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  1. 1. ME252 Mechanical Engineering Drawing 2022/2033
  2. 2.  Course Title: Mechanical Engineering Drawing  Course Code:ME252  Reference Books: 1- Boundy, “engineering Drawings”, McGraw – Hill Co, Latest Edition. 2- Jackson, “Advanced Technical Drawing”, Longman, Latest Edition. 3- Ralph Grobowski, "The illustrated AutoCAD 2018 Quick reference", 2018, Autodesk Press.  Lectures: Power Point 2
  3. 3. 3 WEEK LECTURE 1 AutoCAD Basics 2 AutoCAD Basics 3 Fits & Tolerances 4 Bolted Joints 5 Bolted Joints 6 Key Connections 7 7th Week Exam 8 Sliding Bearing 9 Anti-friction Bearing 10 Spur Gears 11 Helical Gears 12 12th Week Exam 13 Bevel Gears 14 Worm Gears 15 Final Exam ME252 Mechanical Engineering Drawing Syllabus
  4. 4. Assessment & Grading System  1st control test on 7th week (30%)  2nd control test on 12th week (20%)  Student attendance and participation (10%)  Final exam (40%) 4
  5. 5. What is AutoCAD?  AutoCAD is a CAD (Computer Aided Design or Computer Aided Drafting) software application for 2D and 3D design and drafting.  STARTING AutoCAD learning AutoCAD will give you the basics for learning other CAD packages because many commands, terms and concepts are used universally. 5
  6. 6. STARTING AutoCAD® 2018  Select the AutoCAD 2018 option on the Program menu or select the AutoCAD2018 icon on the Desktop 6
  7. 7.  Note that AutoCAD automatically assigns generic name, Drawing X, as new drawings are created. 7
  8. 8. Status Bar and Command Prompt  The Status Bar is the area below the command line that shows messages as well as coordinates, modes, and the current time.  To activate SNAP, GRID, ORTHO, OSNAP, MSPACE, PSPACE, and TILE, you must double- click on the mode to change. 8
  9. 9. Menus, Ribbons, and Toolbars  Menu Browser 1. Click the A icon in the upper left corner of the drawing area. 2. Click the desired menu. 3. Click the command to be executed from the menu 9
  10. 10. Ribbons  The ribbon provides a single, compact placement for operations that are relevant to the current workspace.  The ribbon can be displayed horizontally, vertically, or as a floating palette. 10
  11. 11. Quick Access Toolbar  Click one of the following icons for quick access to commands QNEW, OPEN, SAVE, PLOT, and UNDO/REDO. 11
  12. 12. Pointing Device  Left Mouse Button: Used to pick or select objects. 1. Click the left mouse button to select an object area in the drawing. 2. Press ESC twice to deselect an object (or to cancel a command).  Right Mouse Button: Used to enter a command, repeat last command, or access shortcut menus.  Mouse Wheel: Some point devices such as a mouse have a middle wheel that can be used to zoom in and out of the drawing window. 12
  13. 13. On-Line Help 1- Help, AutoCAD Help. or 2- Click the Help icon. or 3- Type HELP at the command prompt Command: HELP or 4- Press Function Key F1 13
  14. 14. Introduction to Commands  Creating a New Drawing 1.Click the A icon and New. Or Press CTRL + N or Click the New icon . Or Type NEW at the Command prompt. Command: NEW 2. Choose One of the options for creating a new drawing. 3. Click The OK button. 14
  15. 15. Introduction to Commands  Open Existing Drawings 1. Click the A icon and OPEN or Press CTRL + O. or Click the OPEN icon . Or Type OPEN at the command prompt. 2. Press ENTER on the keyboard. 3. Double Click the desired directory to find the drawing to open. 4. Click the drawing name to open 15
  16. 16. Introduction to Commands  Saving Drawings AutoCAD saves its drawings as files with extensions ending in .DWG. 1. Click the A icon and Save or Save as. or Type SAVE or SAVEAS at the command prompt. Command: SAVE or SAVEAS 2. Press ENTER 3. Type A new drawing name or keep the existing drawing name. 4. Click The OK button. 16
  17. 17. CAD and Coordinate System  Drawings created in a CAD system are usually defined and stored using sets of points in what is called world space.  the world space is defined using a three-dimensional Cartesian coordinate system X-, Y-,and Z-axes.  Any point in world space can then be defined as the distance from the origin in the X-, Y- and Z directions. 17
  18. 18.  In AutoCAD, the coordinate system that is used to create entities is called the user coordinate system (UCS).  By default, the user coordinate system is aligned to the world coordinate system (WCS).  The world coordinate system is a coordinate system used by AutoCAD as the basis for defining all objects and other coordinate systems defined by the users. 18 CAD and Coordinate System
  19. 19. Cartesian and Polar Coordinate Systems In a two-dimensional space, a point can be represented using different coordinate  Cartesian coordinate system The point can be located as X and Y units  Polar coordinate The same point can also be located as r and θ Positive angle is measured anticlockwise 19
  20. 20. LINE (Command)  With LINE, you can create a series of contiguous line segments. Each segment is a line object that can be edited separately Ribbon: Home tab, Draw panel, Line Menu: Draw, Line 20
  21. 21. CIRCLE (Command) Ribbon: Home tab, Draw panel, Circle drop-down Center, Radius Menu: Draw Circle Center, Radius  Type One of the following options: 1- Center Point: Draws a circle based on a center point and a diameter or a radius. 21
  22. 22. CIRCLE (Command) 2- 3P (Three Points): Draws a circle based on three points on the circumference. 3- TTT: a circle tangent to three objects. 22
  23. 23. CIRCLE (Command) 4- 2P (Two Points): Draws a circle based on two endpoints of the diameter. 5- TTR (Tangent, Tangent, Radius): Draws a circle with a specified radius tangent to two objects. 23
  24. 24. Arc (Command)  Creates an arc. Ribbon: Home tab, Draw panel, Arc drop-down, 3-Point Menu: Draw Arc  To create an arc, you can specify combinations of center, endpoint, start point, radius, angle, chord length, and direction values. 24
  25. 25. Arc (Command)  Start point: Draws an arc using three specified points on the arc's circumference. 1- The first point: is the start point (1). 2- Second point: Specify the second point (2) is a point on the circumference of the arc. 3- End point: Specify the final point (3) on the arc. 25
  26. 26. PLINE (Command)  A 2D polyline is a connected sequence of segments created as a single planar object. You can create straight line segments, arc segments, or a combination of the two Ribbon: Home tab, Draw panel, Polyline Menu: Draw, Polyline 26
  27. 27. POLYGON (Command)  Creates an equilateral closed polyline. Ribbon: Home tab, Draw panel, Rectangle Menu: Draw, Rectangle  You can specify the different parameters of the polygon including the number of sides. The difference between the inscribed and circumscribed options is shown.  Number of sides: Specifies the number of sides in the polygon (3-1024). 27
  28. 28. POLYGON (Command)  Center of polygon: Specifies the location of the center of the polygon and whether the new Object is inscribed or circumscribed. 1- Inscribed in circle: Specifies the radius of a circle on which all vertices of the polygon lie. 2- Circumscribed about circle: Specifies the distance from the center of the polygon to the midpoints of the edges of the polygon. 28
  29. 29. ELLIPSE (Command)  Creates an ellipse or an elliptical arc. Ribbon: Home tab, Draw panel Ellipse drop down, Center Menu: Draw, Ellipse Center  The first two points of the ellipse determine the location and length of the first axis. The third point determines the distance between the center of the ellipse and the end point of the second axis. 29
  30. 30. Erase Command 1. Choose Modify, Erase. Or Click the Erase icon . o Pick Object at the select object prompt. o Select objects: (pick object) o Press ENTER when you are done choosing objects. 2- Type ERASE at the command prompt. o Command: ERASE or E o Select objects: ENTER 30
  31. 31. Basic Display Commands  ZOOM Increases or decreases the apparent size of objects in the current viewport 1. Choose View, Zoom. or 2. Type ZOOM at the command prompt. Command: Zoom or Z 3. Type One of the following zoom options: o All: Places entire drawing (all visible layers) on display at once. Forces a regeneration. o Extents: Displays current drawing content as large as possible. o Previous: Restores previous view. o Window: Designates rectangular area to be drawn as large as possible. 31
  32. 32. Basic Display Commands  PAN : Shifts the location of a view. 1. Choose View, Pan. or 2. Click the Pan icon . or 3. Type PAN from the command prompt. Command: PAN or P 32
  33. 33. Object Snapping  An object snap mode specifies a snap point at an exact location on an object.  OSNAP specifies running object snap modes, which remain active until you turn them off. 33
  34. 34. Edit Commands  Move Command 1. Choose Modify, Move. Or Click the Move icon. Or Type MOVE at the command prompt Command: MOVE or M 2. Pick Objects to move Select objects: (select) 3. Pick A point to move from Base point or displacement: (pick point) 4. Pick A point to move to Second point of displacement: (pick point) 34
  35. 35. Copy Command 1. Choose Modify, Copy. Or Click the Copy icon. Or Type COPY at the command prompt. Command: COPY or CP 2. Pick Objects to copy. Select objects: (select) 3. Pick A point to move from. Base point or displacement/Multiple: (pick point). 4. Pick A point to copy to. Second point of displacement: (pick point) Or Type A point to copy to. Second point of displacement: @ 1<0 35
  36. 36. Offset Command Offset Distance To offset a specified distance: 1. Choose Modify, Offset. or 2. Type OFFSET at the command prompt. Command: OFFSET or O 3. Type The distance to offset. Offset distance or <Through point>: (number) 4. Pick The object to offset. 5. Pick A side to offset object to. Side to offset: (pick side) 6. Press Enter to end the command. 36
  37. 37. EXTEND Commands 1. Choose Modify, Extend. or 2. Click the Extend icon. or 3. Type EXTEND at the command prompt Command: EXTEND Select boundary edge(s)... 4. Pick The BOUNDARY edge to extend to Select objects: (select) 5. Press ENTER to accept the boundary edge Select objects: (press enter) 6. Pick The objects to extend <Select object to extend> / Project / Edge / Undo: Select an object, enter an option, or press enter : (select) 7. Press ENTER when you are done choosing objects 37
  38. 38. Trim Command 1. Choose Modify, Trim. or 2. Click the Trim icon. 3. Type TRIM at the command prompt Command: TRIM Select cutting edge(s)... 4. Pick The CUTTING edge to extend to Select objects: (select) 5. Press ENTER to accept the cutting edge Select objects: (press enter) 6. Pick Objects to trim <Select object to trim> / Project / Edge / Undo: Select an object, enter an option, or press enter 7. Press ENTER when you are done choosing objects Select object to trim/Undo: (press enter) 38
  39. 39. MIRROR 1. Choose Modify, Mirror. or 2. Click the Mirror icon. or 3. Type MIRROR at the command prompt. Command: MIRROR 4. Pick Objects to mirror. Select objects:(select) 5. Pick First point of mirror line: (point) 6. Pick Second point: (point) 7. Type Yes to delete the original objects and No to keep them. Delete old objects? Y or N 39
  40. 40. ROTATE 1. Choose Modify, Rotate. or 2. Click the Rotate icon. 3. Type ROTATE at the command prompt Command : ROTATE 4. Pick Objects to rotate: Select objects:(select) 5. Pick A pivot point to rotate around Base point: (point) 6. Type A rotation angle<Rotation angle>/Reference: 40
  41. 41. SCALE 1. Choose Modify, Scale. or 2. Click the Scale icon. or 3. Type SCALE at the command prompt Command: SCALE Select objects: (select objects) 4. Pick A pivot point to scale about Base point: (point) 5. Type A rotation angle<Scale factor>/Reference:(number) 41
  42. 42. Explode  Explodes a compound object when you want to modify its components separately. Objects that can be exploded include blocks, polylines, and regions, among others 42
  43. 43. Chamfers  A chamfer connects two objects to meet in a flattened or beveled corner.  A chamfer connects two objects with an angled line. It is usually used to represent a beveled edge on a corner. 43
  44. 44. Fillets  The fillet command is very similar to the chamfer command above, except instead of creating a straight line chamfer, Autocad creates a radius between the two points 44
  45. 45. Setting Up a Drawing A-Drawing Units Setup  Every object we construct in a CAD system is measured in units. We should determine the system of units within the CAD system before creating the first geometric entities. 1- In the Menu Bar select: [Format] [Units] 45
  46. 46. Setting Up a Drawing 2- Click on the Length Type option to display the different types of length units available. Confirm the Length Type is set to Decimal. 46 3- In the Drawing Units dialog box, set the Length Type to Decimal. This will set the measurement to the default English units, inches.
  47. 47. Setting Up a Drawing 4- Set the Precision to two digits after the decimal point as shown in the above figure. 6- Pick OK to exit the Drawing Units dialog box. 47
  48. 48. B-Drawing Area Setup  Next, we will set up the Drawing Limits by entering a command in the command prompt area.  Setting the Drawing Limits controls the extents of the display of the grid.  It also serves as a visual reference that marks the working area.  It can also be used to prevent construction outside the grid limits and as a plot option that defines an area to be plotted/printed. 48
  49. 49.  Drawing Area Setup 1- In the Menu Bar select: [Format] [Drawing Limits] 49
  50. 50.  Drawing Area Setup 2- In the command prompt area, the message “Reset Model Space Limits: Specify lower left corner or [On/Off] <0.00,0.00>:” is displayed. Press the ENTER key once to accept the default coordinates <0.00,0.00>. 50 3- In the command prompt area, the message “Specify upper right corner <12.00,9.00>:” is displayed. Press the ENTER key again to accept the default coordinates <12.00,9.00>.
  51. 51. Exercise#1  Angle spacer(CW) 51
  52. 52. Exercise#1  Base plate(CW) 52
  53. 53. Exercise#1  T clip (HW) 53
  54. 54. Exercise#1  Face plate (HW) 54
  55. 55. Exercise#1  Wrench(HW) 55