{"id":2933,"date":"2026-06-14T09:31:26","date_gmt":"2026-06-14T01:31:26","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=2933"},"modified":"2026-06-14T09:31:28","modified_gmt":"2026-06-14T01:31:28","slug":"how-is-the-accuracy-grade-of-granite-parallel-rulers-classified","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/fr\/2026\/06\/14\/how-is-the-accuracy-grade-of-granite-parallel-rulers-classified\/","title":{"rendered":"Comment est class\u00e9e la pr\u00e9cision des r\u00e8gles parall\u00e8les en granit ?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Classification par degr\u00e9 de pr\u00e9cision des r\u00e8gles parall\u00e8les en granit (r\u00e8gles droites en granit)<br>La norme technique nationale JB\/T 7878-2017 \u201c R\u00e8gles en pierre \u201d les classe en trois cat\u00e9gories : cat\u00e9gorie 00, cat\u00e9gorie 0 et cat\u00e9gorie 1, en fonction de tol\u00e9rances g\u00e9om\u00e9triques telles que la rectitude, le parall\u00e9lisme de la surface de travail et la plan\u00e9it\u00e9. La classe 00 pr\u00e9sente la plus grande pr\u00e9cision, tandis que la classe 1 pr\u00e9sente la plus faible.<br>I. Indicateurs cl\u00e9s de d\u00e9termination (Unit\u00e9 : \u03bcm, sur la base de la longueur L de la r\u00e8gle)<br>La valeur de tol\u00e9rance augmente avec la longueur du corps de la r\u00e8gle. Le tableau ci-dessous indique la tol\u00e9rance de rectitude (principal indicateur de pr\u00e9cision) correspondant aux longueurs courantes ; la tol\u00e9rance de parall\u00e9lisme est \u00e9gale \u00e0 la tol\u00e9rance de rectitude :<br>Tableau<br>Longueur nominale L (mm) Classe 00 Classe 0 Classe 1<br>200 1.0 2.0 4.0<br>300 1.5 3.0 6.0<br>400 2.0 4.0 8.0<br>500 2.5 5.0 10.0<br>630 3.0 6.0 12.0<br>800 4.0 8.0 16.0<br>1000 5.0 10.0 20.0<br>1200 6.0 12.0 24.0<br>1600 8.0 16.0 32.0<br>2000 10.0 20.0 40.0<br>Ajout : La tol\u00e9rance de plan\u00e9it\u00e9 de la surface de travail est \u00e9gale \u00e0 1,5 fois la tol\u00e9rance de rectitude de la classe correspondante.<br>II. Diff\u00e9renciation dans l'attribution des notes<br>Grade 00 (ultra-haute pr\u00e9cision)<br>Salles de m\u00e9trologie, organismes de contr\u00f4le ind\u00e9pendants, \u00e9talonnage de machines \u00e0 mesurer tridimensionnelles (MMT) et d\u2019instruments de pr\u00e9cision, transfert de valeurs de haute pr\u00e9cision, utilis\u00e9s dans des environnements \u00e0 temp\u00e9rature constante.<br>Classe 0 (classe de pr\u00e9cision)<br>Contr\u00f4le de machines-outils de pr\u00e9cision, contr\u00f4le de composants de pr\u00e9cision, industrie des moules, postes de contr\u00f4le de haute pr\u00e9cision dans les ateliers.<br>Classe 1 (classe de pr\u00e9cision g\u00e9n\u00e9rale)<br>Mise en service g\u00e9n\u00e9rale des machines-outils, contr\u00f4le g\u00e9n\u00e9ral des pi\u00e8ces m\u00e9caniques, mise \u00e0 niveau des \u00e9quipements, inspections de routine sur site.<br>III. Notes compl\u00e9mentaires<br>Les produits \u00e9trangers se r\u00e9f\u00e8rent pour la plupart aux normes ISO. L'\u00e9tiquetage des nuances peut pr\u00e9senter de l\u00e9g\u00e8res diff\u00e9rences, mais la logique des tol\u00e9rances correspond globalement \u00e0 la norme nationale.<br>Les essais de pr\u00e9cision doivent \u00eatre r\u00e9alis\u00e9s dans un environnement normalis\u00e9 \u00e0 temp\u00e9rature constante de <strong>20 \u00b0C \u00b1 2 \u00b0C<\/strong>. Les variations de temp\u00e9rature auront une incidence directe sur les valeurs mesur\u00e9es.<br>Pour les r\u00e8gles parall\u00e8les utilis\u00e9es par paires, outre la pr\u00e9cision de chaque r\u00e8gle prise individuellement, le parall\u00e9lisme de l'ensemble sera \u00e9galement contr\u00f4l\u00e9 et v\u00e9rifi\u00e9.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745.png\" alt=\"\" class=\"wp-image-2934\" srcset=\"https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745.png 800w, https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745-300x300.png 300w, https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745-150x150.png 150w, https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745-768x768.png 768w, https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745-12x12.png 12w, https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745-100x100.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>","protected":false},"excerpt":{"rendered":"<p>Classification par classe de pr\u00e9cision des r\u00e8gles parall\u00e8les en granit (R\u00e8gles en granit) La norme nationale JB\/T 7878-2017 \u201c R\u00e8gles en pierre \u201d les classe en trois grades : Grade 00, Grade 0 et Grade 1, en fonction de tol\u00e9rances g\u00e9om\u00e9triques telles que la rectitude, le parall\u00e9lisme de la surface de travail et la plan\u00e9it\u00e9. La classe 00 pr\u00e9sente la plus grande pr\u00e9cision, tandis que la classe 1 pr\u00e9sente la plus faible. I. Indicateurs cl\u00e9s de d\u00e9termination\u2026<\/p>","protected":false},"author":1,"featured_media":2934,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-2933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"taxonomy_info":{"category":[{"value":35,"label":"NEWS"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260613-101745.png",800,800,false],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/fr\/author\/jtlcnc\/"},"comment_info":0,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":425,"filter":"raw","cat_ID":35,"category_count":425,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2933","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/comments?post=2933"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2933\/revisions"}],"predecessor-version":[{"id":2935,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2933\/revisions\/2935"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/2934"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=2933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=2933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=2933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}