cad/cam in schools initiative in schools initiative . ... pro/desktop 3d solid modelling sept 1999...
TRANSCRIPT
digital design & technology
John LeeJune 2009
CAD/CAM in schools initiative 10 years on ...... where are we now?
digital design & technology
what is CAD/CAM?
Food TechnologyProduct DevelopmentData loggingNutritional AnalysisPackaging Design
EngineeringDesign & developmentRapid prototypingVirtual testingDATA managementProduction scheduling
Textiles TechnologyProduct DevelopmentDigital printingLayout/patternsCAM
Product DesignProduct DevelopmentRapid prototypingCAMMarketing materialsPackaging Design
Systems & ControlCircuit design/testingInstrumentationPCB design/manufactureCAM
Graphic ProductsData presentationDesk top publishingPackaging DesignModellingMarketing
digital design & technology
CAD/CAM in Schools Initiative : 1999 to present
Aim : to modernise the design and technology curriculum through CAD/CAM
Pro/DESKTOP 3D solid modelling Sept 1999 – (currently 10,000 + teachers accredited)
ArtCAM 3D art & design modelling Dec 1999 – (currently 961 teachers accredited)
Speedstep textile design 2002 – (currently 1195 teachers accredited)
Pro/ENGINEER advanced 3D solid modelling Oct 2007 – (currently 757 teachers accredited)
digital design & technology
professional software
high quality images & products
motivational across ability
range
raising profile of
D&T
supported self study
transferable skills
strengths & opportunities
CAD/CAM in Schools
digital design & technology
the big issues!
effective teaching & learning strategies
integration into the product
development process
resourcing developments
building in progression
assessment of outcomes
de-skilling?
technical support & maintenance
digital design & technology
3D CAD
laser cutter
3D CNC manufacture
rapid prototyping
rapid / soft tooling
injection mould tooling
2D/3D design
rendered presentations
STL export
configurations
engineering drawing
2D CNCmanufacture
animations
CAD/CAM pathways
2D CAD
digital design & technology
computer aided manufacturing pathways
material ‘wastage’
eg. cnc manufacturespark erosionwaterjet cutting
material addition
eg. LOM modellingfused deposition modelling
material remoulding
eg.injection mouldinggravity die castingsilicone tools/moulding
digital design & technology
3D CNC manufacture : router / miller / lathe3D CNC manufacture uses a router, miller or lathe to convert 3D CAD data into 3D physical forms. This is a ‘subtractive’ process where the final form is created by removing waste from a billet of material.
3 main types of 3D CNC output :
Production partsthe finished component is made in the end use material.
Prototyping a developmental model is made, mainly to evaluate the design as it progresses
Toolmakinga ‘tool’ is created from which a batch of components can be moulded or formed.
3D CAM : 'wastage' processes
digital design & technology
3D CAM strategies
3D form developed in CAD software
3D form machined on router / miller
vacuum formed casings
produced
toolmaking 1 : producing a 'plug' for plastics forming (press/vacuum)
digital design & technology
3D CAM strategies
toolmaking 2 : producing mould tools
moulded forms batch produced
mould tool manufactured on CNC router
Desired 3D form developed in CAD software
’use component’, ‘intersect’ or similar is used to create mould tool(s)
digital design & technology
toolmaking 3 : producing a silicone soft tool
3D CAM strategies
CNC manufactured prototypes used to producesilicone soft tools - tools produced for smallproduction quantities of parts in the end use material.
normally associated with low cost prototype production
digital design & technology
allows for manufacture ofcomplex shapes in full 3D
allows both sides of a part to bemachined
parts can be manufactured in ‘end use’ material
3D CAM strategies
2 stage 3D manufacture : ‘top’ and ‘bottom’
digital design & technology
3D PrintingParts made by curing a starch based powder.
Speed is an important benefit of this technology; many models can be produced in minutes rather than hours or days.
The 3D printing process is faster and cheaper than FDM
The completed models can be used :as limited functionality prototypes concept evaluation and testingpattern for mould making
3D addition processes : 3D printer
digital design & technology
Fused Deposition ModellingPart is made by extruding a molten thermoplastic material (ABS, Nylon) and depositing it in ultra thin layers, one at a time, on a fixed base to build the model up.
Speed is an important benefit of this technology; many models can be produced in minutes rather than hours or days.
The completed models can be used :
as limited functionality prototypes as design verification for testing fit and/or formas patterns for investment casting.
3D addition processes : FDM/3D printer
ECT focused support centres
CAD/CAM focused support centres
Joint support centres 2008/2009
Active Support Centres
Location of 3D printers
North East Sunderland UniversityNorth West Edge Hill UniversityYorks & Humber Sheffield Hallam UniversityE Midlands Vale of Ancholme Techn & Music College, BriggW Midlands Finham Park School, CoventryEast Notley High School, BraintreeLondon John Kelly Boys Technology College, NeasdenSouth East Education Business Partnership, Ampthill, BedsSouth West Wadebridge School (until July 2009)
digital design & technology
The completed models can be used :for design verification as patterns for mould production, to make castings that canbe used as functional prototypes or production parts.
3D addition processes : LOM modelling
Laminate object manufacturing (LOM)
relatively inexpensive RPTpart is built by laminating sheets of material. parts can be finished with abrasive papers and paint.
digital design & technology
laminate object manufacturingwith the laser cutter
Step 1: create 3D CAD model using Pro/ENGINEER/ Pro/DESKTOP / ArtCAM etc'
digital design & technologylaminate object manufacturingwith the laser cutter
Step 2: export as STL file to Boxford Rapid Pro
Step 3: Use Boxford Rapid Pro to slice model - save as PDF
digital design & technology
laminate object manufacturingwith the laser cutter
Step 5: assemble LOM model
Step 4: Open PDF in Corel Draw – use laser cutter to cut slices
digital design & technology
3D addition processes : stereolithography
Stereolithographypart is built up on a platform, which rises in very small steps, through a container of liquid photopolymer
The light of a solid-state laser is used to trace the changing cross sectional profile of the CAD model onto the surface of the photopolymer, which solidifies wherever the beam strikes the surface.
more accurate and higher quality models than other RPT processes, but it is relatively expensive.
The completed models can be used :for design verification for presentation models, as light-duty prototypes as casting patterns.
digital design & technology
declarative knowledgegeneral CAD knowledge - not software specific –eg. knowing that lines can be mirrored about an axis,circles can be drawn using a ‘circle' sketching tool etc'
specific procedural knowledgeCAD knowledge that is software specific –eg. the actual steps required to mirror a line in Corel Draw
strategic CAD knowledgedeveloping meta-cognition - knowledge aboutspecific procedures and flexibility to understandmake & justify choices, to adapt where necessary, etc'
learning how to ‘do’ CAD/CAMbuilding in progression
CAPABILITY
AWARENESS
COMPETENCE
digital design & technology
the challenge for teachersestablishing the declarative / strategic knowledge needed by the learner
select teaching & learning media eg. exposition / video / audio / written text (including web pages)
develop learning strategy(ies).E-portfolios (screen dumps / annotation)reflection strategies eg.'CAD' logs collaborative learning (pupil mentors)graphic organisers
provide opportunities for the learner to further develop strategic capability through deeper engagement (eg. DMA / taking software home)
digital design & technology
additional support
cad/cam curriculum framework:http://www.cadcamcurriculum.org/
digital design & technology
http://cadcam.wikispaces.com/
additional support
digital design & technology
Thanks ….. hope it was useful …..
John LeeSheffield Hallam University:Tel: (0114) 225 2710email: [email protected]