Mechanical Drawing

D. Jones Franklin

Description

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. AS mechanical drawing has been a very popular subject among students in schools and shops, numerous text-books have been published on mechanical drafting practice. This book is added to the list because the publishers believe that there has been need for a treatise dealing more thoroughly with methods which are actually employed in well-managed drafting-rooms. Many books on mechanical drawing have covered such subjects as geometrical drawing problems, ortho graphic projection, the development of intersecting surfaces, etc., but the application of these principles and the real object of mechanical drawing as related to machine and tool manu facture has been dealt with vaguely, in many instances. The student has been taught certain details, but he has not been given a clear conception of the work of draftsmen and de signers in _the drafting-rooms of machine-building plants. This book presents the subject in a way that will enable the student to understand what the term mechanical drawing really means in its broadest sense, the essential features of modern drafting practice, and the difference between the mere representation of a design by a suitable drawing and the more valuable work of originating and developing the design itself.

Sujets

• Sciences et techniques

Informations

• Publié par: Forgotten Books
• Date de parution: 27 novembre 2019
• Nombre de lectures: 0
• EAN13: 9780243632725
• Langue: English
• Poids de l'ouvrage: 15 Mo

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me c anical has been a very pop ar subject amo ng student s in schools and shops numerous text b ooks h v b Thisshed on mecha cal drafting practice een publi b ook is added to the lis t b ecause the publishers believe hat ther has b een need for a treatise dealing more thoroughly with methods wh ch are actuall y managedemployed in wel dra f ting rooms M any b ooks on mechanical drawing have covered such subj ects as geome t cal d awing problems ortho g aph c pr o j ection the su facesdevelopment intersecting e tc b ut the application these principles and the real object mechanical d awin as rela ted machine and tool manu facture has b een dealt with vaguely in many instances The student has b een taught certain details but he has no t been given a clear concep tion the work draftsmen and de signers in the drafting roo s mac ne building plants T s b ook presents the subj ect in a way that wil enable the student to understand what the term mecha cal drawing eally mea ns in its broades t sense the essential f eatures of mo dern dra fting practice and the di ference b etween the mere epresenta tion of a design by a suitable drawing and the more valuab le work originating and developing the design itself special e ort has b een made to secure a well ba lanced trea tise in whi ch the various elements of mecha cal drawing are dealt with acc rding to their relative importance instance ttle space i s given lettering b ecause making fancy le tters in numerous styles is no t the work of a drafts man in a well managed drafting room although this subject has been greatly emphasized in many b ooks The aim has b een present method s whi ch are in actual use rather than exercises in d awing w ch do conform to the practice in

P m anufa cturing plants elab or te drawing a b evel gear with all the teeth accurately reproduced be an a ttractive and impressive feature in a text book cal drawing b ut it m sleading because working drawings are no t made in that way Thi s b ook in its arrangement and scope is based the assump tion that it is essential the student mechanical drawing whether in s chool in shop to understand the p rp ose dr wings as applied to machine and to ol cons truction how various mechanical devices may b e rep resented by means drawings the making drawings which comp letely and clearly how what they are supposed to and the relation b etween and p ecial attenti on has b een given to the di drawings and to the importance of using printed ins tructions any legitimate means of making a dra ing en tirely clear to the men in the shop In dealing wi th the nume ous de tails of the dra f tsman s work an e ort has b een made to present methods which are sanctioned b y common usage and to explain the reasons for the m ore imp ortant variations in practice accomplish this the m ethods and systems man y the representative dra f and much valuable informationwere studied ting rooms was also secured from a ticles pertaining to di ferent f eatures drafting pra ctice which have b een published in M Y Y k

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W any new improved fo m tool mac ne is being developed its general arrangement and the principle gover ng its operation use may b e quite clear in the mind the inventor originator and he may p roceed with the actual work construction guided only by a mental picture the device tools appliances could b e and some are produced in t s d rect way but it is evident hat such a method procedure is greatly restricted It is often easier the originator a new typ e mechanism build it with his hands than attemp t simp ly b y verbal descrip tion give some else clear enough ment l pic ture the device enable him construct it T s d rect method construction is course impractica b le as applied regular manu f acturin g In the fi would belace it rst p i possible riginate many the more complic ted mecha by simply f basicthem The mental picture orming a principle the device possibly its general arrangement m ght be entirely clear b determine the exactut in order relation the various parts when they are all properly portioned and assembled it is necessary make a f airl y accurate drawing uch drawing only shows the ar rangement the mecha sm whole b ut grea tly assists the designer in many cases in the development the idea Frequently the mental picture is istorted when an accu rate drawing is made it is apparent that changes are sar y and size more parts either in the form possibly in the entire arrangement the mechanism