JJ513-Engineering Design
JJ513-Engineering Design
JJ513-Engineering Design
1 Functionality
2 Strength/stress
3 Distortion/deflection/stiffness
4 Wear
5 Corrosion
6 Safety
7 Reliability
8 Manufacturability
9 Utility
10 Cost
11 Friction
12 Weight
13 Life
14 Noise
15 Styling
16 Shape
17 Size
18 Control
19 Thermal properties
20 Surface
21 Lubrication
22 Marketability
23 Maintenance
24 Volume
25 Liability
Design
can
Power to be delivered: 20 hp
Input speed: 1750 rev/min
Output speed: 85 rev/min
Targeted for uniformly loaded applications, such as conveyor
belts, blowers,
and generators
Output shaft and input shaft in-line
Base mounted with 4 bolts
Continuous operation
6-year life, with 8 hours/day, 5 days/wk
Low maintenance
Competitive cost
Nominal operating conditions of industrialized locations
Input and output shafts standard size for typical couplings
Power to be delivered: 20 hp
Power efficiency: >95%
Steady state input speed: 1750 rev/min
Maximum input speed: 2400 rev/min
Steady-state output speed: 8288 rev/min
Usually low shock levels, occasional moderate shock
Input and output shaft diameter tolerance: 0.001 in
Output shaft and input shaft in-line: concentricity 0.005 in, alignment
0.001 rad
Maximum allowable loads on input shaft: axial, 50 lbf; transverse, 100 lbf
Maximum allowable loads on output shaft: axial, 50 lbf; transverse, 500 lbf
Base mounted with 4 bolts
Mounting orientation only with base on bottom
100% duty cycle
Maintenance schedule: lubrication check every 2000 hours; change of lubrication
every 8000 hours of operation; gears and bearing life >12,000 hours;
infinite shaft life; gears, bearings, and shafts replaceable
Access to check, drain, and refill lubrication without disassembly or opening of
gasketed joints.
Materials Selection
The designer of any product, other than software must
How do we decide?
How do we begin to choose?
Product Analysis
Just what it says analyse the product!
What does it do?
How does it do it?
Where does it do it?
Textbooks
Manufacturers literature
Internet Sites
functional viewpoint.
2. Decide on the materials to be used.
3. Choose a suitable process that is also economic
4. Is the product performance driven or cost driven?
This makes a huge difference when choosing materials
Drink Container
health hazards.
For fizzy drinks, withstand pressure.
Brand image & identity
Easy to open
Easy to store & transport
Cheap for high volumes
Steel
Aluminium
Glass
Plastic