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Introduction
CAN YOU OVERCOME 95.8 POUNDS OF PRESSURE?
 
This team has
set the height of the bar, to which you must reach to compete!
This bridge was
designed and constructed during the second half of the first marking period, at
Indian Valley Middle School, in the technology education department.
The bridge was produced by
Jordan Bell &
Nathan Coppenhaver of the
8-2 team, the
next closest bridge went to pieces under 43.6 pounds of pressure.
THIS IS THE MISSION IF YOU DECIDE TO ACCEPT IT!
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The Task
THE
MISSION
Design and Produce a Balsa Wood Framed Bridge
as a Business
Partnership
3 inches high
x
3 inches wide x
8 inches long
withstand at
least 10 pounds
attempt to
surpass 96 pounds
Is this
Mission
Possible?
or
Mission
Impossible!
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Process
STEP (1)
Using 1/8" graph paper each student, individually must produce a rough draft of
a
(3" wide x 3" high x 8" long) balsa wood frame bridge.
The bridge must be constructed with no more than 20' (240") of 1/8" x 1/8"
square balsa wood stock, and no less than 16' (192") of 1/8" x 1/8" square balsa
wood stock. The rough drawing will only be of the front view of the bridge and
the graph paper will also be used to do the math calculations for the amount of
stock needed to produce the bridge.
STEP (2)
Produce a to-scale measured
three-view drawing with, front, top, and right side views on a 12" by 18" white
cotton finish drawing paper, and a bottom positioned title block.
[ IVMS
Section Start Date ] [ Bridge Drawing ] [ Designers Name
End Date ]
STEP (3)
Match up with a
classmate and form a bridge construction business, that is set up as a
partnership.
Set up your first partnership meeting, with the task of reviewing and discussing
the use of one or the others bridge design as the stepping stone to producing the
company's first bridge.
The partner whose bridge design is chosen for the project will become the
project manager, or the BOSS, and the other partner in the project will
become the laborer during the job.
The manager partner will be the designer, foreman, and gluer of the bridge
project.
The laborer partner will transport, cut, and inventory all of the wood and
material needed for the construction of the bridge.
STEP (4)
The project manager will send
the laborer to the TechEd Supply Company to pickup 20' of 1/8" square balsa wood
stock, a balsa wood box saw, a utility knife, an 8oz. bottle of green wood glue,
and a 12" by 18" piece of wax paper, and transport them back to the job site.
STEP (5)
The partners will
create a job site by laminating the designer partner's bridge drawing, and add a
sheet of wax paper to protect the area, this will become the partnership's
mobile job site, where the bridge will be constructed.
On the job site the 20' of balsa wood will be stored and all the gluing of the
wood will be done, also masking tape can be used to hold the wood in place while
glue is drying.
STEP (6)
When the bridge project is
completed, it will be tested on a Netex Digital Bridge Tester, which will test
the bridge to the nearest hundredth of a pound. The bridge will be graded by
the amount of weight it holds and the business partner will share the same grade
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Evaluation
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Bridge
Project Rubric |
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Poor
(1) |
Average (2) |
Good
(3) |
Excellent (4) |
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Graph
Paper
Rough Draft |
Inaccurate Design
making use
of less
than 192" |
Design
making use of
192" to 209" of Materials |
Accurate Design
making use of
210" to 230" of Materials |
Precise Design
making use of
231" to 240" of Materials |
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3-View Finished Drawing |
Drawing,
Straight Lines
more
than 22 errors |
Finished Drawing,
Some
Difference in Line Weight, 15 to 22 errors |
Accurate Finished Drawing,
Good Line
Weight, 8 to 14 errors |
Precise Finished Drawing,
Accurate, Precise Line Weight, less than 7 errors |
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Formation of
Partnership |
Unorganized Job Site,
Partially stocked, Unequipped, Minimum Construction |
Job Site,
Semi Stocked, Semi Equipped,
Steady Construction |
Organized Job Site,
Stocked,
Neat, Equipped, Motivated Construction |
Highly Organized Job Site,
Fully Stocked, Neat, Fully Equipped, Highly Motivated Construction |
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Construction
of Bridge |
Excessive
use of Glue, Minimum Constructed, Inaccurate Cuts, Loss Fitting Joints and
Laminations |
Finished,
Adequate
use of Glue, Constructed, Average Cuts, Average Fitting Joints and
Laminations |
Accurate,
Good use of
Glue, Steady Constructed, Accurate Cuts, Good Fitting Joints and
Laminations |
Precise, Minimum use of Glue, Strong
Constructed, Precise Cuts, Tight Fitting Joints and Laminations |
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Testing of
Bridge |
Hold Less than
10 Pounds, or Lower 20% of the
Class |
Hold 10 to 24
Pounds, or 40% Lower Middle of Class |
Hold 25 to 39
Pounds, or 40% Upper Middle of Class |
Hold 40 Pounds
or More,
or Top 20% of the Class |
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Conclusion
After you have
completed all of the tasks or activities in the section above, you have
completed the webquest assignment. At this point I would like you to go back
over your work and check that you completed every task, that your were assigned.
After you have check that every activity has been fully and accurately finished,
this completion of the task and recheck of the tasks should give you a complete
understanding of the concepts of the bridge project.
(1) The thought
process of designing a strong bridge, with an efficient use of the allotted wood
stock provided.
(2) The concept of transferring a rough design to an accurate, neat, and
finished three - view drawing.
(3) The concept of forming a business partnership, and dividing the work duties
and responsibilities between the partners.
(4) The concept of constructing a bridge accurately, and controlling an
organized job site.
(5) The importance of completing the bridge project in a timely manner to be
ready for testing on the assigned date.
(6) How the bridge was completed, so that it bares the weight needed to
obtain the highest possible grade.
After completing the bridge webquest project, and if you are interested in
expanding your knowledge and experience in balsa wood projects, you may elect to
take an additional Technology Education class in high school, or join the (TSA)
Technology Student Association at Indian Valley Middle ort High schools.
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