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Producing drawings for patterns and models using 3D computer aided techniques

URN: SEMPAT322
Business Sectors (Suites): Engineering Woodworking, Pattern and Model Making Suite 3
Developed by: Enginuity
Approved on: 2018

Overview

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This standard identifies the competencies you need to set up and operate a computer aided design system to produce three-dimensional simple and complex drawings to aid the production of patterns, cores, coreboxes or models, in accordance with approved procedures. This will require you to select the appropriate equipment and software to use, based on the type and complexity of the patterns or models being produced. You will be expected to set up co-ordinate systems in 3D space, and to set up the screen into split views to show true 3D views (isometric) and plan views. You will then be expected to produce both surface and solid models and show that you understand their differences and applications. You will use boundary modelling techniques as well as graphic primitives to produce your models, and will apply Boolean operators to construct the solid models.

Your responsibilities will require you to comply with organisational policy and procedures for working in the drawing office or Computer Aided Design (CAD) suite. You will be required to report any problems with the CAD hardware, software or drawing procedures that you cannot personally resolve, or are outside your permitted authority, to the relevant people. You will be expected to work to verbal or written instructions and draught specifications, with a minimum of supervision, taking personal responsibility for your own actions and for the quality and accuracy of the work that you carry out.

Your underpinning knowledge will provide a good understanding of your work, and will provide an informed approach to applying computer aided drawing procedures. You will understand the 3D CAD system and software used, and its application, and will know about the various tools and techniques used to produce the drawings, in adequate depth to provide a sound basis for carrying out the activities to the required specification.

You will understand the safety precautions required when working with the CAD system. You will be required to demonstrate safe working practices throughout, and will understand the responsibility you owe to yourself and others in the workplace.

Performance criteria

You must be able to:

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  1. prepare the CAD system for operation

  2. produce drawings that are sufficiently and clearly detailed

  3. produce drawings in the required formats
  4. use codes and other references that follow the required conventions
  5. make sure that drawings are checked and approved within agreed timescales by authorised people
  6. ensure drawings are properly saved and stored securely
  7. ensure that changes are completed as required by organisational procedures

Knowledge and Understanding

You need to know and understand:

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  1. the specific safety precautions to be taken when working with Computer Aided Drawing (CAD) systems - to include such items as safety guidance relating to the use of visual display unit (VDU) equipment and work station environment (such as lighting, seating, positioning of equipment) repetitive strain injury (RSI), the dangers of trailing leads and cables; how to spot faulty or dangerous electrical leads, plugs and connections
  2. good housekeeping arrangements (such as cleaning down work surfaces; putting media, manuals and unwanted items of equipment into safe storage; leaving the work area in a safe and tidy condition)
  3. the set-up and operation of the 3D CAD system and the peripheral devices that are used (such as mouse, light pens, digitisers and tablets, printers or plotters, scanners)
  4. the correct startup and shutdown procedures to be used for the CAD system
  5. how to access the specific CAD software to be used; the use of access codes for personal files; how to deal with system problems (such as error messages received, peripherals which do not respond as expected, obvious faults with the equipment or connecting leads)
  6. the importance of protecting the computer system from viruses, and the implications if the correct procedure is not followed
  7. the use of software manuals and related documents to aid efficient operation of the CAD system
  8. types of drawings that may be produced by the software (such as first and third angle drawings, sectional drawings, assembly drawings, isometric or oblique projections)
  9. how to set up the viewing screen to show multiple views of the pattern or model, to help with drawing creation (to include isometric front and side elevations)
  10. the national, international and organisational standards and conventions that are used for the drawings
  11. how to set up the drawing template taking account of the scale of the drawing and the paper size that will be required; how to choose and set up colour, line type, dimension and text styles to suit the pattern or model to be drawn
  12. how to construct drawings, and the application and use of drawing tools for surface or solid modelling; the use of standard library component parts; how to create hatching and shading on drawings
  13. how to modify the patterns or models using surface modifying tools or Boolean operators
  14. the procedures and methods of importing files, and for editing drawings and text
  15. the need to ensure that completed drawings are approved, correctly labelled, and stored on a suitable storage medium
  16. how to determine the document size and check that there is sufficient space to save the drawing in your chosen destination
  17. the need to create backup copies of the drawings and to file them in a separate and safe location away from electromagnetic sources
  18. how to create hard copies of drawings using printers or plotters, and methods of filing and storing the hard copies for use in production
  19. how to instigate a drawing change, get it authorised and record the change, date and its approval authorisation
  20. the extent of your own responsibility, and whom you should report to if you have problems that you cannot resolve when producing the drawings of the patterns or model

Scope/range

Scope Performance

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1. Prepare the CAD system for operation by carrying out all of the following:
1.1. check that all the equipment is correctly connected and in a safe, tested and usable working condition (cables undamaged, correctly connected, safely routed)
1.2. power up the equipment and activate the CAD software
1.3. set up the drawing environment to show multi views of the pattern or model to help with drawing creation (this will involve isometric, front and side elevations)
1.4. control the drawing environment to produce the correct colour and line type
1.5. create a standard drawing template to BS, European or company standards, which includes all necessary detail (such as title, drawing number, scale, material, date)

2. Use either of the following drawing/design tools, as appropriate to the application:
2.1. surface modelling
2.2. solid modelling

3. Produce and modify 3D drawings using two of the following tools and techniques:
3.1. graphic primitives
3.2. surface modifying tools
3.3. boundary techniques
3.4. Boolean operators
 
4. Produce 3D drawings to aid the production of three of the following:
4.1 flat-backed patterns with cores
4.2 core boxes with special features (loose pieces, collapsible)
4.3 irregular joint patterns
4.4 plated patterns (copes)
4.5 scale models
4.6 split patterns without cores
4.7 solid turnout coreboxes
4.8 sectional models
4.9 split patterns with cores
4.10 split coreboxes
4.11 vacuum forming tools
4.12 plated patterns (drags)
4.13 full-size models
4.14 stripping plates

5.: Save and store drawings in appropriate locations, to include all of the following
5.1 ensure your drawing has been checked and approved before storing
5.2 check that the drawing is correctly titled and referenced
5.3 save the drawing to an appropriate storage medium and create a separate backup copy
5.4 produce a hard copy print out of the drawing, for file purposes (where required)
5.4 register and store the drawings in the appropriate company information system
5.4 where appropriate, record and store any changes to the drawings, and reasons for changes in the appropriate company information system

6. Produce drawings which comply with all the following quality and accuracy standards:
6.1 drawing conventions used comply with BS, European and company standards and procedures
6.2 drawings accurately represent the required patterns, coreboxes or models
6.3 drawings are of an appropriate scale, clearly defined, with text and dimensions legible
6.4 drawings are fully dimensioned and toleranced and avoid redundant dimensions
redundant dimensions

Scope Knowledge

Values

Behaviours

You will be able to apply the appropriate behaviours required in the workplace to meet the job profile and overall company objectives, such as:

  • strong work ethic
  • positive attitude
  • team player
  • dependability
  • responsibility
  • honesty
  • integrity
  • motivation
  • commitment

Skills

Glossary

Links To Other NOS

External Links

Version Number

2

Indicative Review Date

2021

Validity

Current

Status

Original

Originating Organisation

Semta

Original URN

SEMPAT22

Relevant Occupations

Engineering, Engineering and Manufacturing Technologies, Functional Managers, Managers and Senior Officials

SOC Code

5221

Keywords

engineering; woodworking; pattern making; model making; drawings; CAD pattern drawings; CAD corebox drawings; CAD model drawings; surface modelling; solid modelling