CAD/CAM in schools initiative in schools initiative . ... Pro/DESKTOP 3D solid modelling Sept 1999...

digital design & technology

John LeeJune 2009

CAD/CAM in schools initiative 10 years on ...... where are we now?


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


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)


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


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


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


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


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


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)


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)


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


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’


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


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)


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.


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



Step 5: assemble LOM model

Step 4: Open PDF in Corel Draw – use laser cutter to cut slices


Buxton Community SchoolTeacher: Paul Cooper


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 printing


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


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)


additional support

cad/cam curriculum framework:http://www.cadcamcurriculum.org/

http://www.cadcamcurriculum.org/


http://cadcam.wikispaces.com/

additional support

http://cadcam.wikispaces.com/


Thanks ….. hope it was useful …..

John LeeSheffield Hallam University:Tel: (0114) 225 2710email: [email protected]

mailto:[email protected]

CAD/CAM in schools initiative in schools initiative . ... Pro/DESKTOP 3D solid modelling Sept 1999...

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