{"id":148337,"date":"2026-05-11T15:11:28","date_gmt":"2026-05-11T13:11:28","guid":{"rendered":"https:\/\/xometry.pro\/articles\/first-angle-third-angle-projection\/"},"modified":"2026-05-28T23:05:44","modified_gmt":"2026-05-28T21:05:44","slug":"projection-europeenne-vs-projection-americaine","status":"publish","type":"articles","link":"https:\/\/xometry.pro\/fr\/articles\/projection-europeenne-vs-projection-americaine\/","title":{"rendered":"Projection europ\u00e9enne vs projection am\u00e9ricaine\u00a0: quelle diff\u00e9rence\u00a0?"},"content":{"rendered":"<div role=\"navigation\" aria-label=\"Table des mati\u00e8res\" class=\"simpletoc wp-block-simpletoc-toc\"><h2 class=\"simpletoc-title\">Table des mati\u00e8res<\/h2>\n<ul class=\"simpletoc-list\">\n<li><a href=\"#h-qu-est-ce-que-la-projection-orthogonale-nbsp\">Qu&rsquo;est-ce que la projection orthogonale&nbsp;?<\/a>\n<\/li>\n<li><a href=\"#h-projection-europeenne-vs-projection-americaine-les-diedres-de-projection\">Projection europ\u00e9enne vs projection am\u00e9ricaine : les di\u00e8dres de projection<\/a>\n<\/li>\n<li><a href=\"#h-projection-du-premier-diedre-norme-iso\">Projection du premier di\u00e8dre (norme ISO)<\/a>\n<\/li>\n<li><a href=\"#h-projection-du-troisieme-diedre-norme-asme\">Projection du troisi\u00e8me di\u00e8dre (norme ASME)<\/a>\n<\/li>\n<li><a href=\"#h-comparaison-des-vues-normalisees\">Comparaison des vues normalis\u00e9es<\/a>\n<\/li>\n<li><a href=\"#h-le-choix\">Le choix<\/a>\n<\/li><\/ul><\/div>\n\n\n<p class=\"wp-block-paragraph\">Qu&rsquo;il s&rsquo;agisse de sp\u00e9cifier des cotes simples ou des <a href=\"https:\/\/xometry.pro\/fr\/articles\/systeme-gdt-tolerancement-geometrique\/\">tol\u00e9rances g\u00e9om\u00e9triques complexes,<\/a> les deux m\u00e9thodes transmettent exactement les m\u00eames informations de fabrication, mais disposent les vues orthogonales en positions oppos\u00e9es sur la feuille de dessin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Comprendre la logique des deux m\u00e9thodes est essentiel pour \u00e9viter toute confusion, notamment lors de collaborations avec des partenaires internationaux.<\/p>\n\n\n\n<h2 id=\"h-qu-est-ce-que-la-projection-orthogonale-nbsp\" class=\"wp-block-heading\"><strong>Qu&rsquo;est-ce que la projection orthogonale ?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Si l&rsquo;on tente de coter directement un mod\u00e8le isom\u00e9trique 3D sur une feuille 2D, la perspective est d\u00e9form\u00e9e. Seules les lignes horizontales et verticales conservent leurs dimensions r\u00e9elles&nbsp;; il n&rsquo;est donc pas possible d&rsquo;utiliser l&rsquo;\u00e9chelle indiqu\u00e9e sur le dessin pour mesurer les lignes obliques. Par cons\u00e9quent, l&rsquo;ajout de cotes et de tol\u00e9rances de fabrication normalis\u00e9es sur des vues isom\u00e9triques est \u00e0 la fois impraticable et impr\u00e9cis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est pourquoi les ing\u00e9nieurs projettent les faces n\u00e9cessaires d&rsquo;une pi\u00e8ce sur des plans plats. Il existe deux plans de projection principaux : le plan <strong>horizontal<\/strong> et le plan <strong>vertical<\/strong>. Ces repr\u00e9sentations planes en 2D sont appel\u00e9es <strong>projections orthogonales<\/strong> (ou projections di\u00e8drales dans certaines r\u00e9gions).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1024\" height=\"544\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/3D-objects-translate-into-standard-2D-orthographic-views-1024x544.png\" alt=\"Sch\u00e9ma d'une pi\u00e8ce m\u00e9canique 3D plac\u00e9e dans un cube de projection transparent, illustrant comment les lignes de projection g\u00e9n\u00e8rent les vues de face, de dessus et de droite en 2D. \" class=\"wp-image-147192\" style=\"max-width:600px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/3D-objects-translate-into-standard-2D-orthographic-views-1024x544.png 1024w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/3D-objects-translate-into-standard-2D-orthographic-views-300x159.png 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/3D-objects-translate-into-standard-2D-orthographic-views-768x408.png 768w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/3D-objects-translate-into-standard-2D-orthographic-views.png 1415w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/3D-objects-translate-into-standard-2D-orthographic-views.png\" data-fancybox=\"gallery-148337\" data-caption=\"Le concept du \u00ab&nbsp;cube de projection&nbsp;\u00bb illustre comment les objets 3D se traduisent en vues orthogonales 2D normalis\u00e9es pour la fabrication.\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/3D-objects-translate-into-standard-2D-orthographic-views.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\"><em>Le concept du \u00ab&nbsp;cube de projection&nbsp;\u00bb illustre comment les objets 3D se traduisent en vues orthogonales 2D normalis\u00e9es pour la fabrication.<\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Un dessin en projection orthogonale complet peut comporter jusqu&rsquo;\u00e0 six vues normalis\u00e9es. Le plan vertical capture les <strong>vues de face, d&rsquo;arri\u00e8re et de c\u00f4t\u00e9<\/strong>, tandis que le plan horizontal capture les <strong>vues de dessus et de dessous<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En pla\u00e7ant la pi\u00e8ce entre l&rsquo;observateur et le plan de projection, l&rsquo;observation depuis diff\u00e9rentes directions g\u00e9n\u00e8re des projections planes restituant les dimensions r\u00e9elles sans distorsion de perspective.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"416\" height=\"472\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/orthographic-projection-principles.png\" alt=\" Mod\u00e8le CAO 3D d'une pi\u00e8ce usin\u00e9e illustrant les principes de la projection orthogonale.\n\" class=\"wp-image-147204\" style=\"max-width:300px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/orthographic-projection-principles.png 416w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/orthographic-projection-principles-264x300.png 264w\" sizes=\"(max-width: 416px) 100vw, 416px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/orthographic-projection-principles.png\" data-fancybox=\"gallery-148337\" data-caption=\"Exemple de pi\u00e8ce 3D illustrant le positionnement des vues en projection europ\u00e9enne et en projection am\u00e9ricaine.\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/orthographic-projection-principles.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Exemple de pi\u00e8ce 3D illustrant le positionnement des vues en projection europ\u00e9enne et en projection am\u00e9ricaine.<\/figcaption><\/figure>\n\n\n\n<h2 id=\"h-projection-europeenne-vs-projection-americaine-les-diedres-de-projection\" class=\"wp-block-heading\"><strong><strong>Projection europ\u00e9enne vs projection am\u00e9ricaine : les di\u00e8dres de projection<\/strong><\/strong><\/h2>\n\n\n<div class=\"custom-table-block \" id=\"table-id-994\" >\r\n\t<div class=\"search-input-wrapper\">\r\n\t\t<svg width=\"16\" height=\"16\" viewBox=\"0 0 16 16\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n\t\t\t<path d=\"M15.7812 13.833L12.6659 10.7177C12.5252 10.5771 12.3346 10.499 12.1347 10.499H11.6253C12.4877 9.39596 13.0002 8.00859 13.0002 6.49937C13.0002 2.90909 10.0911 0 6.50083 0C2.91056 0 0.00146484 2.90909 0.00146484 6.49937C0.00146484 10.0896 2.91056 12.9987 6.50083 12.9987C8.01006 12.9987 9.39742 12.4863 10.5004 11.6239V12.1332C10.5004 12.3332 10.5786 12.5238 10.7192 12.6644L13.8345 15.7797C14.1282 16.0734 14.6032 16.0734 14.8938 15.7797L15.778 14.8954C16.0718 14.6017 16.0718 14.1267 15.7812 13.833ZM6.50083 10.499C4.29167 10.499 2.50122 8.71165 2.50122 6.49937C2.50122 4.29021 4.28855 2.49976 6.50083 2.49976C8.70999 2.49976 10.5004 4.28708 10.5004 6.49937C10.5004 8.70852 8.71311 10.499 6.50083 10.499Z\" fill=\"#476175\"\/>\r\n\t\t<\/svg>\r\n\t\t<input type=\"search\" class=\"table-search-input\" id=\"table-search-994\" placeholder=\"Rechercher...\">\r\n\t<\/div>\t\r\n\t<div class=\"table-wrapper\">\r\n\t\t<table>\n<tbody>\n<tr>\n<td><b>\u00c9l\u00e9ment<\/b><\/td>\n<td><b>Projection du premier di\u00e8dre<\/b><\/td>\n<td><b>Projection du troisi\u00e8me di\u00e8dre<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Norme<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ISO 128<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASME Y14.3<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Zones d&rsquo;utilisation<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Europe, Asie, Inde<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00c9tats-Unis, Canada, Australie<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Principe de projection<\/span><\/td>\n<td><span style=\"font-weight: 400;\">La pi\u00e8ce entre l&rsquo;observateur et le plan de projection<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Le plan de projection entre l&rsquo;observateur et la pi\u00e8ce<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Position de la vue de dessus<\/span><\/td>\n<td><span style=\"font-weight: 400;\">En dessous de la vue de face<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Au-dessus de la vue de face<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Position de la vue de gauche<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00c0 droite de la vue de face<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00c0 gauche de la vue de face<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Position de la vue de droite<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00c0 gauche de la vue de face<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00c0 droite de la vue de face<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Intuitivit\u00e9<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Moins intuitive (au premier abord)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Plus intuitif<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n\t<\/div>\r\n<\/div>\r\n<style>\r\n\t.custom-table-block table{\r\n\t\theight: initial!important;\r\n\t}\r\n\t.search-input-wrapper{\r\n\t\tposition: relative;\r\n\t\tmargin-bottom: 24px;\r\n\t}\r\n\t.search-input-wrapper svg{\r\n\t\tposition: absolute;\r\n\t\ttop:50%;\r\n\t\tleft:12px;\r\n\t\ttransform: translateY(-50%);\r\n\t}\r\n\t.table-search-input{\r\n\t\tpadding: 0 0 0 40px;\r\n\t\tborder:1px solid #C1CAD1;\r\n\t\theight: 44px;\r\n\t\twidth: 201px;\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t}\r\n\t.table-search-input::placeholder{\r\n\t\tcolor:#092C47;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\ttext-align: left;\r\n\t\twhite-space:nowrap;\r\n\t}\r\n\t\r\n\t.custom-table-block thead{\r\n\t\tmargin-bottom: 14px;\r\n\t}\r\n\r\n\t.custom-table-block tbody tr:nth-child(odd){\r\n\t\tbackground-color: #F6F9FF;\r\n\t}\r\n\r\n\t.custom-table-block tbody, .custom-table-block thead, .custom-table-block tr, .custom-table-block td, .custom-table-block th{\r\n\t\theight: initial!important;\r\n\t}\r\n\t\r\n\t.custom-table-block tbody td{\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tpadding: 7px;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 700;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tcolor:#092C47;\r\n\t\tposition: relative;\r\n\t}\r\n\t.custom-table-block thead th:after{\r\n\t\tcontent:\"\";\r\n\t\tdisplay: inline-block;\r\n\t\tbackground-image: url(\"data:image\/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cpath d='M10.585 0.585938L6 5.17094L1.415 0.585938L0 2.00094L6 8.00094L12 2.00094L10.585 0.585938Z' fill='%23476175'\/%3E%3C\/svg%3E%0A\");\r\n\t\tmargin-left: 8px;\r\n\t\tbackground-position: center center;\r\n\t\tbackground-size: 12px 7.5px;\r\n\t\tbackground-repeat: no-repeat;\r\n\t\twidth: 24px;\r\n\t\theight: 12px;\r\n\t}\r\n\t.custom-table-block{\r\n\t\tmargin: 20px 0;\t\r\n\t}\r\n\t.custom-table-block .table-wrapper{\r\n\t\twidth: 100%;\r\n\t\toverflow-x: auto;\r\n\t}\r\n\t@media(max-width: 768px){\r\n\t\t\/* .custom-table-block tbody td{\r\n\t\t\twhite-space: nowrap;\r\n\t\t} *\/\r\n\t\t.custom-table-block .table-wrapper{\r\n\t\t\tmax-width: calc(100vw - 16px);\r\n\t\t}\r\n\t}\r\n<\/style>\r\n\n\n\n<p class=\"wp-block-paragraph\">Pour comprendre l&rsquo;arrangement des vues, imaginez les plans de projection vertical et horizontal se croisant pour former quatre di\u00e8dres.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Projection du premier di\u00e8dre :<\/strong> le mod\u00e8le 3D est plac\u00e9 dans le <strong>premier di\u00e8dre<\/strong>.<\/li>\n\n\n\n<li><strong>Projection du troisi\u00e8me di\u00e8dre :<\/strong> le mod\u00e8le 3D est plac\u00e9 dans le <strong>troisi\u00e8me di\u00e8dre<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">En <a href=\"https:\/\/xometry.pro\/fr\/articles\/preparer-dessin-technique\/\">dessin industriel<\/a>, ces deux plans sont conceptuellement \u00ab&nbsp;rabattus \u00e0 plat&nbsp;\u00bb afin que l&rsquo;ensemble des vues puisse \u00eatre imprim\u00e9 sur une seule feuille 2D.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1024\" height=\"652\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/vertical-and-horizontal-planes-1024x652.png\" alt=\"Sch\u00e9ma 3D repr\u00e9sentant des plans vertical et horizontal qui s\u2019intersectent pour diviser l'espace en quatre di\u00e8dres num\u00e9rot\u00e9s, avec des fl\u00e8ches indiquant le rabattement.\" class=\"wp-image-147216\" style=\"max-width:600px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/vertical-and-horizontal-planes-1024x652.png 1024w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/vertical-and-horizontal-planes-300x191.png 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/vertical-and-horizontal-planes-768x489.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/vertical-and-horizontal-planes.png\" data-fancybox=\"gallery-148337\" data-caption=\"Sch\u00e9ma fondamental illustrant les plans vertical et horizontal formant quatre di\u00e8dres pour la projection en dessin industriel.\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/vertical-and-horizontal-planes.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Sch\u00e9ma fondamental illustrant les plans vertical et horizontal formant quatre di\u00e8dres pour la projection en dessin industriel.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Why don&rsquo;t we use the <strong>second and fourth angles<\/strong>?&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pourquoi les <strong>deuxi\u00e8me et quatri\u00e8me di\u00e8dres<\/strong> ne sont-ils pas utilis\u00e9s&nbsp;?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En pratique, ils sont inutiles. Si l&rsquo;on place une pi\u00e8ce dans le deuxi\u00e8me ou le quatri\u00e8me di\u00e8dre et que l&rsquo;on rabat les plans, les vues verticale et horizontale se projettent exactement au m\u00eame endroit, se superposant et rendant le dessin illisible.<\/p>\n\n\n\n<h2 id=\"h-projection-du-premier-diedre-norme-iso\" class=\"wp-block-heading\"><strong>Projection du premier di\u00e8dre (norme ISO)<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La projection du premier di\u00e8dre, \u00e9galement appel\u00e9e projection europ\u00e9enne, est la m\u00e9thode dominante en <strong>Europe, en Inde et dans la majeure partie de l&rsquo;Asie<\/strong> ; elle est d\u00e9finie par la norme <a href=\"https:\/\/www.iso.org\/standard\/83356.html\" target=\"_blank\" rel=\"noreferrer noopener\">ISO 128-3<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans la projection du premier di\u00e8dre, la pi\u00e8ce est plac\u00e9e <strong>entre l&rsquo;observateur et le plan de projection<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bien que certains consid\u00e8rent cette m\u00e9thode comme l\u00e9g\u00e8rement moins intuitive, la logique en est simple&nbsp;: imaginez une pi\u00e8ce pos\u00e9e sur votre bureau. La face tourn\u00e9e vers vous constitue la <strong>vue de face<\/strong>, qui sert de r\u00e9f\u00e9rence au dessin.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Si l&rsquo;on bascule la pi\u00e8ce vers le bas, on obtient la vue de dessus. Par cons\u00e9quent, la <strong>vue de dessus<\/strong> est plac\u00e9e <em>en dessous<\/em> de la vue de face.<\/li>\n\n\n\n<li>Si l&rsquo;on bascule la pi\u00e8ce vers la droite, on obtient la vue de gauche. Par cons\u00e9quent, la <strong>vue de gauche<\/strong> est plac\u00e9e \u00e0 <em>droite<\/em> de la vue de face.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>La r\u00e8gle du premier di\u00e8dre :<\/strong> les vues sont projet\u00e9es du c\u00f4t\u00e9 <em>oppos\u00e9<\/em> \u00e0 la direction d&rsquo;observation.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"398\" height=\"258\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/first-angle-projection.png\" alt=\"\" class=\"wp-image-147228\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/first-angle-projection.png 398w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/first-angle-projection-300x194.png 300w\" sizes=\"(max-width: 398px) 100vw, 398px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/first-angle-projection.png\" data-fancybox=\"gallery-148337\" data-caption=\"\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/first-angle-projection.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Le symbole&nbsp;:<\/strong> tout dessin industriel indique sa m\u00e9thode de projection dans le cartouche. Le symbole de projection du premier di\u00e8dre repr\u00e9sente les vues de c\u00f4t\u00e9 et de dessus d&rsquo;un c\u00f4ne tronqu\u00e9, la base large du c\u00f4ne \u00e9tant orient\u00e9e <em>vers<\/em> la vue de dessus.<\/p>\n<\/div>\n<\/div>\n\n\n\n<h2 id=\"h-projection-du-troisieme-diedre-norme-asme\" class=\"wp-block-heading\"><strong>Projection du troisi\u00e8me di\u00e8dre (norme ASME)<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La projection du troisi\u00e8me di\u00e8dre, \u00e9galement appel\u00e9e projection am\u00e9ricaine, est la m\u00e9thode en vigueur aux <strong>\u00c9tats-Unis, au Canada, au Japon et en Australie<\/strong>. Elle est d\u00e9finie par la norme <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/y14-3-orthographic-pictorial-views\" target=\"_blank\" rel=\"noreferrer noopener\">ASME Y14.3<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans la projection du troisi\u00e8me di\u00e8dre, le <strong>plan de projection s&rsquo;interpose entre l&rsquo;observateur et la pi\u00e8ce<\/strong> (imaginez observer la pi\u00e8ce \u00e0 travers un cube de projection transparent).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le plan de projection \u00e9tant plac\u00e9 devant la pi\u00e8ce, les vues sont dispos\u00e9es du <em>m\u00eame c\u00f4t\u00e9<\/em> que la direction d&rsquo;observation.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>On observe la pi\u00e8ce par le dessus, et on repr\u00e9sente la <strong>vue de dessus<\/strong> <em>au-dessus<\/em> de la vue de face.<\/li>\n\n\n\n<li>On observe la pi\u00e8ce par la droite, et on repr\u00e9sente la <strong>vue de droite<\/strong> \u00e0 <em>droite<\/em> de la vue de face.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>La r\u00e8gle du troisi\u00e8me di\u00e8dre&nbsp;:<\/strong> les vues sont projet\u00e9es du <em>m\u00eame<\/em> c\u00f4t\u00e9 que celui depuis lequel on observe la pi\u00e8ce. La majorit\u00e9 des ing\u00e9nieurs contemporains consid\u00e8rent cette disposition comme particuli\u00e8rement intuitive.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"398\" height=\"258\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/third-angle-projectio.png\" alt=\"\" class=\"wp-image-147240\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/third-angle-projectio.png 398w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/third-angle-projectio-300x194.png 300w\" sizes=\"(max-width: 398px) 100vw, 398px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/third-angle-projectio.png\" data-fancybox=\"gallery-148337\" data-caption=\"\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/third-angle-projectio.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Le symbole&nbsp;:<\/strong> le symbole de projection du troisi\u00e8me di\u00e8dre repr\u00e9sente deux cercles concentriques, le plus petit diam\u00e8tre de la vue lat\u00e9rale \u00e9tant orient\u00e9 <em>\u00e0 l&rsquo;oppos\u00e9<\/em> de la vue de dessus.<\/p>\n<\/div>\n<\/div>\n\n\n\n<h2 id=\"h-comparaison-des-vues-normalisees\" class=\"wp-block-heading\"><strong>Comparaison des vues normalis\u00e9es<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">On passe en revue les principales vues orthogonales afin d&rsquo;en examiner les diff\u00e9rences pratiques c\u00f4te \u00e0 c\u00f4te.<\/p>\n\n\n\n<h3 id=\"h-nbsp-nbsp-vue-de-face\" class=\"wp-block-heading\"><strong> <\/strong> <strong>Vue de face<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"327\" height=\"306\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/front-view-projection.png\" alt=\"vue de face issue d'un dessin industriel\" class=\"wp-image-147252\" style=\"max-width:300px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/front-view-projection.png 327w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/front-view-projection-300x281.png 300w\" sizes=\"(max-width: 327px) 100vw, 327px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/front-view-projection.png\" data-fancybox=\"gallery-148337\" data-caption=\"vue de face issue d&#039;un dessin industriel\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/front-view-projection.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">vue de face issue d&rsquo;un dessin industriel<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">La vue de face constitue le point de d\u00e9part de tout dessin en projection orthogonale. Elle doit \u00eatre choisie de mani\u00e8re \u00e0 mettre en \u00e9vidence les \u00e9l\u00e9ments les plus repr\u00e9sentatifs ou fonctionnels de la pi\u00e8ce, en restituant g\u00e9n\u00e9ralement sa longueur et sa hauteur globales. Comme elle est la r\u00e9f\u00e9rence de toutes les autres projections, <strong>la vue de face occupe la m\u00eame position dans la projection du premier di\u00e8dre comme dans celle du troisi\u00e8me di\u00e8dre.<\/strong><\/p>\n\n\n\n<h3 id=\"h-vue-de-cote\" class=\"wp-block-heading\"><strong><strong>Vue de c\u00f4t\u00e9<\/strong><\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"464\" height=\"453\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/side-view-first-thrid-angle.png\" alt=\"l'image ci-dessus repr\u00e9sente la projection du premier di\u00e8dre en haut, et celle du troisi\u00e8me di\u00e8dre en bas.\" class=\"wp-image-147264\" style=\"max-width:500px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/side-view-first-thrid-angle.png 464w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/side-view-first-thrid-angle-300x293.png 300w\" sizes=\"(max-width: 464px) 100vw, 464px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/side-view-first-thrid-angle.png\" data-fancybox=\"gallery-148337\" data-caption=\"l&#039;image ci-dessus repr\u00e9sente la projection du premier di\u00e8dre en haut, et celle du troisi\u00e8me di\u00e8dre en bas.\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/side-view-first-thrid-angle.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">l&rsquo;image ci-dessus repr\u00e9sente la projection du premier di\u00e8dre en haut, et celle du troisi\u00e8me di\u00e8dre en bas.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">La vue de c\u00f4t\u00e9 apporte des informations sur la profondeur, ce que la vue de face ne peut pas restituer. Une vue en coupe ou des lignes cach\u00e9es seraient n\u00e9cessaires pour coter la profondeur de la rainure.<\/p>\n\n\n\n<h3 id=\"h-vue-de-dessus\" class=\"wp-block-heading\"><strong>Vue de dessus<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"480\" height=\"434\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/top-view-first-thrid-angle.png\" alt=\"la projection du premier di\u00e8dre est \u00e0 gauche et celle du troisi\u00e8me di\u00e8dre \u00e0 droite de la ligne de s\u00e9paration.\n\" class=\"wp-image-147276\" style=\"max-width:500px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/top-view-first-thrid-angle.png 480w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/top-view-first-thrid-angle-300x271.png 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/top-view-first-thrid-angle.png\" data-fancybox=\"gallery-148337\" data-caption=\"la projection du premier di\u00e8dre est \u00e0 gauche et celle du troisi\u00e8me di\u00e8dre \u00e0 droite de la ligne de s\u00e9paration.\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/top-view-first-thrid-angle.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">la projection du premier di\u00e8dre est \u00e0 gauche et celle du troisi\u00e8me di\u00e8dre \u00e0 droite de la ligne de s\u00e9paration.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">La vue de dessus repr\u00e9sente les \u00e9l\u00e9ments visibles depuis le dessus. Dans cet exemple, la face sup\u00e9rieure ne pr\u00e9sente aucun \u00e9l\u00e9ment. Il serait donc judicieux d&rsquo;omettre cette vue du dessin principal afin de ne pas surcharger la repr\u00e9sentation.<\/p>\n\n\n\n<h3 id=\"h-vue-de-dessous\" class=\"wp-block-heading\"><strong>Vue de dessous<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"499\" height=\"380\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/bottom-view-first-thrid-angle.png\" alt=\"Projection du premier di\u00e8dre \u00e0 gauche, projection du troisi\u00e8me di\u00e8dre \u00e0 droite.\" class=\"wp-image-147288\" style=\"max-width:500px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/bottom-view-first-thrid-angle.png 499w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/bottom-view-first-thrid-angle-300x228.png 300w\" sizes=\"(max-width: 499px) 100vw, 499px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/bottom-view-first-thrid-angle.png\" data-fancybox=\"gallery-148337\" data-caption=\"Projection du premier di\u00e8dre \u00e0 gauche, projection du troisi\u00e8me di\u00e8dre \u00e0 droite.\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/bottom-view-first-thrid-angle.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Projection du premier di\u00e8dre \u00e0 gauche, projection du troisi\u00e8me di\u00e8dre \u00e0 droite.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">La vue de dessous repr\u00e9sente les \u00e9l\u00e9ments situ\u00e9s sur la face inf\u00e9rieure. Par exemple, si une pi\u00e8ce poss\u00e8de des pieds cylindriques, la vue de face ne repr\u00e9sentera que des blocs rectangulaires, tandis que la vue de dessous restituera leur profil circulaire r\u00e9el.<\/p>\n\n\n\n<h3 id=\"h-vues-auxiliaires\" class=\"wp-block-heading\"><strong>Vues auxiliaires<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"467\" height=\"462\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/auxiliary-views-first-thrid-angle.png\" alt=\"Vues auxiliaires\" class=\"wp-image-147300\" style=\"max-width:500px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/auxiliary-views-first-thrid-angle.png 467w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/auxiliary-views-first-thrid-angle-300x297.png 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/auxiliary-views-first-thrid-angle-84x84.png 84w, https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/auxiliary-views-first-thrid-angle-102x102.png 102w\" sizes=\"(max-width: 467px) 100vw, 467px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/auxiliary-views-first-thrid-angle.png\" data-fancybox=\"gallery-148337\" data-caption=\"Vues auxiliaires\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"0><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/auxiliary-views-first-thrid-angle.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Vues auxiliaires<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Il arrive que les vues orthogonales normalis\u00e9es ne permettent pas de repr\u00e9senter sans distorsion un \u00e9l\u00e9ment \u00e0 g\u00e9om\u00e9trie complexe inclin\u00e9e. Le mod\u00e8le actuel n\u00e9cessiterait donc une vue auxiliaire suppl\u00e9mentaire pour restituer les vraies proportions de la rainure. Les vues auxiliaires \u00e9tant ind\u00e9pendantes de la disposition normalis\u00e9e des di\u00e8dres, elles occupent la m\u00eame position dans les deux syst\u00e8mes de projection.<\/p>\n\n\n\n<h3 id=\"h-vue-isometrique\" class=\"wp-block-heading\"><strong><strong>Vue isom\u00e9trique<\/strong><\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"248\" height=\"281\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/isometric-view.png\" alt=\"Vue isom\u00e9trique\" class=\"wp-image-147312\" style=\"max-width:400px\"\/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/isometric-view.png\" data-fancybox=\"gallery-148337\" data-caption=\"\" aria-label=\"Ouvrir l&#039;image compl\u00e8te\"1><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2026\/05\/isometric-view.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">La vue isom\u00e9trique est une projection plane optionnelle dans laquelle les trois axes spatiaux sont s\u00e9par\u00e9s par un angle de 120 degr\u00e9s. Elle offre au technicien d&rsquo;usinage une vue d&rsquo;ensemble tridimensionnelle rapide et visuelle de la pi\u00e8ce. <strong>Les vues isom\u00e9triques ne sont jamais cot\u00e9es.<\/strong><\/p>\n\n\n\n<h3 id=\"h-bonnes-pratiques-nbsp-projection-du-premier-diedre-et-projection-du-troisieme-diedre\" class=\"wp-block-heading\"><strong>Bonnes pratiques : projection du premier di\u00e8dre et projection du troisi\u00e8me di\u00e8dre<\/strong><\/h3>\n\n\n<div class=\"custom-table-block \" id=\"table-id-733\" >\r\n\t<div class=\"search-input-wrapper\">\r\n\t\t<svg width=\"16\" height=\"16\" viewBox=\"0 0 16 16\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n\t\t\t<path d=\"M15.7812 13.833L12.6659 10.7177C12.5252 10.5771 12.3346 10.499 12.1347 10.499H11.6253C12.4877 9.39596 13.0002 8.00859 13.0002 6.49937C13.0002 2.90909 10.0911 0 6.50083 0C2.91056 0 0.00146484 2.90909 0.00146484 6.49937C0.00146484 10.0896 2.91056 12.9987 6.50083 12.9987C8.01006 12.9987 9.39742 12.4863 10.5004 11.6239V12.1332C10.5004 12.3332 10.5786 12.5238 10.7192 12.6644L13.8345 15.7797C14.1282 16.0734 14.6032 16.0734 14.8938 15.7797L15.778 14.8954C16.0718 14.6017 16.0718 14.1267 15.7812 13.833ZM6.50083 10.499C4.29167 10.499 2.50122 8.71165 2.50122 6.49937C2.50122 4.29021 4.28855 2.49976 6.50083 2.49976C8.70999 2.49976 10.5004 4.28708 10.5004 6.49937C10.5004 8.70852 8.71311 10.499 6.50083 10.499Z\" fill=\"#476175\"\/>\r\n\t\t<\/svg>\r\n\t\t<input type=\"search\" class=\"table-search-input\" id=\"table-search-733\" placeholder=\"Rechercher...\">\r\n\t<\/div>\t\r\n\t<div class=\"table-wrapper\">\r\n\t\t<table>\n<tbody>\n<tr>\n<td><b>Sc\u00e9nario<\/b><\/td>\n<td><b>Bonnes pratiques applicables<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Avant d&rsquo;utiliser un dessin<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Rep\u00e9rer le symbole de projection dans le cartouche.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00e9rifier la norme en vigueur (ISO vs. ASME).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Confirmer aupr\u00e8s du fournisseur ou du client en cas d&rsquo;ambigu\u00eft\u00e9.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Lors de la cr\u00e9ation des dessins<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Choisir la m\u00e9thode de projection en fonction de la r\u00e9gion cible et du partenaire de fabrication.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Maintenir une disposition et une m\u00e9thode de projection strictement coh\u00e9rentes dans l&rsquo;ensemble du dossier de plans.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Dans un contexte de travail international<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ne pas supposer que les partenaires internationaux appliquent les m\u00eames normes locales.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Indiquer clairement la m\u00e9thode de projection dans le cartouche, la documentation associ\u00e9e et les communications.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Lors de l&rsquo;utilisation d&rsquo;un logiciel de CAO<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Se familiariser avec la proc\u00e9dure de bascule entre premier di\u00e8dre et troisi\u00e8me di\u00e8dre dans le logiciel CAO utilis\u00e9.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Veiller \u00e0 exporter les dessins finaux avec le param\u00e8tre de projection correct appliqu\u00e9 et le symbole clairement visible.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n\t<\/div>\r\n<\/div>\r\n<style>\r\n\t.custom-table-block table{\r\n\t\theight: initial!important;\r\n\t}\r\n\t.search-input-wrapper{\r\n\t\tposition: relative;\r\n\t\tmargin-bottom: 24px;\r\n\t}\r\n\t.search-input-wrapper svg{\r\n\t\tposition: absolute;\r\n\t\ttop:50%;\r\n\t\tleft:12px;\r\n\t\ttransform: translateY(-50%);\r\n\t}\r\n\t.table-search-input{\r\n\t\tpadding: 0 0 0 40px;\r\n\t\tborder:1px solid #C1CAD1;\r\n\t\theight: 44px;\r\n\t\twidth: 201px;\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t}\r\n\t.table-search-input::placeholder{\r\n\t\tcolor:#092C47;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\ttext-align: left;\r\n\t\twhite-space:nowrap;\r\n\t}\r\n\t\r\n\t.custom-table-block thead{\r\n\t\tmargin-bottom: 14px;\r\n\t}\r\n\r\n\t.custom-table-block tbody tr:nth-child(odd){\r\n\t\tbackground-color: #F6F9FF;\r\n\t}\r\n\r\n\t.custom-table-block tbody, .custom-table-block thead, .custom-table-block tr, .custom-table-block td, .custom-table-block th{\r\n\t\theight: initial!important;\r\n\t}\r\n\t\r\n\t.custom-table-block tbody td{\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tpadding: 7px;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 700;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tcolor:#092C47;\r\n\t\tposition: relative;\r\n\t}\r\n\t.custom-table-block thead th:after{\r\n\t\tcontent:\"\";\r\n\t\tdisplay: inline-block;\r\n\t\tbackground-image: url(\"data:image\/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cpath d='M10.585 0.585938L6 5.17094L1.415 0.585938L0 2.00094L6 8.00094L12 2.00094L10.585 0.585938Z' fill='%23476175'\/%3E%3C\/svg%3E%0A\");\r\n\t\tmargin-left: 8px;\r\n\t\tbackground-position: center center;\r\n\t\tbackground-size: 12px 7.5px;\r\n\t\tbackground-repeat: no-repeat;\r\n\t\twidth: 24px;\r\n\t\theight: 12px;\r\n\t}\r\n\t.custom-table-block{\r\n\t\tmargin: 20px 0;\t\r\n\t}\r\n\t.custom-table-block .table-wrapper{\r\n\t\twidth: 100%;\r\n\t\toverflow-x: auto;\r\n\t}\r\n\t@media(max-width: 768px){\r\n\t\t\/* .custom-table-block tbody td{\r\n\t\t\twhite-space: nowrap;\r\n\t\t} *\/\r\n\t\t.custom-table-block .table-wrapper{\r\n\t\t\tmax-width: calc(100vw - 16px);\r\n\t\t}\r\n\t}\r\n<\/style>\r\n\n\n\n<h2 id=\"h-le-choix\" class=\"wp-block-heading\"><strong>Le choix<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le choix entre la projection du premier di\u00e8dre et celle du troisi\u00e8me di\u00e8dre repose enti\u00e8rement sur les conventions r\u00e9gionales. L&rsquo;Europe et l&rsquo;Asie utilisent majoritairement la projection du premier di\u00e8dre, tandis que l&rsquo;Am\u00e9rique du Nord et l&rsquo;Australie s&rsquo;appuient sur celle du troisi\u00e8me di\u00e8dre. Aucun des deux syst\u00e8mes ne pr\u00e9sente d&rsquo;avantage technique intrins\u00e8que par rapport \u00e0 l&rsquo;autre.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour un ing\u00e9nieur ou un concepteur, ce qui importe avant tout, c&rsquo;est la <strong>coh\u00e9rence<\/strong>. Indiquer syst\u00e9matiquement la m\u00e9thode de projection dans le <a href=\"https:\/\/xometry.pro\/fr\/articles\/preparer-dessin-technique\/\">cartouche du dessin industriel<\/a> et s&rsquo;y tenir dans l&rsquo;ensemble du dossier de plans. Lorsqu&rsquo;on fournit des dessins \u00e0 un client \u00e0 l&rsquo;\u00e9tranger ou \u00e0 un partenaire de fabrication international tel que Xometry, il convient de confirmer le syst\u00e8me que leurs techniciens d&rsquo;usinage s&rsquo;attendent \u00e0 recevoir.<\/p>\n","protected":false},"author":2899,"featured_media":147184,"comment_status":"open","ping_status":"closed","template":"","categories":[],"c-tag-articles":[],"global-tag":[692],"class_list":["post-148337","articles","type-articles","status-publish","has-post-thumbnail","hentry","global-tag-design-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Projection europ\u00e9enne vs projection am\u00e9ricaine\u00a0: quelle diff\u00e9rence\u00a0? | Xometry Pro<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez les diff\u00e9rences exactes entre la projection europ\u00e9enne et la projection am\u00e9ricaine. 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