md presentation version 3.5
TRANSCRIPT
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Gearbox design and build
Presenter:Anna , Sam, Adrian, Jeffery
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1. Anna - significant design problem and consideration of our gear box.
2. Sam - corresponding to the existing problem, compare other design, configuration about the gear train.
3. Adrian - improvement of the project, discuss problem of the existing design, plan our project and eliminate the negative effect.
Role of Distribution
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lift up 8kg weight which attaches to the gear box under a certain height
Consider the output of the gear box
Assume the motor is running the maximum power
Consider the size of the carrier which attach to the last gear of the gear train
Scope
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Relevance and Effectiveness
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Constraints Various factors that impact performance of gear box
Property of material is one of primary concerns
Gear box has to fit within task constraints
Task constraint is material provided, 3mm thick sheet of Acrylic
Many common gear types in the industry
Helical, Bevel, Worm and Spur gears
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Ideal would be bevel gear because: High efficiency Plastic bevel gears work perfectly well
Cannot be made due to material constraint
Only have one option, Spur gears
Many pros and cons about spur gears Advantages: Simple, inexpensive, efficient, easy to assemble Main advantage: It can actually be made from sheet of acrylic Disadvantage: Produce a lot of noise
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Considerations Need lubricant during testing process
2 Main types of lubricant: wet and dry Graphite Powder
Good at reducing wear and friction
Can cause corrosion in metal
Much cleaner than wet lubricant
May optimize performance of the gears
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Weight force of mass in torque formula r = radius of the gear rope/string is attached to Keep torque small, r has to be small as well
Size of the carrier depends on size of last gear
Carrier collects string windup
Cannot directly attach string to the main gears
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Novelty
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Gear train comparison► Compound gear train and planetary gear train
► Simplicity
► How to achieve to the same performance as planetary gear train?
Pressure angle in 20ْـ Number of teeth must be greater than 20 Locator is installed Module is 1
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Existing problem and solution
Frictional force on the surface
Sand Paper and graphite powder as a solution
Backup plan
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Elegance
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Internal Elegance
Calculations
Aesthetics of the Calculations
Dictate the end product both in design and perfomance
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External Elegance
The perfect Design for the perfect world
The locking mechanism : the design is effective in both calculation and aesthetics, in which it is easy to assemble and easy to replace any part that has failed in design or amends
Components are interchangeable