Engineering 22 Introduction to © Auto. CAD Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@Chabot. College. edu Engineering 22 – Engineering Design Graphics 1 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
What are the “C”, “A”, and “D”? § CAD Stands for One of • Computer Aided Design – The More Typical Definition • Computer Aided Drafting § Sometimes See CADD or CAE • Computer Aided Drafting & Design – Covers Both Bases • Computer Aided Engineering – Typically CADD + Numerical-Analysis Engineering 22 – Engineering Design Graphics 2 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Elements of a CAD System § § Computer; e. g. , Desk. Top PC Input Devices; e. g. , mouse, Key. Bd Out. Put Devices; e. g. , Plotter, Printer Operating Software; e. g. Windows. XP, Mac OSX, Unix, Linux § CAD/CAE Application Software • e. g. , Auto. CAD, Turbo. CAD, Pro. E, Solid. Works, many others Engineering 22 – Engineering Design Graphics 3 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
CAD Software § Common Basic Elements • Commands to generate geometry – Makes Mathematically Accurate Lines, Curves, Surfaces, Volumes, etc. • Functions for controlling views • Modifiers for changing drawing geometry • Annotation commands for adding text, dimensions, and notes § The use of CAD has Revolutionized Engineering Graphics Engineering 22 – Engineering Design Graphics 4 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Rm 1618 CAD Lab § Room 1618 Contains the Computers and Auto. CAD 2006 Software § The CADLab Operates in OPEN Fashion • ENGR 22 Students can Use it Any. Time it is Open • ENGR 22 Students Do NOT have Priority over other Users – except During ENGR 22 Lab when ENGR 22 Has Top Priority Engineering 22 – Engineering Design Graphics 5 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Rm 1618 CAD Lab cont § The “On. Duty” CADLab Supervisor Can Assist with OPERATION of the Lab, Computers or Auto. CAD • e. g. , He/She can show you how to. Turn on Auto. CAD, print, etc. • He/She May NOT be able to help with questions related to Course CONTENT § BMayer on On. Duty per Syllabus • CAN Assist with Course Content Engineering 22 – Engineering Design Graphics 6 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Starting Auto. CAD § Turn on one of the rm 1618 Computers § Double. Click the Auto. CAD Icon Engineering 22 – Engineering Design Graphics 7 § Should Bring Up the Auto. CAD Work. Space Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Auto. CAD Work. Space Layer TB Standard TB Modify TB Pull. Down Menus Drawing TB Object Properties TB Cursor Drawing Area Command Line Co. Ord Display Engineering 22 – Engineering Design Graphics 8 Status Line Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Auto. CAD Tool. Bars: Move/Size § ACAD Tool. Bars Can Moved and Sized using the Same Techniques as with other MSWindows Applications Engineering 22 – Engineering Design Graphics 9 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Re. Size Command. Line Box Resize Using Double-Bar Cursor Recommend Minimum 2 -Lines High Engineering 22 – Engineering Design Graphics 10 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Tool. Bars Described § Auto. CAD Tool. Bars Behave in the Same Manner as other Windows-Apps Tool. Bars Each Icon is called a “Tool” Engineering 22 – Engineering Design Graphics 11 Allowing the Cursor to “Linger over a Tool Brings up a Descriptive “Tool. Tip” Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Start a NEW Drawing § Start a New Drawing by One of • Pull. Down Menus: File → New. . . • Type “new” in the Command Line • Using the “QNew” (Quick. New) Tool Engineering 22 – Engineering Design Graphics 12 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Select Template Dialog-Box • Appears After the New File Command(s) • A Template is a Standard format • For Now Suggest Using the acad. dwt Template • Click Open to Start the New Drawing Engineering 22 – Engineering Design Graphics 13 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Name & Save Drawing § Opening a NEW § Naming Auto. CAD Files Drawing Results in a • NOT Case Sensitive Default Name of • Any Combination of Drawing. N. dwg Letters and Numbers – Also Allowed = $, -, _ • Not Allowed = , /, %, * § Use File → Save or The Save-Tool to Give the Dwg a new Name Engineering 22 – Engineering Design Graphics 14 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Auto. CAD Drawing Units § “ACAD” Has Five Unit-Systems • Each has Five Formatting Parameters § To Adjust the Unit System Use the Pull. Down Menu • Format → Units. . . Engineering 22 – Engineering Design Graphics 15 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Format Units § The Drawing Units Dialog Box § In ENGR 22 We will Typically Use for Length Units • Type → Decimal • Insertion Scale → one of – Inches (in or “) – Millimeters (mm) • Precision – in → 0. 00 or 0. 000 – mm → 0 or 0. 00 Engineering 22 – Engineering Design Graphics 16 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Format Units cont § In ENGR 22 We will Typically Use for Angle Units • Type → Decimal Degree • Precision → 0 or 0. 0 • Counter. Clockwise Engineering 22 – Engineering Design Graphics 17 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Standard Paper Sheet Sizes § USA Standards (in) • • • A = 8. 5 x 11 (1. 29 AR) B = 11 x 17 (1. 55 AR) C = 17 x 22 (1. 29 AR) D = 22 x 34 (1. 55 AR) E = 34 x 44 (1. 29 AR) § Notes • Nice, Round No. s • Inconsistent Aspect Ratios (ARs) Engineering 22 – Engineering Design Graphics 18 § ISO 216 Paper (mm) • • • A 4 = 210 x 297 (1. 41 AR) A 3 = 297 x 420 (1. 41 AR) A 2 = 420 x 594 (1. 41 AR) A 1 = 594 x 841 (1. 41 AR) A 0 = 841 x 1189 (1. 41 AR) § Notes • UNround Numbers • Constant Aspect Ratio = 2 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Drawing Limits § In ENGR 22 Hard. Copy Output will done on “A-size” (8. 5” x 11”) Paper § ACAD Drawing Limits set the Boundaries § Example: Set Drawing Limits 1. Open a New Drawing using acad. dwt 2. Use the Pull. Down Menu: Format → Drawing Limits. . . • The “Limits” Usually Set to Match the Paper Size Engineering 22 – Engineering Design Graphics 19 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Drawing Limits cont – Brings up notation in Command Line 3. Accept the Lower. Left at <0. 0000, 0. 000> by hitting Enter 4. Enter 11, 8. 5 and hit Enter to set the Upper Right Limit – Brings the Next Query into the Command Line Engineering 22 – Engineering Design Graphics 20 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Grid & Snap § Grid is just a visual aid for your drawing § Snap allows you to specify precise coordinates when using the mouse § They are modified with the GRID and SNAP commands § Neither affect anything already drawn Engineering 22 – Engineering Design Graphics 21 § They can be changed on-the-fly § Function keys set GRID and SNAP § “modes”: on and off § F 7 - Sets GRID mode on/off § F 9 - Sets SNAP mode on/off Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Grid & Snap § acadiso. dwt • Limits (420, 297) § Grid set to 10 mm § Snap set to 20 mm Engineering 22 – Engineering Design Graphics 22 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Example → 1 st Drawing 1. Fire up Auto. CAD 2. Make a new Drawing using acad. dwt 3. Save the File as Your. Name-01. dwg • e. g. ; BMayer 01. dwg 4. Make a NEW LAYER Called “Object” Engineering 22 – Engineering Design Graphics 23 Click Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont Type “Object” • Pick the GREEN Box and then click OK Click “Color → white” Engineering 22 – Engineering Design Graphics 24 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont • Set the “Object” Layer to Current Double click the “Status” box 5. Hit the Save tool 6. Use the drawing Tools to make some Shapes & Lines that Fill a significant Portion of the screen • Set the “Object” Layer to Current using Status box • Click OK Engineering 22 – Engineering Design Graphics 25 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont Save Again Drawing Tool. Bar Engineering 22 – Engineering Design Graphics 26 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont 7. Use the Pull Down Menu: Draw → Text → Multiline Test. . . 8. Drag the mouse to • • form an “MTEXT” Box Activates the “Text Formatting” Box 9. In the Format Box Change the Text Size to 15 -25 • Or Whatever fits your dwg Engineering 22 – Engineering Design Graphics 27 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont Change to 25 MTEXT Box Engineering 22 – Engineering Design Graphics 28 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont 10. Click in Inside the MTEXT Box and Type Your HW-ID • • Fname Lname Date Class ID = ENGR 22 HW ID = HW-nn 11. Click Out. Side the MTEXT Box to De. Activate 12. Hit Save, yet again Engineering 22 – Engineering Design Graphics 29 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont 13. In the Command Line type zoom, then Hit Enter 14. At the Query Prompt the letter “e” (for “extents”) Then Hit Enter § Your Drawing will Zoom in to Fill the Screen Engineering 22 – Engineering Design Graphics 30 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont zoom → extents Engineering 22 – Engineering Design Graphics 31 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont 15. Use the Pull. Down Menu: File → Plot • Activates the Plot Dialog Box Engineering 22 – Engineering Design Graphics 32 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
1 st Drawing cont § ASK the CAD-Lab Supervisor about the PROPER Settings to Obtain an A-Size (8. 5 x 11) Print. Out 16. In the Print Dialog Box click OK 17. Pick up your Copy and you’re done Engineering 22 – Engineering Design Graphics 33 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
All Done for Today See Me in rm 1618 Lab For Plotting Tutorial Engineering 22 – Engineering Design Graphics 34 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Engineering 22 Appendix Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@Chabot. College. edu Engineering 22 – Engineering Design Graphics 35 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
ISO 216 Paper Size System In the ISO paper size system, the height-to-width ratio of all pages is the square root of two (1. 4142 : 1). This aspect ratio is especially convenient for a paper size. If you put two such pages next to each other, or equivalently cut one parallel to its shorter side into two equal pieces, then the resulting page will have again the same width/height ratio. The ISO paper sizes are based on the metric system. The square-root-of-two ratio does not permit both the height and width of the pages to be nicely rounded metric lengths. Therefore, the area of the pages has been defined to have round metric values. • The height divided by the width of all formats is the square root of two (1. 4142). • Format A 0 has an area of one square meter. Engineering 22 – Engineering Design Graphics 36 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
Comments Viewing AR’s § Humans have Much Greater Lateral Peripheral Vision than Vertical • Suggests that “Wide Screens” Are Better § Some Viewing Aspect Ratios • • • 1. 25: 1 = 8 x 10 photo 1. 33: 1 = NTSC TV Screen 1. 78: 1 = HDTV (Movie Compatible) 1. 85: 1 = “Academy Flat” Movie 2. 35: 1 = “Panavision” Movie Engineering 22 – Engineering Design Graphics 37 Bruce Mayer, PE BMayer@Chabot. College. edu • ENGR-22_Lec-02_ACAD_Intro. ppt
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