Engineering Drawings.pptx

Engineering Drawings Range Time Chapter 02 & Page 15 Notes & Handouts Questions Review Objectives Set At the end of this lesson, you will be able to: Recognise basic engineering drawing conventions and interpret information contained within engineering drawings. Purpose Engineering d...

Engineering Drawings Range Time Chapter 02 & Page 15 Notes & Handouts Questions Review Objectives Set At the end of this lesson, you will be able to: Recognise basic engineering drawing conventions and interpret information contained within engineering drawings. Purpose Engineering drawings are an ‘unambiguous’ means of communication between engineers The drawing will convey to the engineer exactly what they must do in order to produce, modify, repair or assemble the component. International Standardization Air Transport Association (ATA) of America International Organisation for Standardisation (ISO) National Aircraft Standards (NAS) Military Standard (MIL). Standards Used In MHS All Engineering Drawings used in MHS conforms to:- British Standards Institute (BSI) derived from the International Organisation for Standardisation (ISO) In particular BS 8888 2020 which is revised every 2 years. Isometric Projection Each view is what is seen by looking at the FAR side of an adjacent view. Each view is what is seen by looking at the NEAR side of an adjacent view. Projection Symbols Angled Surfaces Shows ‘TRUE’ shape of inclined plane Questions? Hatching of Adjacent Parts Cutting Plane Indicated A A-A A Parallel Cutting Planes A A A-A Successive Sections A B C D D A C A-A B-B C-C D-D B Revolved Sections Sectioned Assembly Drawing Half Section Local Section Thin Section Adjacent Part Types of Lines Real items Solid line Hidden items Dash line Imaginary items Chain A Cutting Plane A Special Requirement Adjacent Parts Special Requirement Line Questions? Abbreviations and Symbols Abbreviations and Symbols Abbreviations and Symbols Removal of Removal of Any material material manufacturing required not process Ground permitted permitted Ru 0.05 0.1 C Material Material shall be shall not be Machinin removed removed g allowanc Welds and Symbols Questions? Dimensioning Between Two Points Dimensioning In-Line Limits and Tolerances 80.3 79.7 40.3 39.7 40 80 MATERIAL TOLERANCES DRN DM AL ALLOY 0.3 DATE 180609 ALL DIMENSIONS IN UNLESS MM FINISH APPD GJ CLEAN & OTHERWISE DEGREASE STATED DATE 180609 Limits and Tolerances Progressive Dimensioning – Common Datum Chain Dimensioning Tolerance Accumulates Complete Circles Dimensioning Radii Angular Dimensions Holes-Angular Position Dimensioning Chamfers Dimensions Functional, Non-Functional and Auxiliary Questions? Title Block Scale 1:1 Full size (Drawing and Component same size) 1:2 Half size (Drawing smaller than Component) 2:1 Twice full size (Drawing larger than Component) Note:- ONLY the indicated dimensions (those shown on the drawing) are to be used for production purposes. Single Part Drawings Assembly Drawing Servicing Drawing Servicing Drawing Questions? Objectives Met You are now able to: Recognise basic engineering drawing conventions and interpret information contained within engineering drawings.