Transcript Sample Battery Car Design Document

23rd ANNUAL BATTERY CAR RACE
FEB. 27,2015
Car Name: THE ROAD RUNNER
BY: Homer Johnson & Sammy Smith (Ingomar Middle School)
(Picture of car
here)
DESIGNS & Dimensions
Frame
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Motor &
Supports
Battery Pack
Axle Bearings
Eyelets
Body
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Hood
Roof
Triangular
Supports
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{
MATERIALS
● BALSA WOOD
o 1 piece -⅛” x 3” x 7”;
o 1 piece - 1/16” x 3” x 6”;
o 1 piece - 3/16” x 2” x 3”;
o 1 pieces triangular ⅜” x ⅜” x 6”;
o 1 piece ⅛” x ¼” x 4”
● HOT GLUE
● SUPER GLUE
● SOLDER
● ALLIGATOR CLIPS (2)
● ZIP KICKER CA ACCELERANT
MATERIALS (cont.)
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2 GEARS -1 ¼ ” and 1”dia.
4 WHEELS - 1 ½” dia.
2 WHEELS - (any dia., only hub needed)
X-ACTO KNIVES
2 RUBBER BANDS(for tires) - 1” dia.
MOTOR
BATTERY PACK (AA BATTERIES)
2 METAL AXLES - 5” and 3”
2 PLASTIC AXLE BEARINGS - 1”
2 EYELETS
2 SCREWS - #4 x ⅝”
ASSEMBLY
Frame Assembly
1) Measure and cut frame from ⅛” balsa per diagram
2) Measure and cut body from 1/16” balsa per diagram
3) Cut 4 pieces of triangular balsa, 1 ½” in length each
4) Cut 2 pieces of ⅛”x¼”, 1 ⅝” in length each
5) Measure and mark position for triangular motor supports,
battery pack, axle bearings and eyelets
6) Solder alligator clips onto battery pack leads
7) Push 1 ¼” gear onto motor rotor
8) Use CA glue and accelerant to glue triangular supports for
motor to frame
9) Use hot melt glue to attach motor onto frame and supports
(3 sides) and to attach battery back to frame
(continued on next page)
ASSEMBLY (cont.)
Frame Assembly (cont.)
10) Use CA glue and accelerant to attach axle bearings to frame
(put 1” gear onto axle, insert axle through bearing, and
verify position by meshing gear with motor gear while
holding bearing against the frame)
11) Cut hubs off of extra pair of wheels, and cut each in half to
provide 4 axle retainer rings
Front axle assembly
12) Slide 1 wheel onto front axle, followed by 1” gear, and 1
retainer ring, then slide axle through axle bearing
13) Slide 1 retainer ring onto opposite side of axle followed by
second wheel and then adjust spacing for alignment
14) Slide rubber bands over both front wheels for traction
ASSEMBLY (cont.)
Rear axle assembly
15) Slide 1 of the wheels onto the rear axle, followed by 1
retainer ring, then slide axle through rear bearing
16) Slide 1 retainer ring on opposite side of axle followed by
second wheel and adjust spacing for alignment
Body and final assembly
17) Use CA glue and accelerant to attach triangular section to
3/16” balsa, attach to body panel (cut from 1//16” in step
2), and then attach the ⅛”x¼” supports
18) Use CA glue and accelerant to attach last triangular support
to front of frame as shown in diagram
19) Carefully use screws to attach body assembly to the
triangular support
20) Attach eyelets where shown
21) Connect alligator clips to motor and turn on motor to run
CREATIVE FEATURE
One creative feature that helps the Road Runner function is the way we held
the motor in place. Instead of just gluing it on the wood, we glued 2
triangular shaped pieces of balsa wood onto the frame. This gave us more
surface area to attach the motor. This helps our car’s performance because
our motor is less likely to move. When the motor is more stable, the gear will
remain in contact with the gear on the axle, which turns the drive wheels.
The reduced vibration improves the transfer of power to the drive wheels.
OBSTACLES
Problem
One difficult obstacle we faced was that we struggled to keep the axle
from sliding around in the axle bearing causing steering and stability
problems. We tried using drops of hot glue to keep it from sliding. At first
the axle didn’t slide, but eventually the dots popped off because they were
either rubbing on the frame or they could not withstand the pressure on them
from the axle trying to slide.
Solution
After a lot of experimenting, our final solution
was to take two extra wheels and cut off the part that
holds the axle. We then cut those in half so that we had
4 pieces. We then attached those to the axle and slid
them into place. That stopped the axles from sliding.
PICTURES
Top view of the The Road
Runner with body
Front view of car before
body is attached
Us holding the Finished
Road Runner
Top view of the The
Road Runner without
the body
Side view of finale
Road Runner
A Road Runner in
its natural habitat
Image of the completed
Road Runner
Our starting supplies,
not including the solder
related supplies and
extra wheels