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This document discusses 3D modeling concepts in AutoCAD, including: - Coordinate systems used to locate points in 3D space such as absolute, relative rectangular, relative polar, and direct distance entry coordinates. - Object snaps that improve accuracy when drafting. - The user coordinate system (UCS) which allows relocating and reorienting the drawing origin for 3D modeling. - Orthographic views defined by the X, Y, and Z axes. - Constructing a basic 3D wireframe model on the XY plane using lines and ortho mode.
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The document provides an overview of the basics of using AutoCAD software. It describes key areas of the AutoCAD interface such as the command line, drawing area, status bar and toolbars. It also outlines how to set up a drawing by defining units, limits and grid/snap settings. Basic drawing commands like lines, circles and modifying objects are explained. The document concludes with information on layers, dimensions, hatching, selecting objects and plotting a drawing.
Grid 2.pptx
This document discusses grid generation and computational fluid dynamics (CFD). It covers choosing grids for simple and complex geometries, grid generation methods like conformal mapping and differential equation methods, and using commercial software. It provides examples of generating 2D pipe and 3D airfoil grids using Gridgen software, including creating connectors, domains, blocks, and boundary conditions. It also describes a systematic approach to generate a series of grids with uniform refinement ratios for CFD uncertainty analysis.
chapter 2 Coordinate Systems.ppt
The document discusses different coordinate systems and display controls in AutoCAD. It describes Cartesian and polar coordinate systems, including absolute and relative coordinates. It also explains various zooming tools like zoom window and scale, panning, and commands for redrawing and regenerating drawings for optimal viewing.
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Kuliah+1+ +cad+bda20502
- 1. BDA 20502 MOHD NIZAM B KATIMON JKBR, FKMP MOHD NIZAM B KATIMON 1
- 2. Chapter 1 Intro - 3D Terms Coordinate System Started with 3D UCS Orthographic view MOHD NIZAM B KATIMON 2
- 3. Intro - 3D Terms Wireframe Model: MOHD NIZAM B KATIMON 3
- 4. Intro - 3D Terms Surface Model: MOHD NIZAM B KATIMON 4
- 5. Intro - 3D Terms Solid Model: MOHD NIZAM B KATIMON 5
- 6. AutoCAD 2009 RIBBON MOHD NIZAM B KATIMON 6
- 7. Coordinate System and Snaps Application Absolute coordinates Relative coordinates Direct distance entry Objects snap MOHD NIZAM B KATIMON 7
- 8. Coordinate Systems AutoCAD uses the following coordinate systems to locate a point in an XY plane. 1. 2. 3. Absolute coordinates Relative coordinates - Relative rectangular coordinates - Relative polar coordinates Direct distance entry MOHD NIZAM B KATIMON 8
- 9. Coordinate Systems • Absolute coordinates - points are located with respect to the origin (0,0) Command: Line (10,50) (50,50) (50,10) (10,10) MOHD NIZAM B KATIMON 9
- 10. Coordinate Systems • Relative rectangular coordinates - the displacements along X,Y axes are measured with reference to the previous point rather than to the origin (0,0) Command: Line (@-50,0) (@0,-50) (@0,50) (@50,0) (10,10) MOHD NIZAM B KATIMON 10
- 11. Coordinate Systems • Relative polar coordinates - defining both the distance of the point from current point and the angle Command: Line (@50<30) (10,10) MOHD NIZAM B KATIMON 11
- 12. Coordinate Systems • Direct distance entry - the direction is determined by the position of the cursor Command: Line MOHD NIZAM B KATIMON 12
- 13. Snap Application • Object snaps (OSNAP) - to improve performance/accuracy and make drafting simpler • Keyboard Shortcut ON/OFF: F3 • Command: OSNAP MOHD NIZAM B KATIMON 13
- 14. Snap Application • OSNAP Overrides - Use SHIFT + Right-click and select the object snap from the shortcut menu MOHD NIZAM B KATIMON 14
- 15. Started with 3D MOHD NIZAM B KATIMON 15
- 16. Started with 3D MOHD NIZAM B KATIMON 16
- 17. UCS World Coordinate System (WCS) • • Fixed origin (0,0,0) located at the lower left corner by default and cannot be removed. WCS is generally used in 2D drawings, wireframe models and surface models. Why UCS? make easier in create a feature. UCS allows to relocate and reorient the origin depends to user, mostly used in 3D. MOHD NIZAM B KATIMON 17
- 18. UCS Conventions in AutoCAD - ‘Right-hand rule’ – identify the X,Y,Z axes direction. ‘Right-hand thumb rule’ - Identify the direction of rotation in 3D space. MOHD NIZAM B KATIMON 18
- 19. UCS 1. Toolbar 2. Command : UCS MOHD NIZAM B KATIMON 19
- 20. UCS UCSICON (2 methods) 1. Menu : View > Display > UCS Icon 2. Command : UCSICON Select “properties” MOHD NIZAM B KATIMON 20
- 21. Orthographic View • Understandings X, Y and Z axes Z • XY, YZ, XZ Plane Y MOHD NIZAM B KATIMON x 21
- 22. Activities • Construct 3D Wireframe Model Guide: • Use line Command • Ortho ON • Work on XY plane MOHD NIZAM B KATIMON 22