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Additive Manufacturing (Selective Laser Sintering (SLS) (SLS machine…
Additive Manufacturing
Selective Laser Sintering (SLS)
A process which uses laser to selectively to trace the surface of powder and sinters the material
SLS machine
Computer/Control
PC with window OS
prepares the .stl files
Slices the parts
Monitors and controls the entire building process
Atmosphere control
Houses equipment to filter gas recirculated from the process chamber
Maintains a set temperature on the air flowing into the process chamber
Regulates the nitrogen atmosphere used in the unit
Process chamber
Optics and scanning mirrors are used to focus the CO2 laser onto the part cylinder
Characteristics of SLS parts
Amorphous Materials
Rough surface finishes and porous
Advantages of SLS
Ability to provide self support during building
No elaborate supports need to be built such as some in photopolymer systems.
Un-sintered powder surrounding the part in the build cylinder acts as natural supports
Stereolithography (SLA)
CAD to SLA
CAD output STL
Geometry is sliced into layer
Generate support
Start layer by layer processing
Fused Deposition Modelling
Design for FDM
Need of support
Feature overhung more than 45 degrees will need "support"
Bridge
Bridge exceeds 5mm will result in sagging or marks from support material can occur
Horizontal Hole
Support will be added when there is a vertical hole, and may be difficult to remove if the hole is small
Filament
PLA (Polyactic Acid)
Non-toxic
Easy-to-print with minimum warping or curling
ABS
Can withstand higher heat
Tougher than PLA
Prone to warping