Assignment 1 - olsjdt



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|LEARNER NAME |ASSESSOR NAME |

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| |N. Hodgson |

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|DATE ISSUED |HAND IN DATE |SUBMITTED ON |

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|Criteria |Evidence |Feedback |

|P1 - Describe the advantages, compared to other methods, of producing|Completion of task 1| |

|drawings electronically using a CAD package | | |

|P2 - Describe the software and hardware required to produce CAD |Completion of task 2| |

|drawings | | |

|M1 - Explain the relationship between CAD and other software/hardware |Completion of task 3| |

|used in manufacturing | | |

|D1 - Justify the use of CAD in a manufacturing company |Completion of task 4| |

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|This brief has been verified as fit for purpose |

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|Internal Verifier |ANTHONY SPICER |

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|Signature |A J Spicer |Date |17/08/2012 |

Student declaration

I declare that all the work submitted for this assignment is my own work or, in the case of group work, the work of myself and the other members of the group in which I worked, and that no part of it has been copied from any source.

I understand that if any part of the work submitted for this assignment is found to be plagiarised, none of the work submitted will be allowed to count towards the assessment of the assignment

Signed …………………………………… Date ……………………………………

|Assessor's comments |

|Qualification |Edexcel Lev 3 National Diploma in Engineering |Assessor name |N. Hodgson |

|Unit number and title |Unit 17 – Computer aided drafting in Engineering|Learner name | |

| |(A/600/0267) | | |

|Assignment title |ASSIGNMENT ONE – CAD REPORT |

|Grading criteria |Achieved? |

|P1 - Describe the advantages, compared to other methods, of producing drawings electronically using a CAD package | |

|P2 - Describe the software and hardware required to produce CAD drawings | |

|M1 - Explain the relationship between CAD and other software/hardware used in manufacturing | |

|D1 - Justify the use of CAD in a manufacturing company | |

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|Learner feedback |

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|Assessor feedback |

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|Action plan |

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|Assessor signature | |Date | |

|Learner signature | |Date | |

ASSIGNMENT OBJECTIVES

The aim of this module is to provide the learner with an introduction to CAD and to enable them to produce engineering drawings to given industry standards.

The purpose of this assignment is to provide a framework in which the learner will:

• Be able to produce and interpret CAD drawings

ASSIGNMENT INTRODUCTION

Computer Aided Drawing (CAD) is now used extensively throughout the engineering industry as a means of communicating drawing data to required standards. Two- and three-dimensional representations of components can be drawn and modified allowing the sharing of data from designer to customer. CAD data can be shared with CNC machines and Computer Aided Manufacturing (CAM) software, which may then assist in improving productivity, flexibility and quality of the final product.

During this assignment you are going to use computer-aided design to produce to number of 2D CAD detail drawings that use a wide range of drawing commands and that meet British Standards for Engineering drawings. These drawings will make up the majority of the evidence for this assignment so it is important that you print these and keep them in your folder of evidence.

TASK 1 – ADVANTAGES OF CAD

P1 - Describe the advantages, compared to other methods, of producing drawings electronically using a CAD package

a. Produce a report in which you discuss the advantages of CAD over conventional drawing techniques. The following sub-headings are for your guidance and may be used in order to structure your report.

Quality of 3D representation

Explore the meaning of accuracy of part design using CAD. Include the Quality of surfaces, triangulation of 3D models, accuracy of lines/ curves/ surfaces in models.)

Accuracy of 2D Part / Assembly Drawings

Discuss the accuracy of the 2D drawings created within CAD. This is the stage that would most likely lead into manufacture. Take into consideration the model accuracy/ maximum chord height/ tolerance of ‘functional surfaces’, quality of drawings.

The time taken from ‘Concept Idea to Manufacture’

Consider the ‘functionality’ of the software to be able to produce a production component from a concept idea.

How long does it typically take to draw a 3D model/ build an assembly/ create a 2D drawing? What is required to prepare a model for manufacture? A stage-by-stage list of preferred methodology may be suitable to support your answer.

Discuss parametric modelling and the way a component is drawn in CAD to minimise the effort required to modify geometry if necessary.

Identify ways that models can be created from standard part libraries, and sub-assemblies that may be common to a range of parts.

Discuss the opportunity some software has to reduce lead times by allowing collaborative modelling from various Engineering sources (designer / manufacturing Engineer / Stress Analysis / CNC Programming / Inspection)

Cost of software.

What is the cost of a licence (for industry/ commercial gain). Compare the cost against the functionality across a range of CAD applications. Identify any additional costs for increased functionality (kinematics / FEA analysis, Electrical wiring, etc)

Discuss the purpose of software licences and why they are prevalent.

Electronic transfer of information

Identify how the 3D / 2D models can be used with other software.

For example what are the necessary stages involved in exporting the models for use with CAD/CAM, rendering software, animation software, finite element analysis (FEA).

Typical examples of ‘exported’ models include STL, IGES, DXF, DWG, STEP, etc.

What is the resultant file / what does it contain – for example a DXF file is 2D with only lines and curved expressed as vectors. An STL is a faceted (triangulated) model in a binary format with a degree of accuracy controlled by the ‘chord height)

Discuss the advantages and limitations of the models produced during the data exchange process.

Other Methods of Drafting

Discuss the historic progression of designing parts and components. A good example of this may be the ‘draughtsman’ and how traditionally the skills were in the production of hand drawn orthographic views of components.

What are the advantages of the ‘draughtsman’ approach? What similarities are still apparent in the CAD software used now? What skills have been ‘lost’ or are ‘invaluable’ when designing an engineered component.

Discuss the impact the development of CAD has had on the role / necessity of Engineers in a typical company. Discuss the large and small engineering companies and how the engineers may be affected in the future.

What skills are now expected of an engineer above and beyond an understanding of typical part design / manufacture?

TASK 2 – CAD SOFTWARE & HARDWARE

P2 - Describe the software and hardware required to produce CAD drawings

a. Software

Discuss the operating systems that the software is installed on (Windows / UNIX)

Identify the range of CAD software packages used by the ‘sectors of Engineering’. – Automotive / Aerospace / Space / Nautical, etc. (Pro Desktop, Pro Engineer, Catia, Pro/ENGINEER, Solidworks, AutoCAD, etc)

Compare at least two different CAD software applications and the functions / benefits / opportunities. Give reasons why small / medium / large companies may chose one particular system over another.

Identify the minimum system requirements that typical 3D CAD software requires to run adequately. E.g. hard disk space, memory required, processor, video card.

b. Hardware

Identify the main types of hardware required and used during normal operation.

(Keyboard; mouse; other input devices e.g. light pen, digitiser, joystick, thumbwheel; monitor; printer; other output devices e.g. plotter, rapid prototyping; storage e.g. floppy disk, hard disk, memory stick, CD, network)

Discuss these benefits of additional devices and the contribution to the design cycle.

TASK 3 – RELATIONSHIP BETWEEN CAD & OTHER SOFTWARE

M1 - Explain the relationship between CAD and other software/hardware used in manufacturing

Following your recent visit to the CAD design department at Leyland Trucks you are to discuss how the linking of CAD to other software/hardware used within the company (i.e. Oracle software, used in production management) has a key impact upon that organisation in terms of manufacturing (e.g. manufacturing efficiency, improving production, reducing costs, reducing waste and reducing lead times).

Your report should also make reference to how Leyland trucks use concurrent Engineering techniques in order to ensure the most efficient way of manufacturing their products and how CAD is used within this.

Explore – Reducing lead times; reducing waste; reducing costs; manufacturing efficiency

TASK 4 – JUSTIFY THE USE OF CAD WITHIN A MANUFACTURING COMPANY

D1 - Justify the use of CAD in a manufacturing company

During your visit to Leyland Trucks that you will have seen first hand how the company have made a significant investment in CAD.

For this task you should produce a report that justifies this investment in terms of its benefits to this company as a whole giving particular consideration to the Design department, Research and Development (R&D) departments and to the manufacturing process as a whole. Consider the following points…..

What is the overview of the business and consider its historical approach to the design and manufacture of its products (how were products designed and manufactured before CAD was implemented).

Identify the key reasons as to why Leyland trucks have invested so heavily in CAD. Report upon the extent to which the CAD application is used within the business. Are there multiple CAD applications used? How is data transferred between the areas of the business?

Consider how Leyland Trucks now uses CAD applications to control the manufacture of its products.

Explain the impact (advantages & disadvantages) that CAD has had within all key areas the business and identify any enhancements that you could see the company introducing over the next few years (investment in future products)

Research opportunities and Further Reading





(Handbook of Computer Aided Geometric Design )



(Changes in Engineering Profession Article)



(articles on CAD)





(what is in an STL file)

CAD Software



Pro Engineer

Solidworks, CATIA

Reseller of software

Autodesk Inventor

Solid Edge

Comparison of CAD Software



Videos to Watch







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UNIT 17 – Computer Aided Drafting in Engineering (A/600/0267)

ASSIGNMENT ONE – CAD REPORT

Health and safety legislation, regulations and safe working practices in fabrication

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