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Multiview drawings. Technical drawings/ multiview drawings. GIVES CLEARER MORE ACCURATE DESCRIPTION OF OBJECT THAN A PICTURE OR WRITTEN DESCRIPTION VIEWS OF THE OBJECT AS IT IS SEEN FROM DIFFERENT POSITIONS VIEWS ARE ARRANGED IN A STANDARD ORDER. SIX VIEWS OF AN OBJECT.
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Technical drawings/multiview drawings • GIVES CLEARER MORE ACCURATE DESCRIPTION OF OBJECT THAN A PICTURE OR WRITTEN DESCRIPTION • 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 • TYPICALLY 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 • TYPICALLY ONLY NEED 3 VIEWS BECAUSE SOME VIEWS GIVE 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 • VIEWS THAT MAKE UP MULTIVIEW DRAWINGS ARE CREATED THROUGH ORTHOGRAPHIC PROJECTION • MADE WITH THREE PLANES: • VERTICAL/FRONTAL • HORIZONTAL • PROFILE • PICTORIAL DRAWING IS THE 3D SHAPE USED WHEN CREATING TECHNICAL DRAWINGS
ANGLES OF PROJECTION • 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 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 DRAWN BASED ON THE NORMAL POSITION 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 • WHICH VIEWS ARE NEEDED FOR A? • FRONT AND SIDE • WHICH VIEWS ARE NEEDED FOR B? • FRONT AND SIDE • WHICH VIEWS ARE NEEDED FOR C? • FRONT AND TOP • WHICH VIEWS ARE NEEDED FOR E? • FRONT AND ??
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
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 ABOUT THE CENTER LINES IN THE FRONT AND TOP VIEWS THAT IS DIFFERENT THAN WHAT WE TYPICALLY DO WITH DRAWINGS?
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)
Multiview practice – Getting Started 1) DETERMINE FRONT VIEW 2) SKETCH OUT FRONT VIEW 3) PROJECT WIDTH AND LINES TO TOP VIEW 4) DETERMINE DEPTH FOR TOP VIEW 5) PROJECT HEIGHT AND LINES TO RIGHT SIDE VIEW 6) DRAW MITER LINE 7) PROJECT DEPTH TO MITER LINE 8) PROJECT DEPTH TO RIGHT SIDE VIEW MITER LINE TOP RIGHT FRONT
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 HIDDEN LINES ON TWO VIEWS • INCLUDE CENTER LINES ON ALL VIEWS
Quiz 1) WHICH VIEWS ARE MOST OFTEN USED TO DESCRIBE AN OBJECT IN A TECHNICAL DRAWING, ALSO REFERRED TO AS THE NORMAL VIEWS? A) FRONT, REAR AND RIGHT-SIDE B) FRONT, TOP AND LEFT-SIDE C) FRONT, TOP AND RIGHT-SIDE D) 3D VIEW
Quiz 2) WHICH VIEW SHOWS THE WIDTH AND HEIGHT OF AN OBJECT? A) FRONT B) LEFT C) RIGHT D) TOP
Quiz 3) THE VIEWS THAT MAKE UP MULTIVIEW DRAWINGS ARE DEVELOPED THROUGH _______________ PROJECTION? A) ORTHOGRAPHIC B) PHOTOGRAPHIC C) PICTORIAL D) TECHNICAL
QUIZ CREATE A MULTIVIEW DRAWING OF THE SHAPE BELOW:
Level of understanding: 1, 2, 3 • AT THE BOTTOM OF YOUR NOTES PAGE, ON THE BACK, CIRCLE 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/MOSTLY UNDERSTAND • 3: I GET IT, LETS MOVE ON TO SOMETHING MORE CHALLENGING
Multiview Group activity • THERE WILL BE THREE DIFFERENT GROUPS: • STUDENTS WHO NEED ASSISTANCE (1) • STUDENTS WHO UNDERSTAND (2) • STUDENTS WHO ARE READY TO MOVE ON TO HARDER ASSIGNMENTS (3) • EACH GROUP WILL BE GIVEN A BOX FULL OF 3D SHAPES • GROUPS 2 AND 3: WILL BEGIN CREATING MULTIVIEW DRAWINGS BASED ON THOSE SHAPES IMMEDIATELY AFTER GETTING IN TO GROUPS • GROUP 1: I WILL MEET WITH YOU AND PROVIDE INSTRUCTION ON YOUR ACTIVITY. YOU WILL HAVE A REFERENCE SHEET AND COLOR CODING OF VIEWS ON SHAPES. • GROUP 3: AFTER MEETING WITH GROUP 1, I WILL COME AND SHOW YOU HOW TO CREATE ISOMETRIC DRAWINGS OF THE 3D SHAPES • GROUP 2: AFTER MEETING WITH GROUP 2, I WILL MAKE SURE YOU ARE GOOD WITH YOUR ACTIVITY AND SHAPES.
