Gearbox design and build

Presenter:Anna , Sam, Adrian, Jeffery

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

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

Relevance and Effectiveness

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

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

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

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

Novelty

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

Existing problem and solution

Frictional force on the surface

Sand Paper and graphite powder as a solution

Backup plan

Elegance

Internal Elegance

Calculations

Aesthetics of the Calculations

Dictate the end product both in design and perfomance

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