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D.J.Hastings 1961  \nFirst published 1961  \nReprinted 1962,1963  \n150,36  \nPrinted by Offset in Great Britain byWilliam Clowes &Sons LtdLondon and Beccles  \n00999L1-19  \nPREFACE  \nThe past few years have seen a rapid growth in the number of schools offering Technical Drawing in theircurriculum.So rapid,in fact,that a large number of teachers with limited experience in the subject havetackled their work with little other than their enthusiasm.It is to offer tangible help to these teachers thatthis book has been written.  \nFew teachers of Technical Drawing will deny that the best method of presenting work to the pupils isby using prints of drawings devised by the individual teacher for the individual class.Many schools arewithout facilities for good reproduction of drawings,and bad copies have a detrimental effect.All concernedwith the presentation of this book have gone to great pains to see that the reproduction is of a high quality.Enough exercises are included to allow some selection for the needs of the class using the book.  \nThe series of exercises is graded both in difficulty and to introduce new topics progressively.The earlydrawings can be introduced by using large-scale models,and later exercises have been carefully selected sothat the object being drawn is within the school workshop experience of the pupil.In a few instances someliberty has been taken in the design of the object.This is necessary because even in simple tools,somedetails cause considerable drawing difficulty.Where it is thought necessary this should be pointed out to thepupils  \nPictorial projections are introduced before orthographic projections for the following reasons.Mostearly drawings offered for exercise are pictorial projections and it seems logical to teach these first.Theprinciples of orthographic projection cause some dificulty to young pupils,and the early errors of draughts-manship are best ironed out using exercises where the principles are more easily understood.The fact thatthe finished drawing can be seen to illustrate the thing drawn adds some incentive to the early work.  \nThe text of the book is intended to augment the teaching,but I hope there is sufficient information toenable those students who are unfortunate enough to have to work without the help of a teacher to progresssatisfactorily through the book.  \nThe later exercises in this book are more difficult than the early exercises in Exercises in EngineeringDrawing and they are intended only for the better pupils.They demand some initiative,and errors in scale,though,I sincerely hope,not in dimensioning have been deliberately included.Any other errors are un-intentional,and I shall be grateful if my attention is drawn to any that are noticed.  \nCONTENTS  \n(Items in capital letters indicate drawing exercises)  \nPagePageIntroduction1Thread conventions36-37Pictorial projections2-6Exercises in thread conventions38-40Orthographic projection7-10Square threads41Examples in orthographic projection11-14Further drawing conventions42Exercises in orthographic projection15-16Drawing a hexagonal nut43-44Joining curves17-18Exercises in threaded components44-45SHAFT SUPPORT19SHACKLE BOLT46CALIPERS AND DEPTH GAUGE20Further pictorial projections47-48Scales21Exercises in pictorial projections49Diagonal scales22OIL-CAN50Exercises in scale drawing23-24FACEPLATE51Third angle projection25COLLET CHUCK52Exercises in third angle projection26DIE HOLDER AND TAP WRENCH53Sections27-29SCRIBING BLOCK54Exercises in sectioning30-31BELL CENTRE PUNCH55Sectioning of ribs32ADJUSTABLE SUPPORT56SURFACE PLATE33DRILLING VICE57Dimensioning34-35TooL PoSTSASH CRAMP  \n5859  \nINTRODUCTION  \nMany of you will have tried to describe something you want made by drawing sketches and then explain-ing the sketches to the person who is to ","cbCaijYD6Q5lRjhI","https://ap.wps.com/l/cbCaijYD6Q5lRjhI","pdf",3237714,72,"English","# PREFACE\n# CONTENTS\n## Introduction\n## Thread conventions\n## Pictorial projections\n## Orthographic projection\n## Further drawing conventions\n## Drawing a hexagonal nut\n## Joining curves","[{\"question\":\"Who is the book written to help?\",\"answer\":\"It is written to offer tangible help to teachers with limited experience in technical drawing, and it also provides enough information for students studying without a teacher.\"},{\"question\":\"How are the exercises organized?\",\"answer\":\"The exercises are graded by difficulty and introduce new topics progressively, with early work suited to large-scale models and later work selected for objects within the school workshop experience.\"},{\"question\":\"Why are pictorial projections taught before orthographic projections?\",\"answer\":\"Pictorial projections are commonly used in early exercise drawings, and orthographic projection principles can be difficult for young pupils, so early errors are best corrected with easier-to-understand exercises.\"}]","FIRST STAGES IN ENGINEERING DRAWING - Preface and Introduction | PDF",1791862803,181]