Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 1 Question of the Day What do burglar alarms, windshield wiper blades, Kevlar vests and laser printers have in common? ANSWER: They were all invented by women!

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 2 Topics For Today Drawing No. 16 is due now Lab report due on at the beginning of your lab period Descriptive Geometry Read BTG Chapter 11, Section 5

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 3 Descriptive Geometry Graphics representation of the plane, solid and analytical geometry used to describe real (or imagined) objects It is the foundation, the underlying science of engineering technical drawings Traditional methods for solving spatial design problems: Direct view Revolution Fold-line

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 4 Line Types Vertical, horizontal, or inclined Top Front If a line is parallel to one of the principal projection planes, it’s called a principal line Frontal (parallel to and true length in a frontal plane) Horizontal Profile TL

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 5 Plane Types Horizontal Plane (True Size Projection In Top Or Bottom Views) AFAF BFBF CFCF ATAT BTBT CTCT TS Top Front

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 6 Descriptive Geometry - Planes Vertical plane (appears as edge in top and bottom views) Profile (appears as edge in front view and is parallel to profile projection plane) Frontal (appears as edge in profile view and is parallel to frontal projection plane)

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 7 Descriptive Geometry - Planes C TS Top ABC A B Frontal Profile TS D E F D F E E D F L L M M N N Inclined (Not TS!!)

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 8 Descriptive Geometry - Planes X Y Z X Y Z Oblique (Not True Size Projection In Principal Views)

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 9 Key to Descriptive Geometry Top Front Right Side Know the location of the origin (0,0,0)

Fundamentals of Engineering – Honors – ENGR H191 Lecture 9 - AutoCAD 10 Today’s Assignment Dwg 17 – SGAC-3-1 Space Geometry in AutoCAD Pierce point of a line and a plane Due at end of class today Dwg 18 – SGAC-3-2 Space Geometry in AutoCAD Intersection of Planes Due at beginning of next lecture