DSGN06155 2019 CAD/CAM 202
The overall aim of this module is to enhance students’ skills and knowledge of mechanical design and to provide them with practical experience of CNC machining. Students will create models and working drawings of mechanical parts and products including jigs, fixtures, grippers and other workholding devices. Students will also gain hands-on practial experience of CNC machine tool setup and operation.
On completion of this module the learner will/should be able to;
Create solid models of complex mechanical parts.
Build 3D assembly models of mechanical mechanisms incorporating complex parts.
Design jigs, fixtures, work holding devices and grippers that are soundly based on good design practice.
Efficiently produce sets of working drawings for mechanical products that include the insertion of linear tolerances, geometrical tolerances and surface texture indications.
Read and interpret complex engineering drawings and produce drawings that conform to international standards.
Download CNC code files using a Direct Numerical Control (DNC) system to CNC milling machines.
Set up and machine parts on CNC milling machines.
Teaching and Learning Strategies
This module will involve the use of a 3D mechanical modelling CAD system to generate solid models of parts and assemblies, and the drawings required to fully describe them. It will also involve the use of CNC/CAM package to genrate CNC code and CNC machining using CNC milling machines.
Students will be timetabled for three hours per week in a computer aided design laboratory.
Students will also be timetabled for two hours per week in a CNC laboratory/workshop.
In addition to the normal lectures and practical classes, Designers, Programmers and/or Engineering Practitioners working in industry will be invited as guest lecturers and site visits to companies will be arranged, where possible.
Module Assessment Strategies
Continuous assessment will involve the assessment of all assignments undertaken in class, design project activity completed independently and an end of term in-house assessment test.
Students who fail the module but satisfy the attendance requirements will be required to resubmit all continuous assessment assignments and/or undertake an repeat end of semester assignment test.
Part Modelling: Approach to ensure efficient creation of fully defined sketches, approach to ensure efficient creation of feature and parts, feature modification and analysis, part properties, parent/child relations.
Assembly Modelling: Inserting/adding components to an assembly, standard, advanced and mechanical assembly relations and mates, top-down assembly, in-context parts, moving components, external and reference files, assembly configurations.
Design: Jig and fixture types and functions, planes of movement, support, location and clamping principles, drill bushes, use of standard parts, template jigs, angle plate jigs, channel and box jigs, machining fixtures, welding jigs, power work holding, modular tooling, gauges, gripper/end-effector design, parallel, three-jaw, angle and radial grippers.
Drafting: Approach to ensure efficient creation of engineering drawings of complex mechanical products that conform to recognised standards and conventions.
Drawing Standards: Reading and interpreting engineering drawings of complex mechanical products and mechanisms, application of ISO drawing standards, production and presentation of engineering drawings to professional standards, inclusion of annotations, dimensions and linear tolerances, geometrical tolerances and surface texture indications.
CNC Machining: Overview of CAD/CAM packages, post processors, creation of tool paths for roughing and finish machining, tool selection, feeds and speeds, safe start-up and operation of CNC machine tool, machining of parts, introduction to manual programming.
Coursework & Assessment Breakdown
|Title||Type||Form||Percent||Week||Learning Outcomes Assessed|
|1||Continuous Assessment of Assignments (CAD)||Continuous Assessment||Practical Evaluation||30 %||OnGoing||1,2,3,4,5|
|2||End of Semester Assessment Test||Continuous Assessment||Closed Book Exam||30 %||End of Semester||1,2,3,4,5|
|3||Continuous Assessment of Assignments (CNC Machining)||Continuous Assessment||Practical Evaluation||40 %||OnGoing||6,7|
Full Time Mode Workload
|Design Projectwork||Computer Laboratory||Computer Aided Design||3||Weekly||3.00|
|Practical||Engineering Laboratory||CNC Machining||2||Weekly||2.00|
|Independent Learning||Not Specified||Study and practice||3||Weekly||3.00|
Required & Recommended Book List
2009-02-02 The Mechanical Design Process McGraw-Hill Science/Engineering/Math
ISBN 0072975741 ISBN-13 9780072975741
The fourth edition of The Mechanical Design Process combines a practical overview of the design process with case material and real-life engineering insights. Ullman's work as an innovative designer comes through consistently, and has made this book a favorite with readers. This book conveys the "flavor" of design, addressing both traditional engineering topics as well as real-world issues like creative thinking, synthesis of ideas, visualization, teamwork, sense of customer needs and product success factors, and the financial aspects of design alternatives, in a practical and motivating manner. New in this edition are examples from industry and over twenty online templates that help students prepare complete and consistent assignments while learnign the material. This text is appropriate primarily for the Senior Design course taken by mechanical engineering students, though it can also be used in design courses offered earlier in the curriculum. Working engineers also find it to be a readable, practical overview of the modern design process.
2012-05-15 Introduction to Computer Numerical Control (CNC)
ISBN 0132176033 ISBN-13 9780132176033
Aimed at undergraduate courses, this text uses a practical step-by-step approach to develop the most fundamental concepts in CNC (computer numerical control) technology. It focuses on word address (G and M code) programming for the industry standard Fanuc controllers.
1989 Handbook of Jig and Fixture Design, 2nd Edition Society of Manufacturing Engineers
ISBN 9780872633650 ISBN-13 0872633659
This book explains both basic principles and advanced designs and applications for today's flexible systems and controlled machines. Chapters include: Predesign Analysis and Fixture Design Procedures Tooling for Numerical Control Geometric Dimensioning and Tolerancing Tooling for Drilling and Reaming Grinding Fixtures Tooling for Flexible Manufacturing Systems and more!
Suppliers Handbooks where available
In class material supplied