{"id":2074,"date":"2026-03-10T09:03:18","date_gmt":"2026-03-10T01:03:18","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=2074"},"modified":"2026-03-10T09:03:20","modified_gmt":"2026-03-10T01:03:20","slug":"what-factors-affect-the-coaxiality-of-coordinate-measuring-machines","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/fr\/2026\/03\/10\/what-factors-affect-the-coaxiality-of-coordinate-measuring-machines\/","title":{"rendered":"Quels sont les facteurs qui influencent la coaxialit\u00e9 des machines \u00e0 mesurer tridimensionnelles ?"},"content":{"rendered":"

Les facteurs affectant la coaxialit\u00e9 des machines \u00e0 mesurer tridimensionnelles (MMT) se r\u00e9sument essentiellement \u00e0 : un axe impr\u00e9cis, des pi\u00e8ces instables, l'impr\u00e9cision de la machine, un environnement instable et des m\u00e9thodes inappropri\u00e9es. J'ai rassembl\u00e9 ces informations dans la version la plus pratique et la plus pr\u00eate \u00e0 l'emploi pour l'atelier, sans \u00e9rosion inutile.<\/p>\n\n\n\n

I. Pr\u00e9cision inh\u00e9rente \u00e0 la machine (cause fondamentale)
Pr\u00e9cision g\u00e9om\u00e9trique
Perpendicularit\u00e9, rectitude, tangage et lacet des trois axes
Erreur d'indexation de la table\/tournebroche (extr\u00eamement influente lorsqu'elle est pr\u00e9sente)
Syst\u00e8me de sonde
Extensions de stylet pli\u00e9es, courb\u00e9es ou d\u00e9form\u00e9es
Mauvaise r\u00e9p\u00e9tabilit\u00e9 de la sonde, ventouses ou adaptateurs de calibrage impr\u00e9cis
Mouvement et transmission
Usure des guides, variation du jeu des paliers \u00e0 air
Vibration des vis, des courroies ou des moteurs<\/p>\n\n\n\n

II. Ateliers et agencements (les plus fr\u00e9quents dans l'atelier)
Positionnement de la pi\u00e8ce
Surfaces de r\u00e9f\u00e9rence in\u00e9gales, bavures ou salet\u00e9s
Hauteur in\u00e9gale des cales, distribution in\u00e9gale de la force
D\u00e9formation de la pi\u00e8ce
Affaissement de pi\u00e8ces \u00e0 parois minces ou d'arbres longs en raison du poids propre
Lib\u00e9ration des contraintes internes, d\u00e9formation thermique
Serrage Trop serr\u00e9 \u2192 d\u00e9formation
Fixation trop l\u00e2che \u2192 micro-mouvement pendant la mesure<\/p>\n\n\n\n

III. Environnement (la coaxialit\u00e9 est une tol\u00e9rance de forme et de position, extr\u00eamement sensible)
Temp\u00e9rature
Diff\u00e9rences locales (soleil, ventilateurs, chaleur corporelle)
Incoh\u00e9rence de temp\u00e9rature entre la pi\u00e8ce et la machine
Gradients de temp\u00e9rature provoquant une micro-d\u00e9formation des colonnes et des tables
Vibrations
Vibration du sol par les machines-outils, mouvement du personnel
Isolation insuffisante contre les vibrations \u2192 d\u00e9rive de l'ajustement de l'axe
Propret\u00e9
Poussi\u00e8re, copeaux, huile \u2192 points de mesure d\u00e9form\u00e9s<\/p>\n\n\n\n

IV. M\u00e9thode de mesure et ms (d\u00e9termine le succ\u00e8s ou l'\u00e9chec)
Strat\u00e9gie d'\u00e9chantillonnage ponctuel
Trop peu de sections transversales \u2192 ajustement impr\u00e9cis
Points \u00e9chantillonn\u00e9s trop pr\u00e8s les uns des autres, distribution in\u00e9gale
Mesure d'une seule extr\u00e9mit\u00e9, sur toute la longueur
\u00c9tablissement du point de r\u00e9f\u00e9rence
S\u00e9lection incorrecte du point de r\u00e9f\u00e9rence
Cylindre de r\u00e9f\u00e9rence trop court ou impr\u00e9cis
Algorithme d'ajustement
Utilisation mixte de la m\u00e9thode des moindres carr\u00e9s, de la m\u00e9thode de l'inscription maximale et de la m\u00e9thode de l'inscription maximale.
Param\u00e8tres logiciels incoh\u00e9rents entra\u00eenant des fluctuations de r\u00e9sultats<\/p>\n\n\n\n

V. Influence de la table\/lit en granit (la partie la plus importante)
Plan\u00e9it\u00e9 du tableau
Affecte directement la surface du point de r\u00e9f\u00e9rence de la pi\u00e8ce ; si le point de r\u00e9f\u00e9rence est biais\u00e9, la coaxialit\u00e9 ne sera pas respect\u00e9e.
Stabilit\u00e9 de la base
Le granit a une faible dilatation thermique, mais un support in\u00e9gal, des pieds de nivellement mal fix\u00e9s ou des fluctuations peuvent entra\u00eener une d\u00e9rive de la g\u00e9om\u00e9trie globale de la machine.
Amortissement des vibrations
Le granit a de bonnes propri\u00e9t\u00e9s d'amortissement ; cependant, une mauvaise isolation des vibrations ou une mauvaise fondation peuvent encore ruiner la coaxialit\u00e9 m<\/p>\n\n\n\n

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Oplus_131072<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"

Factors affecting the coaxiality of Coordinate Measuring Machines (CMMs) essentially boil down to: inaccurate axint, unstable workpieces, machine inaccuracy, unstable environment, and improper methods. I have compiled this into the most practical, ready-to-use version for the shop floor, without unnecessary erbosity. I. Machine Inherent Accuracy (Root Cause)Geometric AccuracyPerpendicularity, straightness, pitch, and yaw of the three…<\/p>","protected":false},"author":1,"featured_media":2077,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_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-2074","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\/03\/\u5e73\u53f0\u5e94\u75289-2-870x1024.jpg",870,1024,true],"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":121,"filter":"raw","cat_ID":35,"category_count":121,"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\/2074","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=2074"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2074\/revisions"}],"predecessor-version":[{"id":2078,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2074\/revisions\/2078"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/2077"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=2074"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=2074"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=2074"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}