CAD Organiser (MEM Units)
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Updated TL: Feb, 2010


MEM30001A UNIT INFORMATION (CIDO)

Elements of Competency and Performance Criteria

(For students working from MEM30001A>2A>3A>4a, unnecessary duplication is shown in coloured italics
These do not have to be repeated in subsequent units since they are wholly contained in the pre-requisite)

MEM30001A Basic CADMEM30002A Eng GraphicsMEM30003A Detail DrwgsMEM30004A 3D CAD
PREREQUISITES:
MEM16006A Org and com info
MEM16008A Interact with computing
PREREQUISITES:
MEM16006A Org and com info
MEM16008A Interact with computing
PREREQUISITES:
MEM16006A Org and com info
MEM16008A Interact with computing
MEM30001A Basic CAD
MEM30002A Eng Graphics
PREREQUISITES:

MEM16008A Interact with computing
MEM30001A Basic CAD
Aim: Draw any 2D shape in CAD Aim: Set up ortho drawings, isometric, assembly, proj viewsAim: Do detail drawings with  dimensions, symbols, tolerances etcAim: Do 3D models & assemblies

1. Prepare the CAD environment

1.1 All relevant manuals, instructions and operating procedures for the CAD software are obtained in accordance with workplace procedures.

1.2 The CAD package is booted up in accordance with workplace procedures.

1.3 Screen display areas and basic parameters are set in accordance with instructions.

1. Identify drawing requirements

1.1 All relevant job requirements and design specifications are obtained in accordance with workplace procedures.

1.2 Drawing requirements and specifications are identified and interpreted.

1. Determine drawing requirements

1.1 Drawing requirements are checked and interpreted from work order or similar.

1.2 Required information is sourced from workshop manuals, customer specifications, product suppliers, designers or similar.

1.3 Scope of drawing including layout, additional required information and resources is planned.

1. Set up a three dimensional environment

1.1 Set up a three dimensional environment on the screen to allow multiple viewing.

2. Produce a basic drawing

2.1 Basic CAD drawings are created and guidance is sought as required.

2.2 Drawings are prepared in accordance with AS 1100 or equivalent or in accordance with standard operating procedures.

2.3 As required, CAD drawings are reviewed with supervisor and/or other designated staff in accordance with company procedures.

2. Prepare assembly, layout and general drawings in accordance with instructions

2.1 Drawings are prepared in plane orthogonal, isometric projection or equivalent including sections to Australian Standard 1100, as required.

2.2 Problems are resolved in consultation with a supervisor.

2. Produce detail drawings in third angle projection, including auxiliary views, sections and assemblies

2.1 Drawing details including assembly and components are completed as per AS 1100 or similar.

2.2 Dimensions of various components are determined and inserted where required.

2.3 Appropriate symbols for limits and fits, surface texture and geometric tolerances are included.

2.4 Simple components or layouts are drawn in third angle projection.

2.5 An auxiliary view is drawn of a component, given two views.

2.6 Correct convention for parts is shown.

2. Create three dimensional views

2.1 Three dimensional views are created on the screen by manipulation of drawing planes and insertion of three dimensional geometric shapes.

2.2 Any plane of the three dimensional view is drawn on.

2.3 Editing functions are used to modify three dimensional geometric shapes in creating three dimensional views.

3. Modify existing CAD drawings

3.1 Existing CAD drawings are located and modified by adding, deleting or changing drawing elements within that drawing.

3. Draw sections through simple engineering components as required for clarity

3.1 Sections are drawn through an engineering component incorporating correct use of cutting plane(s) symbols and conventions.

3. Issue and/or file drawing

3.1 Drawing is issued and/or filed according to workplace procedures.

3. Display three dimensional views

3.1 Wire line, surface and solid face displays are produced in isometric, perspective and orthographic projections.

4. Produce output

4.1 Drawing files are saved in the appropriate format in accordance with standard operating procedures.

4.2 Drawing files are printed out using plotter or equivalent devices.

4. Select physical dimensions from manufacturer handbooks

4.1 Where required, components and/or materials are selected from supplier/manufacturer catalogues using predetermined design specifications.

-4. Extract mass and area properties of a 3D model

4.1 The mass and surface area of a given solid model made from a nominated material is extracted.

5. Perform exit and shut-down  procedures

5.1 Programs and computer are shut down in accordance with workplace procedures.

5. Prepare engineering parts list

An engineering parts list is produced in accordance with workplace procedures.

-5. Apply basic rendering techniques to a 3D model

5.1 A solid model is rendered to a specified set of criteria.

-
6. Issue or file completed drawing/parts list
6.1 Approved drawings and/or parts lists are stored, catalogued and issued in accordance with standard operating procedures
-6. Save completed drawing file in various formats

6.1 File is saved in an appropriate format to enable retrieval and use in a CAD system.

6.2 File is saved in other formats to enable retrieval in other software applications.



Knowledge and Skills 
MEM30001A Basic CADMEM30002A Eng GraphicsMEM30003A Detail DrwgsMEM30004A 3D CAD
SKILLS
  •  reading and interpreting engineering specifications
  • organising information
  • using computers and peripherals
  • using CAD program
  • preparing simple drawings in plane orthogonal, isometric projection or equivalent
SKILLS
  • correctly using and maintaining equipment including CAD
  • manual drafting, filing and printing
  • reading and interpreting specifications
  • communicating
  • visualising components
  • preparing a drawing in plane orthogonal, isometric projection or equivalent
SKILLS
  • drawing
  • documenting
  • applying principles of geometric tolerances
  • identifying functional surfaces and datums on assembly drawings
  • producing detail drawings of machine components and dimension from datums
SKILLS
  • reading and interpreting engineering specifications
  •  organising information
  •  using computer and peripherals
  •  using CAD program
  •  saving 3D models in various file formats
  • preparing drawings in plane orthogonal, isometric projection or equivalent
KNOWLEDGE
  • CAD program capabilities and processes.
KNOWLEDGE
  • drafting media including cartridge paper, tracing paper, drafting film, plan printing paper
  • layout conventions
  • effective use of blank space, location of notes and symbols
KNOWLEDGE
  • projection
  • auxiliary views, special attention
  • etail drawings
  • fabricated components
  • machined components
  • cast and forged components
  • structural details
  • threads fasteners – terminology
  • drawing of threads
  • methods
  • projection lines
  • arrangement
  • general tolerancing
  • limits and fits
  • shaft and hole basis
  • extremes of fit
  • surface texture
  • selection of standard roughness values for given processes
  • application of surface finish symbols to drawings
  • selection and application of equivalent surface roughness numbers
  •  geometric tolerancing
  • simple geometry tolerancing (no datum references, flatness, roundness etc.)
  • geometry tolerance with datum reference (e.g. parallel squareness)
KNOWLEDGE
  • region modelling techniques.
  • solid modelling techniques
  • development of sectioned models
  • use of cutting plane
  • use of cross hatching
  • use of pre-drawn library files and primitives to produce a 3D model
  • use of third level software to produce 3D models
  • how to extract mass and area properties
  • how to extract area properties from region models
  • application of basic rendering techniques to a 3D model

Delivery Plan

MEM30001A Basic CADMEM30002A Eng GraphicsMEM30003A Detail DrwgsMEM30004A 3D CAD
1. The CAD System
  • classification of CAD software eg: 2D, 3D, surface/solid etc.
  • advantages
  • user interface
1. Overview
  • manual drafting equipment
  •  CAD equipmentdrawing sheets  
1. Drawing requirements
  •  work order or similar
  •  workshop manuals, customer specifications, product suppliers, designers or similar
  •  scope of drawing:  layout, additional information, resources, drawing standards
1. Three dimensional environment
  • multiple viewing
2. Basic Operations
  • start-up and shut down procedures
  • file management
  • viewing functions
  • using on-line help

2. Line types 

  •  line thickness and density
  •  dimension lines
  •  leader Lines
  •  arrowheads
  •  lettering
  •  symbols 

2. Detail drawings

  •  assembly/components
  •  elements
  •  dimensions
  •  symbols, limits and fits, surface texture, geometric tolerances
  •  third angle projection
  •  auxiliary views
  •  conventions
2. Creation of views
  • drawing planes
  • geometric shapes 
  • use of any plane
  • editing functions 
3. Data Entry Methods
  • rectangular vs polar.
  • absolute vs relative
  • drawing aids eg: grid etc
  • positional and geometric constraint modifiers
3. Shape representation
  • orthographic
  •   selection of views: single, partial, auxiliary, removed
  •  three-dimensional (3D)
  •  axonometric projection (isometric preferred)
  •  oblique (general preferred)  
3. Issue and/or file drawing
  • workplace procedures
  •  file/retrieval 
3. Display of views
  • wire line 
  • surface and solid face displays: isometric, orthographic 
4. Modelling
  • drawing: line, point, circle, polygon, ellipse, spline, dimension, hatch  
  • editing:  delete, fillet, chamfer, trim/extend, break
  • transfer:  move, copy, rotate, mirror, polar and rectangular duplication
4. Aesthetic Use of Visual Space on Drawing
  • layout conventions, use of blank space
  •  positioning of drawing elements
  •  location of notes and symbols
  •  sectioning:  cutting planes,  full,  half,  part, offset, oblique,  revolved,  removed,  interposed,  fasteners,  shafts,  webs
-4. Modelling
  •  terminology: region /  solids /  wire frame 
  • region modelling techniques: creating a primitive /  editing regions 
  • solid modelling techniques: creating solid primitives /  editing solid primitives /  converting region models to solid models 
  • composite models:  create composite regions /  create composite solids 
  • sectioned models:  cutting plane /  cross hatching 
  • pre-drawn library files 
5. Techniques
  • drawing: guidelines for efficient use (using CAD tools rather than line-by-line drawing)
  • editing:  modifying an existing single view drawing of an object.
  • pre-defined templates
  • text: placing preset text
  • dimensions: placing preset dimensions
  • basic 2D drawing: completing a single view exercise of a flat object
  • plotting: producing a hard copy (using pre-defined settings)
5.Overview of Graphical Techniques
  • assembly drawings
  •  explosion drawings
  •  schematics/line drawings
  •  graphs
  •  pictorials 
-5. Mass and area properties
  • nominated material 
  • extract area properties
6. Rendering techniques
  • specified set of criteria 
  • lights, views, scenes etc 
  • materials and surface finish options
6. Engineering parts list
  • preparation
  •  symbols - material types
-6. Rendering techniques
  • specified set of criteria 
  • lights, views, scenes etc 
  • materials and surface finish options
7. Completed drawing
  • hard copies 
  • retrieval and use 
  • saving in other formats
7. Completed drawing/parts list 
  • store
  •  catalogue
  •  issue
-7. Completed drawing
  • hard copies 
  • retrieval and use 
  • saving in other formats



 Glossary 

Basic parameters Include layer or level, line type, line width, colour and text format etc.
Basic CAD drawingsInclude the following characteristics: lines, arcs, circles, polygons, ellipses, hatching or filling of areas, text, dimensions and tangents
Equivalent devicesMay include inkjet printers or the like

Specifications May be obtained form design information, customer, ideas, concepts/expectations/requirements, sketches, preliminary layouts
Drawings Include plans, diagrams, charts
Consultation May include reference to appropriate personnel including technical supervisors, manufacturers, suppliers, contractors, customers
Engineering parts list May include part name, description of part, material specification or part number, quantities and other details as required
Issued drawings Hard copy, photographic, slide or transparency form including presentation as a single drawing and/or with other drawings, support documentation as a package

Geometric tolerances Simple geometry tolerancing (no datum references, flatness, roundness etc.)Geometry tolerance with datum reference (e.g. parallel squareness)
Simple components or layouts May include fabricated components, machined components, cast and forged components, structural details, electrical electronic components, fluid power components
Parts Mechanical components such as fasteners, bearings, seals, gears, keys, splines etc. Electrical components such as cables, connectors, terminations etc. Fluid power components such as actuators, valves, hoses, connectors, relays etc.

Multiple viewing Includes top views, front and side views, and a general three dimensional view
Three dimensional geometric shapes May include arcs and lines, spheres, cones, cylinders and boxes