2ProblemStudents will use the engineering design process to design and build a cardboard chair. The teacher will sit in the chair for at least 90 seconds.Final products:Engineering design portfolio (need not be typed)¼ scale chairCardboard chair
3Requirements Students will work in groups of four Assign each member a dutyMember Name - Design EngineerMember Name - Document handlerMember Name - ResearcherMember Name - Material handlerDecide on a group name – relate to the project (ex: CardChairs R Us)
4Requirements: Constraints: 2 sheets of cardboard ~ 7’ x 3.5’ Chair must have a backSeat of chair must be at least 18” off the floor.Constraints:Students will not use any form of adhesives to build the cardboard chairNo glue, tape, staples, nails etc.
6Center of GravityA structure remains standing only if its center of gravity is directly over the perimeter of its base.Center of Gravity
7Loads and Joints 1. What is a load? What is the load on a chair? What is a static load?What is the static load on a chair?What is a dynamic load?What is the dynamic load on a chair?What are joints?How can one take care of weak links?Why do most chairs fail?10. What does orthotropic mean?11. Give an example of orthotropic material.12. How would you cut cardboard?
8Orthotropic Material What does orthotropic mean? Give an example of orthotropic material.How would you cut cardboard?
9Research Go to the Cardboard chairs websites from Ms. Gala’s website. Watch videoRead about cardboard chair designsGoogle image search on cardboard chairs
10Alternative Solutions Each student in a group sketches three chairs you may have at home or school.ex: dining chair, sofa chair, office chair, deck chair, lawn chair, etc.Think about form, comfort, looks etc.Sketch ideas for cardboard chair.Use graph paper
11(copy definition) Orthographic Drawing – sketches made in two dimensional views. Objects can be seen from the front, top, side and back.
12Measure your classroom chair (inches) Fill in the chart provided. This will give you an idea about chair dimensions.Standard Classroom chairLengthHeightWidthBack of chairChair seatLegs or base
13Plan on measurements for cardboard chair (inches) Fill in chart. Convert all measurements to ¼ scale. Divide each number by 4. Write ¼ scale number in parenthesis.Your Cardboard ChairLengthHeightWidthBack of chairChair seatLegs or base
14Final Design Use graph paper, ruler and pencil Orthographic drawings – front view, side view and top viewShow measurementsScale 4” – 1”18 inches
15¼ scale chairs Refer to the orthographic drawing Use one sheet of poster paperDraw and cut out patterns to build a ¼ scale chair.Remember no adhesives or attachements of any type
16Full Size Chairs First draw patterns on the cardboard sheets Minimize use of materialUse gloves, base cardboard mats and box cuttersScore cardboard to make sharp foldsCut slots that are straight and parallel to make tight joints