2. Methods

2. Methods
2.1 Equipment List

For the Base
Cardboard (Dimensions in cm)-
1 piece 30 * 10
2 pieces 10 * 10
4 pieces 10 * 9.9
4 pieces 9.9 * 9.8
Tape/Glue(Preferably tape as glue take time to dry)

Electrical Components
Wires (with alligator clip ends)- 12
Mabuchi FA 130 Motor(12V to run)- 2
Reliable Power source(e.g. Batteries, Small Power Supply, etc.)- 12 V of voltage
(Tape/Glue down electrical components that go on the bridge for stability)

For the Bridges
Cardboard (Dimensions in cm)-
1 piece 5 * 16(If necessary get 2 pieces, one for the Rolling Bascule Bridge and one for the Vertical Lift Bridge)
2 pieces 5 * 8
2 pieces 20cm
(Only use tape to attach anything to the motors)

2.2 Diagrams of experimental setup

Figure 1: Dimension of the base itself

2.3 Procedures

Diagrams for reference can be found here:


Building the base:
Glue cardboard pieces (found in Fig 1.2) together according to Figure 1.1
a. The 30cm by 10cm piece will be the bottom.
b. To form a cube, assemble the other cardboard pieces according to figure 1.3.
Form two cubes (one on each side of the 30cm by 10cm piece)
c. Attach wiring, battery and motor according to figure 1.4
Attach Motor on top of the cube near the edge of where the bridge will be.
Attach Battery anywhere convenient near the bridge but not on it.
Connect both Motor and Battery with wiring.
Repeat with other cube on the other side of the base.
Bridge types:
Bridge 1 (Rolling Bascule Bridge)
One long ledge fixed to one edge of the abutment rotating about an axis on the abutment itself
Bridge 2 (Bascule Bridge)
Two shorter ledges each attached to the other abutment rotating on an opposite axis.
Bridge 3(Vertical Lift Bridge)
A long ledge lifted and lowered along two towers

Refer to Figure 1.5 for how the bridges will be attached to the motor
Attaching wires:

(d) Procedures for testing: Detail all procedures for testing of prototype
(For Bridge 1 and 2) Attach Bridge to the motor(s) on the base using tape. (You might be able to further secure the bridge using binder clips if they are available but the bridge will not be able to go as high)
(For Bridge 3) Attach the sides of the bridge to one string each on the base using tape/glue. Attach it in such a way that you have an end from each string that is free. Attach the free end to the motors. (You might be able to further secure the bridge using binder clips if they are available but the bridge will not be able to go as high)
Lift and lower Bridge (1 cycle).
Record Voltage(V), Electrical Current(A) and Time(s).
(How to use a multimeter to find current: https://www.youtube.com/watch?v=7lwZkl0yBqA
How to use a multimeter to find voltage: https://www.youtube.com/watch?v=-NJPUXC2frQ&hl=en-GB&gl=SG)
Repeat Steps 2 and 3 until 3 cycles done in total.
Repeat steps 1-4 Bridges 2 and 3

2.4 Risk Assessment and Management


Electrical shocks may occur from the wiring
Avoid touching the exposed part of the wires
Do not turn on electricity while still holding wires
Binder clips may pinch
Try to minimize close contact with the clamping edge
Penknife/Scissors needed for cutting cardboard is sharp and may cut
Cut in direction away from self
Walk with penknife/scissors’ sharp edge facing the floor
If dropped, do not try to catch.
Edges of the cardboard is sometimes sharp and can cut.
Avoid handling the cardboard by edges. Edges can be covered by tape to dull them

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