Multiview drawings AC-IDD-5. Students will create technical freehand sketches. AC-IDD-11. Students will use orthographic projection to create and dimension multiview drawings.

Technical drawings/multiview drawings GIVES CLEARER MORE ACCURATE DESCRIPTION OF OBJECT THAN A PICTURE OR WRITTEN DESCRIPTION DRAW VIEWS OF THE OBJECT AS IT IS SEEN FROM DIFFERENT POSITIONS VIEWS ARE ARRANGED IN A STANDARD ORDER

SIX VIEWS OF AN OBJECT MOST OBJECTS HAVE SIX SIDES/VIEWS: TOP BOTTOM FRONT REAR RIGHT-SIDE LEFT-SIDE IN MOST CASES ONLY 2-3 VIEWS ARE NEEDED TO COMPLETELY SHOW THE SHAPE AND SIZE OF AN OBJECT

NORMAL VIEWS THREE MOST COMMON VIEWS: FRONT: SHOWS WIDTH AND HEIGHT TOP: SHOWS WIDTH AND DEPTH RIGHT-SIDE: SHOWS DEPTH AND HEIGHT ONLY NEED 3 VIEWS USUALLY BECAUSE SOME VIEWS GIVE THE SAME INFORMATION FOUND ON OTHER VIEWS

ORTHOGRAHIC PROJECTION PROCESS OF PROJECTING 2 OR MORE VIEWS OF AN OBJECT ONTO IMAGINARY PLANES BY DRAWING LINES PERPENDICULAR FROM THE OBJECT TO THE PLANES MADE WITH THREE PLANES: VERTICAL/FRONTAL HORIZONTAL PROFILE VIEWS THAT MAKE UP MULTIVIEW DRAWINGS ARE CREATED THROUGH ORTHOGRAPHIC PROJECTION PICTORIAL DRAWING IS THE 3D SHAPE USED WHEN CREATING TECHNICAL DRAWINGS

ANGLES OF PROJECTION FRONT VERTICAL AND HORIZONTAL PLANES DIVIDE THE SPACE INTO 4 QUADRANTS FIRST ANGLE PROJECTION: USED IN EUROPEAN COUNTRIES THIRD ANGLE PROJECTION: USED IN THE U.S. AND CANADA FRONT VIEW IS PROJECTED ONTO THE VERTICAL PLANE TOP VIEW IS PROJECTED ONTO THE HORIZONTAL PLANE RIGHT-SIDE VIEW IS PROJECTED ONTO THE PROFILE PLANE Show vertical (front of face), horizontal (top of head), profile (side of face) FRONT

DECIDING WHICH VIEWS TO USE FRONT VIEW IS TYPICALLY THE ONE THAT SHOWS THE MOST CHARACTERISTICS OR IS THE LONGEST VIEW– ONLY CHOSEN VIEW TOP AND RIGHT-SIDE VIEWS ARE CHOSEN BASED ON THE NORMAL POSITION OF THEIR RELATIONSHIP TO THE FRONT VIEW

Number of views to draw WHEN AN OBJECT HAS A UNIFORM THICKNESS ONLY ONE VIEW IS NEEDED AN OBJECT CAN BE SHOWN IN TWO VIEWS WHEN THE THIRD VIEW WOULD ADD NOTHING TO THE DESCRIPTION A and B: top and front view are the same (use side and front) C and D: top views are necessary (use top and front)

Curved surfaces CYLINDERS AND CONES DO NOT SHOW CURVES IN ALL VIEWS THEY APPEAR AS CIRCLES IN ONE VIEW AND STRAIGHT LINES IN ANOTHER CYLINDER APPEARS AS A CIRCLE IN ONE VIEW AND A RECTANGLE IN ANOTHER CONE APPEARS AS A CIRCLE IN ONE VIEW AND A TRIANGLE IN ANOTHER ANY OBJECT WITH A SPHERE WILL HAVE CIRCLES IN ALL VIEWS

Alphabet of Lines Line symbols used in technical drawing are often referred to as ALPHABET OF LINES. The use of line symbols enables engineers/designers to express features of designed products clearly and accurately.  Line features vary not only by width but also by how they are graphically represented in a drawing. Line significance is conveyed by line weight or thickness of the line. Every line is drawn at different thickness and darkness to express contrast as well as importance. Lines that are less important are thin and light. Key to successful drafting is to have a good technical knowledge of these various line characteristics – to understand where and when to apply them in technical drawing.

Alphabet of Lines

Hidden lines NARROW, SHORT DASHED LINES DRAWN WITH 0.5MM F PENCIL 1/8 DASH, 1/32 GAP SHOWS THE OUTLINE OF A FEATURE THAT CAN NOT BE SEEN IN A PARTICULAR VIEW What do you notice that is different about the center lines in the front and top views than what we are accustomed to drawing?

Center Lines Center A center line is drawn through the center of a feature (Figure 3- 5).

DIMENSIONING DIMENSIONING COMMUNICATES SHAPE AND SIZE IN A CLEAR AND ACCURATE FASHION EACH FEATURE OF AN OBJECT IS ONLY DIMENSIONED ONCE SHOULD BE PLACED IN THE MOST DESCRIPTIVE VIEW OF THE FEATURE BEING DIMENSIONED (DO NOT DIMENSION HIDDEN LINES)

Alphabet of Lines

Alphabet of Lines

Multiview practice #1

Multiview practice – Getting Started TOP FRONT RIGHT

Multiview practice #1 - answer

Multiview practice #2

Multiview practice #2 - answer

Multiview practice #3 HOW WOULD A HOLE BE INDICATED ON THE TOP AND RIGHT SIDE VIEWS THAT IS SHOWN IN THE FRONT VIEW AS A CIRCLE? INCLUDE CENTER LINES

Multiview practice #3 - Answer HOW WOULD A HOLE BE INDICATED ON THE TOP AND RIGHT SIDE VIEWS THAT IS SHOWN IN THE FRONT VIEW AS A CIRCLE? INCLUDE CENTER LINES

Multiview practice #4

Multiview practice #4 - answer

Level of understanding: 1, 2, 3 ON THE BACK OF YOUR HANDOUT, MARK WHETHER YOU BELIEVE YOU ARE A 1, 2 OR 3 1: I NEED HELP OR I AM STILL STRUGGLING TO UNDERSTAND 2: I GET IT OR MOSTLY UNDERSTAND 3: I GET IT, LETS MOVE ON TO SOMETHING HARDER