dasar-dasar menggambar tiga dimensi (3d) dengan
TRANSCRIPT
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DASAR-DASAR MENGGAMBAR TIGA DIMENSI (3D) DENGAN CAD
Sistem Koordinat 3D Pembuatan Obyek Solid Standar Solid Editing (Operasi Boolean)
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Tujuan Instruksional
Mahasiswa menguasai dasar-dasar pembuatan gambar tiga dimensi
(piktorial) dengan bantuan komputer (CAD) dan mempraktekkannya.
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Sistem Koordinat 3D
Koordinat Kartesius 3D (3D Cartesian Coordinate System)
Koordinat Polar Silinder (Cylindrical Polar Coordinate System)
Koordinat Polar Bola (Spherical Polar Coordinate System)
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Koordinat Kartesius 3D
Diformulasikan dalam bentuk (X, Y, Z).
Sumbu X mewakili bidang horisontal, sumbu Y mewakili bidang vertikal, dan sumbu Z mewakili bidang tegak (level)
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Koordinat Polar Silinder Diformulasikan dalam
bentuk (jarak<sudut,ketinggian).
Pola @jarak<sudut sama dengan koordinat polar 2D hanya ditambahkan ketinggian sebagai ketinggian dari titik yang akan dibuat mengikuti arah sumbu Z.
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Koordinat Polar Bola
Diformulasikan dalam bentuk (jarak<sudut<sudut ketinggian)
Pola jarak<sudut sama dengan koordinat polar 2D hanya ditambahkan sudut ketinggian sebagai pembentuk ketinggian titik yang akan dibentuk berdasarkan kemiringan sudut titik asal.
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Bentuk Dasar 3D
Polysolid Box Wedge Cone Cylinder Torus Pyramid
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Command: Polysolid Height = 4.0000, Width = 0.2500, Justification = CenterSpecify start point or [Object/Height/Width/Justify] <Object>: hSpecify height <4.0000>: 300Height = 300.0000, Width = 0.2500, Justification = CenterSpecify start point or [Object/Height/Width/Justify] <Object>: wSpecify width <0.2500>: 15Height = 300.0000, Width = 15.0000, Justification = CenterSpecify start point or [Object/Height/Width/Justify] <Object>: 0,0Specify next point or [Arc/Undo]: @300,0Specify next point or [Arc/Undo]: @0,300Specify next point or [Arc/Close/Undo]: @300,0Specify next point or [Arc/Close/Undo]: @0,-300Specify next point or [Arc/Close/Undo]: @300,0Specify next point or [Arc/Close/Undo]:
Command: Polysolid Height = 4.0000, Width = 0.2500, Justification = CenterSpecify start point or [Object/Height/Width/Justify] <Object>: hSpecify height <4.0000>: 300Height = 300.0000, Width = 0.2500, Justification = CenterSpecify start point or [Object/Height/Width/Justify] <Object>: wSpecify width <0.2500>: 15Height = 300.0000, Width = 15.0000, Justification = CenterSpecify start point or [Object/Height/Width/Justify] <Object>: 0,0Specify next point or [Arc/Undo]: @300,0Specify next point or [Arc/Undo]: @0,300Specify next point or [Arc/Close/Undo]: @300,0Specify next point or [Arc/Close/Undo]: @0,-300Specify next point or [Arc/Close/Undo]: @300,0Specify next point or [Arc/Close/Undo]:
PolysolidPolysolid
t.1
t.2
t.5t.6
height
width
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BoxCommand: boxSpecify first corner or [Center]: 10,10,10Specify other corner or [Cube/Length]: @30,20Specify height or [2Point]: 40
40
2030
(10,10,10)
Bidang XY
XY
Z
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Cylinder
Command: cylinderSpecify center point of base or [3P/2P/Ttr/Elliptical]: 100,100Specify base radius or [Diameter]: 40Specify height or [2Point/Axis endpoint] <40.0000>: 60
R
Bidang XY
center point
height
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WedgeCommand: wedgeSpecify first corner or [Center]: 20,20Specify other corner or [Cube/Length]: @50,20Specify height or [2Point] <60.0000>: 80
80
2050
XY
height
first corner
secondcorner
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Cone
Command: coneSpecify center point of base or [3P/2P/Ttr/Elliptical]: 20,20Specify base radius or [Diameter] <40.0000>: 40Specify height or [2Point/Axis endpoint/Top radius] <50.0000>: 60
R
Bidang XY
center point
height
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Sphere
R
center point
Command: sphereSpecify center point or [3P/2P/Ttr]: 20,20Specify radius or [Diameter] <40.0000>: 40
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Latihan 1
Buatlah model 3D dengan box dan wedge
20 20
60
60
20
10
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Extrude
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Revolve
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Slice Command: sliceSelect objects to slice: (klik object)Select objects to slice:Specify start point of slicing plane or [planar Object/Surface/Zaxis/View/XY/YZ/ZX/3points] <3points>: 3pSpecify first point on plane: (klik t.1)Specify second point on plane: (klik t.2)Specify third point on plane: (klik t.3)Specify a point on desired side or [keep Both sides] <Both>: (klik t.4)
t.3
t.2
t.1
t.4
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SliceCommand: sliceSelect objects to slice: 1 foundSelect objects to slice: (klik object)Specify start point of slicing plane or [planar Object/Surface/Zaxis/View/XY/YZ/ZX/3points] <3points>: xySpecify a point on the XY-plane <0,0,0>: (klik t.1)Specify a point on desired side or [keep Both sides] <Both>: (klik t.2)
t.1 t.
2
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SectionCommand: sectionSelect objects: (klik object)Select objects:Specify first point on Section plane by [Object/Zaxis/View/XY/YZ/ZX/3points] <3points>: xySpecify a point on the XY-plane <0,0,0>: (klik t.1)
t.1
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Solid Editing
Union Subtract Intersect
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UnionCommand: unionSelect objects: (klik t.1) Select objects: (klik t.2)Select objects: (enter)
t.2
t.1
Model tergabung menjadi satu unit (objek)
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SubtractCommand: subtractSelect solids and regions to subtract from ..Select objects: (klik object 1)Select objects: (enter)Select solids and regions to subtract ..Select objects: (klik object 2)Select objects: (enter)
t.2
t.1
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Intersect
Command: intersectSelect objects: (klik object 1)Select objects: (klik object 2)Select objects: (enter)
t.2
t.1
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CopyCommand: copySelect objects: (klik object 1)Select objects: (enter)Current settings: Copy mode = MultipleSpecify base point or [Displacement/mOde] <Displacement>: (klik t.1)Specify second point or <use first point as displacement>: (klik t.2)Specify second point or [Exit/Undo] <Exit>:
t.1
t.2
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Mengganti arah sistem koordinat (UCS)
Command: ucsCurrent ucs name: *WORLD*Specify origin of UCS or [Face/NAmed/OBject/Previous/View/World/X/Y/Z/ZAxis] <World>: (klik t.1)Specify point on X-axis or <Accept>: (klik X axis)Specify point on the XY plane or <Accept>: (klik Y axis yang dikehendaki)
t.1
Bidang XY
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Latihan 2 Gambar model 3D dengan gambar 2D di-extrude, model dasar silinder dan subtract
extrude
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Latihan 3
Ganti arah sistem koordinat
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Latihan 4Gambarlah model 3D dengan kombinasi box, cylinder, lalu subtract dan fillet
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Latihan 5