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Menggambar Teknik Oleh: Ekoyanto Pudjiono. Menggambar Teknik pendahuluan peralatan meja gambar kertas gambar kepala gambar standar skala standar huruf.

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Presentasi berjudul: "Menggambar Teknik Oleh: Ekoyanto Pudjiono. Menggambar Teknik pendahuluan peralatan meja gambar kertas gambar kepala gambar standar skala standar huruf."— Transcript presentasi:

1 Menggambar Teknik Oleh: Ekoyanto Pudjiono

2 Menggambar Teknik pendahuluan peralatan meja gambar kertas gambar kepala gambar standar skala standar huruf standar garis Menyiapkan gambar Line thickness & types Dimensioning & Leterring Tolerancing The lay out of drawing Orthographic projection Sectioning - introduction Hatching Drawing threaded parts Assembly drawings Dimensioning: parallel dll Dimensioning: by coordinate Dimensioning small features Dimensioning holes Dimensioning radii Sectioning in a single plane Sectioning in two planes Half sectional view Part sectional view Which sectional view? Hatching adjacent objects Hatching thin materials Hatching large areas STOP? Dimensioning circles

3 Gambar teknik •Sarana komunikasi dalam proses merancang dan mengkonstruksi benda •Harus dapat menunjukkan bentuk serta ukuran benda •Harus memenuhi aturan-aturan standar. KEMBALI KE ATAS

4 Perancang dan Pengkonstruksi •Perancang –menuangkan ide kedalam bentuk gambar. •Pengkonstruksi –mengerjakan benda dengan pedoman gambar. •Perancang dan pengkonstruksi –harus menguasai dasar dan aturan standar yang digunakan dalam gambar teknik KEMBALI KE ATAS

5 Peralatan menggambar 1.Meja gambar 2.Mistar gambar panjang 3.Mistar gambar segitiga 4.Pensil 5.Karet penghapus 6.Jangka 7.Busur derajad 8.Rapidograph 9.Mal gambar dan huruf 10.Plester (designer adhesive) 11.Kertas gambar (terdapat beberapa macam) KEMBALI KE ATAS

6 Syarat meja gambar 1.Umumnya terbuat dari kayu yang berserat halus 2.Permukaannya rata, halus, dan licin 3.Tidak terlalu keras atau lunak 4.Sisi kiri dan atas daun meja rata dan halus untuk menggeser-geser mistar gambar 5.Posisi daun meja sedikit menurun (condong) untuk mencegah kelelahan 6.Ukuran meja disesuaikan dengan ukuran kertas KEMBALI KE ATAS

7 Ukuran meja gambar Ukuran kertasUkuran meja, mm 2 A0A0 950 x 1270 A1A1 650 x 920 A2A2 470 x 650 A3A3 336 x 470 KEMBALI KE ATAS

8 Mistar gambar panjang •Digunakan bila tidak ada mesin gambar atau draughfting machine •Untuk menarik garis-garis panjang horisontal •(garis-garis vertikal atau menyudut dibuat dengan bantuan segitiga gambar) •Terbuat dari kayu tahan bengkokan dan tidak berubah bentuk •Terdiri atas daun mistar dan kepala mistar yang menyilang membentuk sudut 90  pada salah satu ujungnya •Panjangnya minimum sama dengan panjang papan gambar •Kepala mistar ditekan menempel pada sisi kiri papan gambar KEMBALI KE ATAS

9 Mistar gambar segitiga •Untuk menarik garis-garis –horisontal, vertikal, dan miring •Terbuat dari plastik transparan –agar garis-garis gambar di bawahnya dapat terlihat •Pilih yang –Keras, benar-benar lurus, dan tidak mudah rusak •Terdapat dua jenis –kombinasi sudut 90 , 30  dan 60  –kombinasi sudut 90 , 45  dan 45  KEMBALI KE ATAS

10 Pensil •Tingkat kekerasan pensil (Black, Firm, Hard): –lunak (4B, 3B, 2B, B) –sedang (HB, F) –keras (H s/d 9H) •Gambar teknik menggunakan –H dan 2 H •Pensil mekanik isinya dapat diganti –menjamin ketebalan garis yang seragam. •Ukuran isi pensil mekanik –0,25, 0,35, 0,5 dan 0,7 KEMBALI KE ATAS

11 Karet penghapus •Jenis karet penghapus –Karet lunak untuk menghapus garis gambar pensil –Karet tinta untuk menghapus garis gambar tinta •Gerakan cepat dan tekanan kuat –menimbulkan noda pada kertas karena panas akibat gesekan •Kotoran bekas karet penghapus –dihilangkan dengan sikat khusus KEMBALI KE ATAS

12 Jangka •Berguna untuk menggambar –lingkaran –membagi garis –membagi sudut •Memiliki dua kaki untuk pensil dan untuk jarum •Pensil jangan diruncingkan tetapi diasah miring –untuk memperoleh ketebalan garis busur yang sama •Jangka pegas dengan sekrup penyetel di tengah –berguna untuk membuat lingkaran berdiameter kecil •Penggunaan jangka –dianjurkan berputar searah dengan putaran jarum jam –tekanan lebih diarahkan pada bagian kaki jarum sebagai sumbu putaran KEMBALI KE ATAS

13 Busur derajad •Untuk membuat dan membagi sudut •Terbuat dari mika •Garis-garis pembagi sudut –0  sampai dengan 180 , atau –0  sampai dengan 360  KEMBALI KE ATAS

14 Rapidograph •Berguna untuk membuat gambar dengan tinta –biasanya di atas kertas kalkir untuk diperbanyak •Ukuran pena sesuai dengan tebal garis –0,25, 0,35, 0,5, 07. •Bila tidak digunakan ujung pena harus ditutup –untuk menghindari kerusakan dari benturan •Bila tinta tidak bisa keluar perlu dicuci –dengan air hangat •Saat menarik garis harus –rapido tegak lurus dan tidak ditekan –tidak boleh terlalu cepat agar ketebalannya seragam KEMBALI KE ATAS

15 Mal gambar dan mal huruf •Berguna untuk membuat gambar dan huruf –dengan cepat dan bentuk yang lebih rapi •Mal bentuk bulatan –untuk membuat lingkaran dan setengah lingkaran, terutama yang berdiameter kecil •Mal lengkung –untuk membuat garis-garis lengkung yang sulit dikerjakan dengan jangka KEMBALI KE ATAS

16 Plester (designer adhesive) •Berguna untuk menempelkan kertas gambar di atas papan meja –agar posisinya tidak bergeser •Terdapat jenis plester khusus –tidak meninggalkan bekas lengket atau kotoran pada kertas –jangan menggunakan paku jamur KEMBALI KE ATAS

17 Kertas gambar 1.Kertas sketsa atau bagan (kertas milimeter) –putih tebal bergaris vertikal dan horisontal berjarak 10 mm x 10 mm –untuk membuat sketsa gambar sementara 2.Kertas putih tebal –untuk membuat gambar kerja dengan skala sebenarnya 3.Kertas kalkir –kertas transparan dengan berbagai ukuran ketebalan (dinyatakan dalam gram) –untuk membuat gambar dengan tinta untuk keperluan reproduksi KEMBALI KE ATAS

18 Standar ukuran kertas •Warna kertas gambar adalah putih •Ukuran dasar kertas gambar 1 m 2 dengan perbandingan sisi- sisinya 1:  2 •Kadang tepi kiri disisakan untuk penjilidan shg jarak garis tepi kiri lebih besar, misalnya 20 mm Ukuran standar AUkuran kertas, mmJarak garis tepi, mm A0841 x A1594 x A2420 x A3297 x A4210 x 2975 KEMBALI KE ATAS

19 Kepala gambar •terletak di bagian sudut kanan bawah •memberikan keterangan tentang gambar yang dibuat •berisi informasi-informasi KEMBALI KE ATAS

20 Informasi dlm kepala gambar 1.Simbol proyeksi: menunjukkan sistem proyeksi yg digunakan –sistem proyeksi Amerika  kerucut terpancung di sebelah kanan lingkaran –sistem proyeksi Eropa  kerucut terpancung di sebelah kiri lingkaran 2.Skala: harus ditulis meskipun skalanya 1:1 3.Satuan: untuk sistem Internasional digunakan satuan mm (milimeter) 4.Digambar: nama penggambar memudahkan bila ada pertanyaan harus kepada siapa 5.Diperiksa: gambar perlu diperiksa dan ditandatangani oleh atasan atau kepala bagian 6.Tanggal: memudahkan dokumentasi dan urutan perkembangan bila terjadi perubahan gambar 7.Jurusan/NIM: identitas pembuat gambar perlu dicantumkan untuk mengetahui dari bagian mana 8.Keterangan: berisi peringatan-peringatan yang terkait dengan masalah gambar 9.Nama: mencakup Nama Institusi, Judul Gambar, Ukuran Kertas, Nomor Urut Gambar 10.Nama bagian-bagian benda: Kalau benda yang digambar merupakan susunan bagian-bagian maka perlu dicantumkan nama bagian-bagian beserta jumlah, bahan dan normalisasi yang ada KEMBALI KE ATAS

21 Kepala gambar NO. BAGIAN JUM LAH NAMABAHANNORMALISASIKETERANGAN PROYEKSI SKALA :DIGAMBAR : EKOYANTO KETERANGAN SATUAN : mmNIM/JURUSAN: TANGGAL:DILIHAT : JUR. TEK. PERT.BAUT0501A4 KEMBALI KE ATAS

22 TUGAS 1: KEPALA GAMBAR •Buatlah kepala gambar dgn ketentuan sbb: –Dibuat pada kertas A4 –Diberi garis tepi –Diberi simbol proyeksi –Diberi judul gambar –Diberi identitas lengkap mhs –Mengandung kolom nama bagian-bagian benda •Kriteria penilaian: –Kelengkapan informasi yg diberikan –Kebenaran ukuran garis –Kualitas garis: ketebalan seragam, bersih, hitam –Kerapian pemotongan kertas KEMBALI KE ATAS

23 Standardisasi ukuran: Skala Huruf Garis KEMBALI KE ATAS

24 Standar skala (memperkecil dan memperbesar gambar) Gambar elemen mesin Skala diperkecilSkala diperbesar 1:22:1 1:33:1 1:55:1 1:1010:1 1:2,5 (kadang-kadang)2,5:1 KEMBALI KE ATAS

25 Skala yang biasa dipakai di berbagai bidang Gambar Mesin Gambar SipilGambar Arsitek 1:2,51:251:1001:6001: :11:251:250 1:51:501:2001:6251: :21:501:300 1:101:801:3001:7501: :51:1001:400 1:151:1001:4001: : :101:1251:500 1:201:5001: :201:200 KEMBALI KE ATAS

26 Standar Huruf dan Angka (tipe dan tebalnya) •Tipe huruf –Tegak (biasa digunakan) –Miring 75  •Ketebalan huruf –Tipis (A): 1/14 h –Tebal (B): 1/10 h (h = tinggi huruf) •Contoh perbandingan tebal dan tinggi Tinggi huruf, mm2,53, Tebal huruf (tipe A), mm0,180,250,350,50,711,4 Tebal huruf (tipe B), mm0,250,350,50,711,42 KEMBALI KE ATAS

27 Jarak huruf I S O 8 1 e j A M R f UkuranTipe ATipe B Tinggi huruf besar (h)14/14 h10/10 h Tinggi huruf kecil (c)10/14 h7/10 h Jarak antar huruf (a) 2/14 h2/10 h Jarak antar kata (e) 6/14 h6/10 h Jarak antar baris (b)22/14 h16/10 h a e d h b ch KEMBALI KE ATAS

28 Contoh ukuran huruf •Tinggi, jarak, tebal (dalam mm) Tinggi huruf3, Tinggi huruf kecil2,53,55710 Jarak antar huruf0,711,422,8 Jarak antar kata2,734,268,4 Jarak antar baris Tebal huruf (tipe A)0,2 5 0,3 5 0,50,71 Tebal huruf (tipe B)0,3 5 0,50,711,4 KEMBALI KE ATAS

29 Bentuk huruf besar miring & tegak 1.I T L E F H N Z 2.X A V M W K Y 3.O Q C G D U J P 4.R B S & 1.I T L E F H N Z 2.X A V M W K Y 3.O Q C G D U J P 4.R B S & KEMBALI KE ATAS

30 Dominasi garis (pada masing-masing grup huruf) GrupMiringtegak 1horisontal, miringhorisontal, vert 2diagonal 3elipslingkaran 4horisontal, elipsmiring, lingk KEMBALI KE ATAS

31 Huruf kecil: miring dan tegak i l k t v w x z o a b d p q g c e h n r m u y j f s i l k t v w x z o a b d p q g c e h n r m u y j f s KEMBALI KE ATAS

32 Angka miring dan tegak KEMBALI KE ATAS

33 Proporsi •Tinggi huruf besar: 6 satuan •Lebar –T = 6 satuan –L = 5 satuan –E •Bagian tengah = 3,5 satuan (terletak sedikit keatas) •Bagian bawah = 5 satuan •Bagian atas = 0,5 satuan < bagian bawah •Tinggi huruf kecil –i = 4 satuan; posisi titik pd satuan ke-5 –k & l = 6 satuan –t = 5 satuan; posisi batang melintang pd satuan ke-4 –lainnya = 4 satuan KEMBALI KE ATAS

34 Tugas 2: Standar huruf •Tuliskan beberapa kalimat (bisa syair lagu), dgn ketentuan: –Sedikit-dikitnya satu baris untuk jenis huruf: (a) besar tegak, (b) besar miring, (c) kecil tegak, dan (d) kecil miring. –Pada kertas A4 –Diberi kepala gambar lengkap dan garis tepi •Kriteria penilaian: –Kelengkapan komposisi tulisan dan angka –Kelengkapan informasi pada kepala gambar –Keseimbangan proporsi tulisan dan ruang gambar –Konsistensi dan ketaat-asasan (standar) bentuk tulisan –Kualitas tulisan: kerapian, kebersihan, dan ketebalan huruf KEMBALI KE ATAS

35 Standardisasi ukuran: Garis KEMBALI KE ATAS

36 Standar garis (warna hitam seragam, tebal seragam) Contoh garisJenis garisGuna garis Tebal garis A 4, A 3, A 2 A 1, A 0 A tebal, lurus1. grs gambar yang tampak, 2. grs tepi 0,50,7 B tipis, lurus1.grs bantu, 2.grs ukur, 3.grs arsir, 4.grs gambar disederhanakan, 5.grs ulir 0,250,35 C tipis, bebas1. penunjukan grs batas gbr yg dihilangkan sebagian 0,250,35 D tipis, gores titik 1.grs sumbu, 2.lingkar jarak, 3. batas maksimum gerakan benda 0,250,35 E tipis, gores1. menunjukkan benda yg tak tampak/terhalang bidang lain 0,350,5 F tipis, gores titik, kedua ujung tebal 1. menunjukkan tanda dan arah pemotongan 0,5 & 0,250,7 & 0,35 G tebal, gores titik 1. menunjukkan permukaan yg hrs memenuhi persyaratan khusus 0,50,7 KEMBALI KE ATAS

37 Pertemuan antara garis garis tegak dan datar •Penuh dgn penuh •Penuh dgn gores •Gores dgn gores •Garis sumbu dgn garis sumbu •Garis sumbu dgn lingkar jarak KEMBALI KE ATAS

38 Garis penuh dgn garis penuh salahsalahbenar KEMBALI KE ATAS

39 Garis penuh dengan garis gores salahbenar KEMBALI KE ATAS

40 Garis gores dgn garis gores salahsalahbenar KEMBALI KE ATAS

41 Garis sumbu dgn garis sumbu salahbenar KEMBALI KE ATAS

42 Garis sumbu dgn garis sumbu salah benar KEMBALI KE ATAS

43 Garis sumbu dgn lingkar jarak (dari pusat lingkaran) salahbenar KEMBALI KE ATAS

44 MENYIAPKAN GAMBAR TEKNIK ANDA  Rencanakan penggunaan ruang gambar sebaik mungkin.  Berapa jumlah pandangan yang akan digambar.  Seberapa banyak ruang gambar yang akan digunakan.  Usahakan ruang gambar dimanfaatkan semaksimum mungkin.  Pandangan yang banyak detail digambar sebesar mungkin, kalau perlu pada lembaran terpisah.  Sisakan ruang untuk pemberian dimensi.  Rencanakan urutan penggambaran agar tinta basah tdk terkena penggaris. KEMBALI KE ATAS

45 STANDAR GARIS  Garis tidak hanya sekedar menunjukkan bentuk benda  Di dalam gambar teknik perlu memilih jenis garis yang tepat KEMBALI KE ATAS

46 Line Thickness  Most engineering drawings you will require two thickness', a thick and thin line.  The general recommendation are that thick lines are twice as thick as thin lines. A thick continuous line is used for visible edges and outlines. A thin line is used for hatching, leader lines, short centre lines, dimensions and projections. KEMBALI KE ATAS

47 Line Styles Other line styles are used to clarify important features on drawings  Thin chain lines are used to indicate centre lines.  Centre lines are used to identify the centre of a circle, cylindrical features, or a line of symmetry.  Dashed lines are used to show important hidden detail for example wall thickness and holes. KEMBALI KE ATAS

48 Dimensioning  A dimensioned drawing provide all the information necessary for a finished product to be manufactured.  Dimensions are always drawn using continuous thin lines.  Two projection lines indicate where the dimension starts and finishes.  Projection lines do not touch the object and are drawn perpendicular to the element you are dimensioning  Units can be omitted from dimensions if a statement of the units is included on drawing.  The general convention is to dimension in mm's.  All dimensions less than 1 should have a leading zero. i.e..35 should be written as KEMBALI KE ATAS

49 Lettering  All notes and dimensions should be clear and easy to read.  In general all notes should be written in capital letters to aid legibility.  All lettering should be of the same size and preferably no smaller than 3mm.  An example typeface is shown below. KEMBALI KE ATAS

50 Parallel Dimensioning  consists of several dimensions  originating from one projection line. Superimposed Running Dimensions  Superimposed running dimensioning simplifies parallel dimensions in order to reduce the space used on a drawing.  The common origin for the dimension lines is indicated by a small circle at the intersection of the first dimension and the projection line.  In general all other dimension lines are broken.  The dimension note can appear above the dimension line or in- line with the projection line Chain Dimensioning  only be used if the function of the object won't be affected by the accumulation of the tolerances.  A tolerance is an indication of the accuracy the product has to be made to. Combined Dimensions  uses both chain and parallel dimensioning. KEMBALI KE ATAS

51 Dimensioning by Co-ordinates  Two sets of superimposed running dimensions running at right angles can be used with any features which need their centre points defined, such as holes. Simplified dimensioning by co-ordinates  It is also possible to simplify co-ordinate dimensions by using a table to identify features and positions. KEMBALI KE ATAS

52 Dimensioning Small Features  When dimensioning small features, placing the dimension arrow between projection lines may create a drawing which is difficult to read.  In order to clarify dimensions on small features any of the above methods can be used. KEMBALI KE ATAS

53 DIMENSIONING CIRCLES All dimensions of circles are proceeded by this symbol Ø (a)dimensions the circle between two lines projected from two diametrically opposite points.  is used when the circle is too small  a leader line is used to display the dimension. (b) dimensions the circle internally. (c) dimensions the circle from outside the circle using an arrow which points directly towards the centre of the circle. KEMBALI KE ATAS

54 Dimensioning Holes  When dimensioning holes the method of manufacture is not specified unless they necessary for the function of the product.  The word hole doesn't have to be added unless it is considered necessary.  The depth of the hole is usually indicated if it isn't indicated on another view.  The depth of the hole refers to the depth of the cylindrical portion of the hole and not the bit of the hole caused by the tip of the drip. KEMBALI KE ATAS

55 Dimensioning Radii All radial dimensions are proceeded by the capital R. All dimension arrows and lines should be drawn perpendicular to the radius so that the line passes through the centre of the arc. All dimensions should only have one arrowhead which should point to the line being dimensioned. There are two methods for dimensioning radii. (a) shows a radius dimensioned with the centre of the radius located on the drawing. (b) shows how to dimension radii which do not need their centres locating. Spherical dimensions The radius of a spherical surface (i.e. the top of a drawing pin) when dimensioned should have an SR before the size to indicate the type of surface. KEMBALI KE ATAS

56 Tolerancing  It is not possible in practice to manufacture products to the exact figures displayed on an engineering drawing.  The accuracy depends largely on the manufacturing process used and the care taken to manufacture a product.  A tolerance value shows the manufacturing department the maximum permissible variation from the dimension.  Each dimension on a drawing must include a tolerance value.  This can appear either as:  a general tolerance value applicable to several dimensions. i.e. a note specifying that the General Tolerance +/- 0.5 mm.  or a tolerance specific to that dimension  The method of expressing a tolerance on a dimension as recommended by the British standards is shown above.  Note the larger size limit is placed above the lower limit.  All tolerances should be expressed to the appropriate number to the decimal points for the degree of accuracy intended from manufacturing, even if the value is limit is a zero for example.  should not be expressed as 44.8 KEMBALI KE ATAS

57 The layout of an engineering drawing All engineering drawings should feature an information box. Common information recorded on an engineering drawing TITLE: The title of the drawing. NAME: The name of the person who produced the drawing. CHECKED: In many engineering firms, drawings are checked by a second person before they are sent to manufacture, so that any potential problems can be identified early. VERSION: Giving each drawing a version number helps people identify if they are using the most recent version of the drawing. DATE: The date the drawing was created or amended on. SCALE: The scale of the drawing. PROJECTION SYSTEM: The projection system used to create the drawing should be identified to help people read the drawing. COMPANY NAME: Many CAD drawings may be distributed outside the company so the company name is usually added to identify the source. KEMBALI KE ATAS

58 Orthographic projection  The aim of an engineering drawing is to convey all the necessary information of how to make the part to the manufacturing department.  For most parts, the information cannot be conveyed in a single view.  Several views can be combined on a single drawing using one of the two available projection systems, first angle, and third angle projection. KEMBALI KE ATAS

59 Sectioning - Introduction  Sections and sectional views are used to show hidden detail more clearly.  They are created by using a cutting plane to cut the object.  A section is a view of no thickness and shows the outline of the object at the cutting plane.  Visible outlines beyond the cutting plane are not drawn.  A sectional view, displays the outline of the cutting plane and all visible outlines which can be seen beyond the cutting plane.  The diagram below shows a sectional view, and how a cutting plane works. KEMBALI KE ATAS

60 Types of sectioning Sectional View in a single plane  The example shows a simple single plane sectional view where object is cut in half by the cutting plane.  The cutting plane is indicated on a drawing using the line style used for centre lines, but with a thick line indicating the end of lines and any change in the direction of the cutting plane.  The direction of the view is indicated by arrows with a reference letter.  The example below shows a sectional view of the cutting plane A - A. KEMBALI KE ATAS

61 Types of sectioning Sectional View in two planes  It is possible for the cutting plane to change directions, to minimise on the number of sectional views required to capture the necessary detail.  The example shows a pipe being cut by two parallel planes.  The sketch shows where the object is cut. KEMBALI KE ATAS

62 Types of sectioning Half Sectional views  Half sections are commonly used to show both the internal and outside view of symmetrical objects. KEMBALI KE ATAS

63 Types of sectioning Part Sectional views  It is common practice to section a part of an object when only small areas need to be sectioned to indicate the important details.  The example shows a part sectional view to indicate a through-hole in a plate.  Notice that the line indicating the end of the section is a thin continuous line. KEMBALI KE ATAS

64 Which Sectional View?  Consider the diagrams and select the correct sectional view. KEMBALI KE ATAS

65 Hatching  On sections and sectional views solid area should be hatched to indicate this fact.  Hatching is drawn with: 1.a thin continuous line, 2.equally spaced (preferably about 4mm apart, though never less than 1mm) 3.preferably at an angle of 45 degrees. Hatching a single object  When you are hatching an object, but the objects has areas that are separated, all areas of the object should be hatched in the same direction and with the same spacing. KEMBALI KE ATAS

66 Hatching Hatching Adjacent objects  When hatching assembled parts, the direction of the hatching should ideally be REVERSED on adjacent parts.  If more than two parts are adjacent, then the hatching should be STAGGERED to emphasise the fact that these parts are separate. KEMBALI KE ATAS

67 Hatching Hatching thin materials  Sometimes, it is difficult to hatch very thin sections. To emphasise solid wall the walls can be filled in.  This should only be used when the wall thickness size is less than 1mm KEMBALI KE ATAS

68 Hatching Hatching large areas  When hatching large areas in order to aid readabilty, the hatching can be limited to the area near the edges of the part. KEMBALI KE ATAS

69 Drawing threaded parts Drawing Conventions  Threads are drawn with thin lines as shown in this illustration.  When drawn from end-on, a threaded section is indicated by a broken circle drawn using a thin line. KEMBALI KE ATAS

70 Drawing threaded parts  Frequently a threaded section will need to be shown inside a part. 1.The hidden detail is drawn as a thin dashed line. 2.The sectional view uses both thick and thin line with the hatching carrying on to the very edges of the object. KEMBALI KE ATAS

71 Assembly Drawings Features of an assembly drawing  Dimensions 1.Detailed dimensions are excluded from assembly drawings. 2.But overall dimensions of the assembled object are usually indicated. 3.If the spatial relationship between parts if important for the product to function correctly then these should also be indicated on the drawing. For example idicating the maximum and minimum clearance between two parts.  Internal Parts 1.If there are internal assemblies, sectional views should be used.  Parts list 1.Each part is given a unique number, indicated on the drawing by a circle with the number in it and a leader line pointing to the part. 2.The leader line terminates in an arrow if the line touches the edge of the component, or in a circle if the line terminates inside the part. 3.A table of parts should be added to the drawing to identify each part, an example of a parts list is shown below: 4.Item No.DescriptionQtyMaterialRemarks The first three items; Item No., Description, and Quantity should be completed for every distint part on your drawing. (i.e. the number of duplicate parts are recorded in the quantity). The material is used for components that are being made within the company. The Remarks column is useful for specifying a manufacturers part number when using bough-in parts. KEMBALI KE ATAS

72 TERIMA KASIH KEMBALI KE ATAS


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