Manufacturing Processes And Techniques 1 Flashcards
Why model?
For: Ergonomics Aesthetics Functionality Feasibility Proportions Scale/size Testing mechanisms and components
In long run it saves time, reduces manufacturing costs and avoids mistakes
Materials for modelling
- plastic
- styrofoam
- wood
- clay/plasticine
- paper/card
- metal wire
- polystyrene
- breadboard
2 modelling processes
- subtractive manufacturing process: making multiple components to assemble into the model by carving/sculpting
- CAD/CAM: for complex models
What are iterations
Repeats
processes of making
- fabrication
- additive
- casting
- subractive
- forming
- moulding
digital simulations
- designing products digitally
Advantages:
- design alterations are immediately visible
- product visible from all sides
- removes the need of physical prototypes
- new ideas can be tried quickly and changes can be visualised
- used to test circuits and mechanical devices: saving money and time and expensive parts
- stresses on individual components can be predicted and parts can be strengthened
Additive modelling processes and rapid prototyping
e. g. 3D printing
- allows designers to produce innovative designs that are complex to manufacture and can be produced at a fast pace
- different base materials: powder/liquid
- different processes: SLA(stereolithography), MJM (multi-jet modelling), SLS (selective laser sintering) and FDM (fused deposition modelling)
advantages:
- can program and build a part rapidly minimising cost and time
wasting/subtracting
removes or cuts away material to leave the desired shape
what is important while drilling
- drilling speeds are important
- larger the drill, slower the speed
- use a jig
kerf
width of the cut
must be wider than blade to avoid sticking
- avoided by setting teeth to left/right
snips/shears
- used to cut thin metal sheets/ soft polymers
types of saws
- back saws
- frame saws
- hand saws
- other
bandsaw / circular saw
- used by technicians or teachers
- to cut and prepare wood
- used in manufacturing industry
scroll / hegner
- fixed saw
- for intricate shapes on thin sheets
jig saw
- portable
- cuts curves
power hacksaws
- for bars of metal and polymers
examples of hand saws
- cross cut saw (used on large sections of wood when cutting across grain)
- panel saw (cutting panels in large sheets of wood)
- rip saws (cutting/ripping down grain on large sections of wood)
examples of back saws
- tenon saw (wood)
- dovetail saw (smaller for accurate works, back limits cut)
examples of frame saws
- coping saw (curves in thin sectioned wood)
- hacksaws (metal, fine blade)
- piercing saw (metal, finer blade used for jewellery)
Turning
- when the wood, plastic or metal is turned
- the material can be held using a faceplate or between the centres for slimmer items
- different lathes: wood working, centre, copy
- three jaw self-centring chuck, four jaw independent chuck