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HEAD BANGERSFinal report
Compiled by:
Robert Barendilla S209914904
Daniel Basson S2053845
Thanyani Murundwa S209919086
Sanele Mxoli S209404547
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Contentsy Main Objectives....Pg1
y Requirements...Pg1
y Constrains.Pg2
y Concept selection..Pg3
y Parts list.......Pg4
y Price list.......Pg5
y Estimated weights.Pg6
y Materials and calculations.Pg6
y AppendixA-Linear responsibility chart, Gantt chart, Evaluation
matrix, Schedule calendar
y Appendix B-Exploded isometricand 1st/3rdangle drawings
y Appendix C-Minutes of Project plan meeting
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Main objectives;
Students are required to design a vehicle that will compete in a series of races and tests
of durability and endurance. The vehicle will advance down a two meter track and no
external controls or assistance to motion is given to the vehicle once activated. Students
work in groups of four and they delegate the workload according to individual skill set.We will design concepts of the vehicle and compile a final draft of the vehicle based on
constrains as detailed later in the report. This will test the members of the group in the
processes of engineering and designing concepts, material selection and final assembly
of the vehicle.
REQUIREMENTS:
Initial Requirements
- 3 hand sketched vehicle concept drawings
- Evaluation matrix
- Linear Responsibility chart
- Gantt chart
Drawing Requirements
- An explode view isometric assembly drawing is required including the:
1. Body
2. Chassis(motor, battery, switches, gears)3. Wheels
4. All assembly parts to be labeled with assembly number
5. All dimensions and tolerances to be shown of non purchased parts and
purchased parts that have been modified
- Parts list showing the weight each part
- Parts list showing the estimated price of each part
- Drawing views
1. 1st angle drawing of vehicle
2. 3rd angle drawing of vehicle
Calculations
- We are required to estimate the speed of the motor in revs/min by timing a run of
the vehicle
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Constraints:
- Only four or less students are to build a vehicle for the head bangers 2011
project for machine design 2.
- Only one 9-V DC battery can be used for all the races that the team will
participate in.- The vehicle has to race down the race track and back only by a on and off switch
on the vehicle itself.
- The vehicle is to be switched on, move forward, hit the wall, shift from forward to
reverse on its own and race back the track to finish the race.
- The vehicle may not be control by any external controls once the switch on it has
been activated.
- The vehicle must not exceed 300mm in length once it is on the race track.
- The whole vehicle is to be built from bottom to top and no purchased vehicle may
be used as it is, only parts like motors, wheels, small gears may be used into thebuilt vehicle.
- The chassis of the vehicle is to be built as an original and no purchased chassis
may be used.
- Only DC electric motor may be used and more than one motor may be used.
- The vehicle is to be built that it may only move as a single unit.
- No slingshot anchor-type vehicle may be used also a ball that can be thrown
down the race track.
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Parts list
Part Qty Description
Chassis 1 Polyethelene
Bumper 1 Aluminium
Wheels 4 Rubber
Mag wheels 4 Polyethylene
Axel 2 Aluminium
Bearing blocks 2 Polyethylene
Battery 1
Bumper block 1 Polyethylene
ISO 4014 - M3.5 x 20 2 Hexagon head bolt - Product grades A and B
ISO 4014 - M2.5 x 20 8 Hexagon head bolt - Product grades A and B
ISO 4032 - M3.5 2 Hexagon nuts, style 1 - Product grades A and B
ISO 4032 - M2.5 8 Hexagon nuts, style 1 - Product grades A and B
Switch stand(Toggle) 1 Aluminium
Switch-stand(On/off) 1 Aluminium
Toggle switch 1
On/off switch 1
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Price list
Combined costs Of Vehicle (Rands)
Motor R128.95
Batteries R45.95
Complete chassis manufacturing cost R345.00
Wheels R60
Toggle Switch R80
On/off Switch R20
Gear Train R105
Total R784.90
Price paid by Each Member of the group R196.25
y Prices Quoted from The RC SHOPAt 6th
Avenue Walmer Shopping centre
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Car weights
Actual weight of car 2.0kg
Estimated weight of parts
Chassis(Including all polyurethane parts) 0.9kg
Wheels 0.2kg
Axle(shafts) 0.1kg
Electrical mechanisms(switches, wires) 0.3kg
Gearbox and motor 0.5kg
Materials used
Chassis, blocks Polyurethane
Bumper, shaft Aluminium
Wheels Rubber
Calculations
We ran the car over a 5 meter length and timed it to 2.35 seconds. We calculated
the linear speed of the car to be 2.13 m/s.
V =
V =
= 2.13 m/2
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Wheel diameter 0.046m
=
=
= 92.61 rad/s
=
N =
=
= 884.36rpm(wheels)
VR =
=
= 1.714
RPM motor = RPM wheel x VR
= 884.36 x 1.714
= 1515.79 rpm
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Appendix BCharts
Linear Responsibility ChartNo Tasks Danie Robert Sanele Thanyani
1.0 Management
1.1 Overall leadership 1 2 3 3
1.2 Team meeting minutes 1 3 3 2
1.3 Financial accounts 1 2
2.0 Procurement
2.1 Motor 3 1 2 3
2.2 Gears 3 3 1 22.3 Chassis 2 3 3 1
4.0 Electrical
4.1 Circuit design 3 1 3 1
4.1.1 Build and test circuit 2 1 3 3
4.2 Add circuit to chassis 1 2 3 3
5.0 Drawings
5.1 Concept sketches 3 1 2 3
5.2 Initial 3D drawing 3 3 1 2
5.3 Final drawing 3 3 1 2
5.3.1 Individual parts 3 3 2 1
5.3.2 Scenes, 3D isometric 3 1 3 2
5.3.3 Parts list 3 2 1 3
6.0 Construction
6.1 Build chassis 1 2 3 3
6.2 Assemble drive train 3 2 3 1
6.3 Assemble electronics 3 3 1 2
7.0 Testing7.1 Test assembled car 1 3 2 3
7.2 Modify and re-test 3 2 3 1
8.0 Final report 1 1 1 1
1. Primary responsibility 2. Secondary responsibility 3. Review
Changes to chart
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Appendix CMinutes of Project plan
meeting
1st REPORT Minutes
Agenda/Subject: Head bangers meeting regarding first practical report.
Date : 25 February 2011
Time : 12:30
Attendees: Robert Barendilla, Thanyani Murundwa, Danie Basson, Sanele Mxoli
To ensure that all the requirements of the first report could be met. It was decided that
each team member must free hand sketch a chassis of a battery operated vehicle. This
drawing must show all relevant parts of the vehicle such as drive train, motor, wheels
and switches based on their own individuals designs and concepts. Three of the four
chassis design concepts will be used for the first report.
The following tasks were handed out to the relevant team members. They are as
follows:
y Robert Barendilla :The requirements section for the report and the responsibility
chart,y Thanyani Murundwa : The constrained section.
y Danie Basson: Gantt chart and Minutes.
y Sanele Mxoli: Objectives and Evaluation matrix.
Conclusion
All relevant team members must hand in their tasks on the 02March 2011
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2nd REPORT MINUTES
Agenda/Subject: Head bangers meeting regarding second practical report.
Date: 22 March 2011
Time: 12:25
Attendees: Robert Barendilla, Thanyani Murundwa, Danie Basson, Sanele Mxoli
What we as group 5 agreed upon is that every member must make a chart that are
required for the second report. Each group member was given a week to make sure that
the task that they had to do, Should be done in the correct manner. Also every member
within the group must make sure that they bring their work at the team meeting that
followed.
The following tasks were handed out to the relevant team members. They are as
follows:
y Robert Barendilla Linear responsibility chart,
y Thanyani Murundwa: Calendar, Meeting Minutes.
y Danie Basson: Gantt chart.
y Sanele Mxoli: Price list and evaluation matrix.
Conclusion
All relevant team members must hand in their tasks on the 22 March 2011
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