas bagian penggunaan amplas, apa apa saja saja jeni jeniss-je jeni niss ampl amplas as yang yang seri sering ng digu diguna naka kan n dala dalam m pros proses es manuf manufact acturi uring ng dan kelebi kelebihan han apa saja saja yang yang didapa didapatka tkan n dalam dalam proses proses pengamplasan.
1.2 Maksud Maksud dan dan Tu Tujuan juan
Setelah melakukan praktikum, Mahasiswa diharapkan dapat: . Memaha Memahami mi berb berbaga agaii jenis jenis amp amplas las.. !. Memahami Memahami "ara mengamplas mengamplas yang baik dan aman. #. Memaha Memahami mi keguna kegunaan an amplas amplas..
1.3 Gamar Gamar Alat dan dan Mes!n Mes!n
1
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1. Mes!n Finishing Sander
Mesin finishing g sander Gamar 1.1Mesin finishin 2. Mes!n Random Orbital Sander
Gamar 1.2 Mesin rabdom orbital sander
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Gamar 1.3 Mesin belt sander
". Am#l Am#las as Le Lem mara aran n
Gamar 1." $mplas lembaran
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Gamar 1.$ $mplas gulungan
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BAB II LANDA%AN TE&'I
2.1 Te(r! Dasar
$mpl $mplas as benda kerja
ber% ber%un ungs gsii
dengan
"ara
untu untuk k
meng mengik ikis is&m &men engh ghal alus uska kan n
digosokkan.
'alus
dan
perm permuk ukaaa aaan n
kasarnya
kertas
ampl amplas as ditu ditunj njuk ukka kan n oleh oleh angk angkaa yang yang ter" ter"an antu tum m diba dibali lik k kert kertas as ampl amplas as tersebut. Semakin besar angka yang tertulis menunjukkan semakin halus dan rapat susunan
pasir
amplas
tersebut.
Pada
pekerjaan
perbaikan
dan dan peny penyel eles esai aian an bodi bodi otom otomot oti% i%,, ampl amplas as digu diguna naka kan n untu untuk k meng menggo goso sok k lapisan "at, dempul atau surfacer atau surfacer.. (ara menggunakan amplas manual: Menggunakan masker, karena ketika kita mengamplas akan ada debu
•
dari hasil amplas yang dapat beterbangan dan terhirup paru ) paru. Mengguna Menggunakan kan ka"amata ka"amata safety, sama sama sepe sepert rtii kasu kasuss diat diatas as,, sela selain in
•
terhirup bisa juga terkena mata yang dapat menyebabkan iritasi mata. Mengguna Menggunakan kan bantalan, bantalan, karena karena kertas kertas amplas amplas sangat sangat tipis tipis sehingga sehingga
•
"uku "ukup p suli sulitt untu untuk k di geng gengga gam, m, bias biasan anya ya kita kita meng menggu guna naka kan n busa busa&& sterofoam sterofoam & & sandal bekas yang di potong sesuai genggaman tangan.
2.2 )en!s Am#las Berdasarkan *ungs!n+a *ungs!n+a
*erdasarkan %ungsinya, amplas dikelompokkan dikelompokkan menjadi ! yaitu :
$mplas *esi $tau +ogam
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$mpla $mplass besi besi adalah adalah amplas amplas yang yang digun digunaka akan n untuk untuk merata meratakan kan dan dan menghaluskan sebuah sebuah benda kerja berupa berupa besi atau logam, atau atau kerak-kerak besi. . $mpla $mplass besi besi terb terbuat uat dari dari bak baku u silicon carbide. carbide. !. Pada amplas amplas besi terdapat terdapat nomor nomor,, nomor nomor tersebut tersebut berkisar berkisar dari dari angka angka sampai #, yang menandakan tingkat kehalusan dan kekasaran dari amplas tersebut. (ara memba"anya angka merupakan amplas kasar, dan amplas amplas # # merupa merupakan kan amplas amplas super super halus, halus, adi adi makin makin besar besar nomor nomor yang yang terdap terdapat at pada pada amplas amplas maka maka tingka tingkatt kekasa kekasaran ran amplas amplas tersebut makin halus. #. amu amun n real realit itas as yang yang terj terjad adii dila dilapa pang ngan an,, jeni jeniss angk angkaa yang yang bere bereda dar r biasanya dimulai dari angka sampai , akan sangat jarang sebuah tokoh mensuply sto"k ampals dengan tingkat kehalusan se"ara berurutan, biasanya sebuah toko bangunan atau toko "at yang mempunyai sto"k amplas dengan kelipatan , !, #, /, 0, 1, , 2. Ini merupakan "ontoh ukuran amplas yang dijual dipasaran. /. Kena Kenapa pa ukur ukuran an ampl amplas as berb berbed eda, a, kare karena na part partik ikel el yang yang digu diguna naka kan n berbeda, sesuai dengan kegunaan amplas tersebut. jenis-jenis jenis-jenis amplas yang yang tepa tepatt agar agar peng penggu guna naan anny nyaa tida tidak k mala malah h meru merusa sak k komp kompon onen en kendaraan.
$mplas Kayu $mplas kayu adalah suatu jenis amplas yang digunakan meratakan atau
menghaluskan benda kerja dalam bentuk kayu. enis amplas kayu tidak jauh beda dengan amplas besi atau logam, hanya terletak pada penggunaannya. penggunaannya.
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2.3 )en!s Am#las Berdasarkan Penggunaann+a
*erdasarkan penggunaannya, penggunaannya, amplas dapat dibedakan menjadi ! yaitu : $mplas kering dan amplas basah
$mplas Kering $mpl $mplas as keri kering ng adal adalah ah suat suatu u jeni jeniss ampl amplas as yang yang digu diguna naka kan n untu untuk k
meratan atau menghaluskan menghaluskan benda benda kerja atau panel panel tampa "airan.
$mplas *asah $mpl $mplas as basa basah h adal adalah ah suat suatu u jeni jeniss ampl amplas as yang yang digu diguna naka kan n untu untuk k
merata meratakan kan atau atau mengha menghalus luskan kan benda benda kerja kerja denga dengan n mengg mengguna unakan kan air atau atau spertu spertuss se"ara se"ara bersam bersamaan aan..
Kedua Kedua ampla amplass ini masin masing-m g-masi asing ng memili memiliki ki
keuntungan dan kekurangannya tersendiri. $. Kelebihan dan Kekurangan Kekurangan $mplas $mplas Kering Kering dan $mplas *asah Kedua jenis amplas ini mempunyai keunggulan dan kekurangannya masingmasing, yaitu:
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Kekurangannya Kekurangannya menggunakan kertas amplas kering:
Menimbulkan debu di mana-mana
Suara berisik
Kertas amplas mudah kotor mudah tertutup
'asilnya tidak bisa langsung dilihat
Kelebihan atau keuntungan kertas amplas basah :
3idak menimbulkan debu
Kertas amplas tidak lekas kotor tidak lekas tertutup
'asilnya bisa langsung diliha
Kekurangannya Kekurangannya menggunakan kertas amplas basah:
4aktu pengeringan lebih lama
3empat kerja jadi be"ek
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3erdapat berbagai ma"am amplas berdasarkan material, bentuk, serta kekasa kekasaran rannya nya.. $mplas $mplas merup merupaka akan n salah salah satu satu jenis jenis materi material al abrasi abrasi%% yang yang dibua dibuatt dengan dengan proses proses perlek perlekata atan n 5 coated coated abrasive abrasive6. 6. $mpla mplass terd terdir irii atas atas dua bagian yang disatukan, yaitu material abrasi% dan material backing .
Material Backing Backing $mplas $mplas Mater Materia iall
backi backing ng yang ang
bahan %leksibel, %leksibel,
terbuat
dari
digun gunaka akan kertas,
pada pada
kertas
ampl amplaas
tahan
air,
meru erupak pakan kain,
dan
synthetic fiberglass. fiberglass.
$mpl $mplas as yang yang meng menggu guna naka kan n material material backing backing dari dari baha bahan n kert kertas as tidak dak tahan ahan
air air
seh sehing ingga
hany hanyaa
dapa apat
digu igunak nakan
pad pada
pek pekerj erjaan aan
pengamplasan kering kering (dry-sanding). (dry-sanding). Pemili Pemilihan han pengg pengguna unaan an amplas amplas dengan dengan mate materi rial al ba"k ba"kin ing g dari dari baha bahan n kert kertas as taha tahan n air air, kain kain,, atau ataupu pun n synthetic fiberglass fiberglass dises disesuai uaikan kan dengan dengan kekuat kekuatan, an, %leksi %leksibil bilita itas, s, dan dan kondi kondisi si bidang bidang permukaan benda kerja kerja yang akan dikerjakan. dikerjakan.
Material Abrasif $mplas 3erdapat dua jenis material abrasi% amplas yang umum digunakan pada pekerjaan perbaikan dan penyelesaian bodi otomoti%, yaitu silicon carbide carbide dan dan alumunium oxide.
•
Partikel
abrasi%
yang
terbuat
dari silicon
carbide, carbide,
terp terpe" e"ah ah--
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2.$ Berma,am-ma,am Am#las Mater!al %erta /ekasarann+a
*erdasarkan bentuk, material serta kekasarannya, amplas diklasi%ikasi menjadi beberapa aitem yaitu : a6 Klasi%ik Klasi%ikasi asi *entuk, *entuk, berdasark berdasarkan an bentuknya bentuknya amplas amplas dibedaka dibedakan n menjadi tipe roll dan tipe lembaran. 3ipe 3ipe roll ada yang berbentuk membulat dan ada ada yang yang berb berben entu tuk k empa empatt pers perseg egii panj panjan ang. g. Demi Demiki kian an juga juga tipe tipe lembaran dibedakan dalam bentuk bulat dan empat persegi panjang.
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Gamar 2.2 $mplas tipe lembaran
b6 Klasi%ikasi "ara pemasangan, berdasarkan klasi%ikasinya klasi%ikasinya amplas dibedakan tipe adhesive, adhesive, tipe velcro, velcro, dan tipe non adhisive. "6 Klasi%ik Klasi%ikasi asi material, material, berdasark berdasarkan an materialny materialnyaa perbendaan perbendaan didasarkan didasarkan pada jenis material material belakang dan dan material partikel partikel abrasi%nya. abrasi%nya. *erdasark *erdasarkan an material material belakang ada empat empat jenis, jenis, yaitu yaitu kertas, kertas, kertas kertas tahan air, kain, dan fiberg dan fiberglass. lass. Ditinjau dari material partikel partikel abrasi%nya dibedakan dibedakan ada yang terbuat dari dari silicon carbide, carbide, dan ada yan terbua terbuatt dari oxidi! oxidi!ed ed aluminium. $mplas
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yang relati% relati% keras. $da dua metode yang yang digunakan digunakan dalam melapisi partikel partikel abrasi abrasi8e 8e pada pada materi material al ba"kin ba"king, g, yaitu yaitu metode metode lapisa lapisan n terbu terbuka ka dan lapisa lapisan n tertutup. Pada metode lapisan terbuka, ada jarak yang lebih lebar diantara partikel-pertikel. partikel-pertikel. 'al ini memungkinkan partikel yang diamplas terlepas dari partikel abrasi%, dan men"egah permukaan amplas menjadi ntersumbat. Metode lapisan terbuka ini terutama digunakan untuk pengamplasan kering 5dry-sanding 6. 6. $mplas tipe lapisan tertutup memiliki partikel abrasi% yang dikemas rapat rapat dan digun digunaka akan n terut terutama ama untuk untuk pengam pengampla plasan san basah basah 5 "et sanding sanding 6, 6, dimana tidak ada resiko amplas menjadi tersumbat.
d6 Klasi Klasi%i %ikas kasii 9rit 5kek 5kekera erasan san66 omor grit biasanya di"etak pada bagian belakang amplas. Semakin besar
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sete setellah top "oat Sebelu Sebelum m menggu menggunak nakan an ampla amplas, s, %aktor %aktor yang yang sangat sangat penti penting ng adalah adalah memilih memilih nomor nomor grit yang berpenga berpengaruh ruh pada hasil kerja, dan seberapa lama pekerjaan dilakukan. dilakukan. Sebagai Sebagai "ontoh "ontoh pemboros pemborosan an waktu waktu dan tenaga tenaga akan terjadi, terjadi, apabila amplas dengan kekasaran yang halus, misal ;0 digunakan untuk mengupas "at aslinya, apabila top "oat diaplikasi setelah mengupas permukaan dengan amplas yang memiliki grit ;0, maka tidak akan diperoleh lapisan akhir yang halus, seberapapun lapisan diaplikasikan. diaplikasikan. Dalam praktek tanda yang ditinggalkan oleh amplas dengan grit ;1 tidak dihilangkan dengan mudah oleh grit ;!. oleh sebabitu, yang penting untuk dilakukan adalah berganti pada grit yang lebih halus se"ara bertahap, sehi sehing ngga ga dapa dapatt meng menghi hila lang ngka kan n gore goresa san n yang yang diti ditigg ggal alka kan n oleh oleh ampl amplas as terdahulu.
apli aplika kasi si
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Pilih kertas amplas yang sesuai.
Pegang kertas amplas, jika menggunakan landasan maka sisi kertas amplas harus dipegang rapat landasan jangan menggunakan bahan yang keras 5kayu & besi6.
3ekan kertas amplas se"ukupnya kemudian gerakkan pada permukaan.
Mempersiapkan permukaan kayu yang akan diamplas.
Dalam Dalam memper mempersia siapka pkan n permuk permukaan aan kayu kayu ada bebera beberapa pa hal yang yang perlu perlu diperhatikan, diperhatikan, yaitu: . Kebiasaan aan Prin Prinsi sip p pert pertam amaa dan dan yang yang utam utamaa pada pada pers persia iapa pan n kayu kayu sebelum sebelum %inishi %inishing ng adalah adalah untuk untuk membersih membersihkan kan defect dan dan "a"at "a"at kayu sebersih mungkin. 4alaupun pada kayu akan tetap ada "a"at
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kebanyakan jenis jenis finishing ber%ungsi ber%ungsi untuk mengekspos serat kayu yang
menjadi
nilai
tinggi
dari
kayu
tersebut.
!. Kert Kertas as $mplas plas *eberapa *eberapa jenis jenis amplas amplas dibuat dibuat berdasark berdasarkan an jenis jenis material. material. $da amplas yang khusus dibuat untuk kayu yang keras misalnya. Pilihlah kertas amplas yang tidak mudah rontok. Kebanyakan orang berpikir bahwa apabila menggunakan kertas amplas yang paling halus berarti akan mendapatkan permukaan kayu yang baik pula. Ini tidak tidak benar, benar, lebih lebih baik pengampl pengamplasan asan dilakuka dilakukan n se"ara bertahap bertahap berdasarkan grit grit amplas. Setelah melalui proses mesin atau alat tukang kayu 5ketam, serut dll6, grit amplas pertama yang optimal bisa menggunakan no 1& 1& untuk untuk memotong memotong esrat besar, besar, marking marking mesin dan ujungujungujun ujung g kasa kasarr lain lainny nya. a. Kemu Kemudi dian an dila dilanj njut utka kan n deng dengan an grit grit !, !, !!&!/. Pada le8el ini garis-garis kasar serat sudah tidak terlihat
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diaplika diaplikasika sikan. n. $pabila $pabila pengampl pengamplasan asan dilakuk dilakukan an se"ara manual, manual, sebaiknya gunakan sebatang kayu yang dilapis dengan bahan lebih lunak (softboard) ukuran ukuran sekita sekitarr 1=/ 1=/=! =!mm mm sebaga sebagaii >klos> >klos> amplas. Klos ini akan membantu membuat alur pengamplasan lebih rata rata dan dan data datarr. Sela Selain in itu itu pula pula tang tangan an anda anda terh terhiindar ndar dari dari kemungkin kemungkinan an luka karena goresan. goresan. ika ada bekas lem sebaiknya sebaiknya dibersihkan bersamaan pada waktu perakitan ataupun ketika lem set seteng engah
keri ering.
3eruta rutama ma
pad pada
sud sudut-s t-sudu udut
kontr ontru uksi, si,
pengamplasan perlu dilakukan dengan hati-hati. Setelah itu bersihkan pula debu-debu yang menempel karena pengamplasan dengan alat semprot angin bertekanan atau kain kering yang bersih. Sebisa Sebisa mungki mungkin n bahan bahan %inish %inishin ing g langsu langsung ng diapl diaplika ikasik sikan an begit begitu u benda kerja bersih dari debu. angan menunda terlalu lama karena debu akan kembali menempel dalam beberapa jam.
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Gamar 2.3 Mesin belt sander
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Belt sander merupakan mesin amplas dengan ke"epatan yang sangat sangat tingg tinggii untuk untuk proses proses penger pengerjaa jaan n kayu, kayu, terleb terlebih ih untuk untuk kayu kayu berbidang besar. besar. *elt sander memakai kertas kertas ampelas khusus berbentuk seperti sabuk. Mesin ini sangat agresi% serta berke"epatan tinggi, karena itulah mesin belt sandera bisa mengampelas sesuatu dengan lebih "epat jika dibandingkan dibandingkan dengan dengan mesin ampelas yang yang lainnya.
•
(ara Memasang $mplas Pada mesin Belt mesin Belt #ander . Sebe Sebelu lum m mela melaku kuka kan n pema pemasa sang ngan an,, past pastik ikan anla lah h stek steker er atau atau "olokan pada belt sander tak terhubung pada stop kontak, hal ini bertujuan untuk menghindari terjadinya sesuatu yang tak diha dihara rapk pkan an..
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kuas, dengan melakukan perawatan maka maka belt sander pun bisa bertahan lama. !. Mesin %inishing #ander #ander Mesin amplas ini digunakan untuk mengamplas permukaan benda baik itu kayu atau pun besi. Dengan menggunakan mesin amplas ini kita dapat menghemat waktu dan tenaga saat melakukan proses pengamplasan.
Cara Memasang Kertas Amplas Pada Mesin Amplas (ara (ara pemasa pemasanga ngan n dan dan pengg pengguna unaan an mesin mesin amplas amplas kemung kemungkin kinan an
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disediakan saat membeli mesin, jig ini terdapat bundaran-bundaran tajam yang ber%ungsi untuk melubangi kertas gosok.
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ips Aman Mengamplas Menggunakan Menggunakan Mesin Amplas •
Kita Kita
haru haruss meng mengut utam amak akan an
kese kesela lama mata tan n
deng dengan an
meng menggu guna naka kan n
setidaknya dua alat sa%ety seperti masker dan ka"amata. Setelah itu kertas ampl amplas as khus khusus us 5rek 5rekom omen enda dasi si kami kami adal adalah ah kert kertas as ampl amplas as toho toho66 di pasangkan pada mesin amplas atau atau finishing sander . +alu pasang +alu pasang power, dan nyalakan. •
Mesin di pegang dengan diatur tekanan pada permukaan yang akan dihaluskan hingga dirasa "ukup halus. 3idak lupa selalu mulai lah dengan ukuran ukuran amplas amplas yang yang kasar kasar untuk untuk memper memper"ep "epat at proses proses lalu lalu kemudi kemudian an
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$mplas kayu adalah proses finishing proses finishing yag penting,karena sebelum benda diamplas pasti memiliki sisi atau bagian yang kasar, maka agar nyaman dipegang atau digunakan bagian tersebut harus diamplas.
3.$ Gamar Benda /erja
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BAB I4
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d. Selanjutny Selanjutnyaa masukkanlah masukkanlah amplas ke mesin, mesin, kemudia kemudian n kembalikka kembalikkan n tuas pengun"inya untuk mengun"i. e. Puta Putarl rlah ah knob knob peny penyet etel el yang ang ada ada pada pada mesi mesin n untu untuk k meng mengat atur ur keken"angan kertas ampelas. %. 3ekan ekan atau tarikla tariklah h sakat untuk untuk menghid menghiduka ukan n mesin. mesin. 9unakanl 9unakanlah ah kedua tangan $nda ketika memakai belt sander sebab putaran yang dihasilkan dari mesin tersebut "ukup tinggi.
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Kelebihan atau keuntungan kertas amplas basah :
3idak menimbulkan debu Kertas amplas tidak lekas kotor tidak lekas tertutup 'asilnya bisa langsung dilihat Kekurangannya menggunakan kertas amplas basah:
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