{"id":1985,"date":"2026-09-02T11:11:53","date_gmt":"2026-09-02T03:11:53","guid":{"rendered":"https:\/\/www.jccncmachining.com\/?p=1985"},"modified":"2026-09-01T15:23:26","modified_gmt":"2026-09-01T07:23:26","slug":"finition-de-surface-en-usinage-cnc","status":"publish","type":"post","link":"https:\/\/www.jccncmachining.com\/fr\/blog\/cnc-machining-surface-finishes\/","title":{"rendered":"Votre Finition CNC Fera-t-elle l'Affaire ? Choisir le Traitement de Surface selon la Fonction"},"content":{"rendered":"<article class=\"blog-post\">\n<p class=\"lead\" style=\"font-size: 20px; line-height: 2em; text-align: left;\">Une pi\u00e8ce CNC n'est pas finie simplement parce qu'elle est sortie de la machine. La surface peut devoir r\u00e9sister \u00e0 la corrosion, r\u00e9duire le frottement, assurer l'\u00e9tanch\u00e9it\u00e9, recevoir un rev\u00eatement, offrir un aspect sp\u00e9cifique ou pr\u00e9server une dimension critique. La bonne finition de surface d\u00e9pend du mat\u00e9riau, de la fonction, de l'environnement, de la g\u00e9om\u00e9trie, des tol\u00e9rances, de la quantit\u00e9 et du budget. Choisir uniquement en fonction de l'apparence peut cr\u00e9er des probl\u00e8mes d'adh\u00e9rence, des variations dimensionnelles, des co\u00fbts inutiles ou une surface qui semble belle mais qui \u00e9choue en service.<\/p>\n<nav class=\"table-of-contents\" aria-label=\"Table des mati\u00e8res\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Feuille de route pour le choix de la finition de surface<\/h2>\n<ul>\n<li><a href=\"#purpose\">Commencez par ce que la surface doit faire<\/a><\/li>\n<li><a href=\"#baseline\">L'\u00e9tat brut d'usinage est un v\u00e9ritable choix d'ing\u00e9nierie<\/a><\/li>\n<li><a href=\"#mechanical\">Finitions m\u00e9caniques pour la texture et l'aspect<\/a><\/li>\n<li><a href=\"#chemical\">Finitions chimiques et \u00e9lectrochimiques<\/a><\/li>\n<li><a href=\"#coating\">Rev\u00eatements, placage et contr\u00f4le dimensionnel<\/a><\/li>\n<li><a href=\"#roughness\">Ra, Rz et la question de l'inspection<\/a><\/li>\n<li><a href=\"#material\">La compatibilit\u00e9 des mat\u00e9riaux passe en premier<\/a><\/li>\n<li><a href=\"#specify\">Comment sp\u00e9cifier une finition sur un dessin<\/a><\/li>\n<li><a href=\"#cost\">Finition, co\u00fbt et risque de production<\/a><\/li>\n<li><a href=\"#faq\">FAQ sur les finitions de surface CNC<\/a><\/li>\n<\/ul>\n<\/nav>\n<section id=\"purpose\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Commencez par ce que la surface doit faire<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Functional-surface-requirements-1024x572.webp\" alt=\"Functional surface requirements\" class=\"size-large wp-image-2094 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Functional-surface-requirements-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Functional-surface-requirements-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Functional-surface-requirements-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Functional-surface-requirements.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Avant de choisir l'anodisation, le sablage aux billes, le polissage, le placage ou une autre finition, identifiez l'objectif dominant de chaque surface :<\/p>\n<table style=\"width: 100%; border-collapse: collapse; font-size: 18px; line-height: 1.6em;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">Objectif de la surface<\/th>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">D\u00e9cision de finition \u00e0 revoir<\/th>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">Risque courant<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Protection contre la corrosion<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Compatibilit\u00e9 des mat\u00e9riaux, couverture du rev\u00eatement, bords, trous et environnement de service<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Le traitement prot\u00e8ge l'apparence mais pas la condition d'exposition r\u00e9elle<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Contr\u00f4le de l'usure ou du frottement<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Duret\u00e9, rugosit\u00e9, lubrification, mat\u00e9riau antagoniste et \u00e9paisseur du rev\u00eatement<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">La surface est lisse mais s'use rapidement ou modifie l'ajustement<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">\u00c9tanch\u00e9it\u00e9 ou contact avec les fluides<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Orientation de la rugosit\u00e9, ondulation, bavures, plan\u00e9it\u00e9, propret\u00e9 et compatibilit\u00e9 du traitement<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Une finition cosm\u00e9tique est sp\u00e9cifi\u00e9e sans m\u00e9thode d'acceptation fonctionnelle<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Apparence ou manipulation<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Texture, couleur, brillance, uniformit\u00e9, masquage et \u00e9chantillons de r\u00e9f\u00e9rence<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">La description \u00e9crite ne d\u00e9finit pas ce que le client acceptera<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Une pi\u00e8ce peut utiliser diff\u00e9rentes exigences de finition sur diff\u00e9rentes faces. Gardez les interfaces critiques, les zones cosm\u00e9tiques et les surfaces cach\u00e9es distinctes au lieu d'appliquer la finition la plus co\u00fbteuse partout.<\/p>\n<\/section>\n<section id=\"baseline\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">L'\u00e9tat brut d'usinage est un v\u00e9ritable choix d'ing\u00e9nierie<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/As-machined-CNC-surfaces-1024x572.webp\" alt=\"As-machined CNC surfaces\" class=\"size-large wp-image-2096 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/As-machined-CNC-surfaces-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/As-machined-CNC-surfaces-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/As-machined-CNC-surfaces-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/As-machined-CNC-surfaces.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Une surface brute d'usinage conserve la texture cr\u00e9\u00e9e par l'outil de coupe et \u00e9vite un post-traitement s\u00e9par\u00e9. Elle peut convenir aux caract\u00e9ristiques internes, aux montages, aux prototypes, aux supports non esth\u00e9tiques et aux interfaces dont la fonction est d\u00e9j\u00e0 assur\u00e9e par le processus d'usinage.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Quand une surface usin\u00e9e suffit<\/h3>\n<ul>\n<li>La surface est cach\u00e9e ou n'est pas expos\u00e9e \u00e0 un environnement corrosif.<\/li>\n<li>Les marques d'outil visibles n'affectent ni l'apparence ni la perception du client.<\/li>\n<li>La rugosit\u00e9 et l'\u00e9tat des ar\u00eates sont ad\u00e9quats pour la fonction d'assemblage ou d'\u00e9tanch\u00e9it\u00e9.<\/li>\n<li>Un rev\u00eatement ajouterait un risque ou de l'\u00e9paisseur sans b\u00e9n\u00e9fice de performance significatif.<\/li>\n<\/ul>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Si un r\u00e9sultat plus lisse est n\u00e9cessaire, sp\u00e9cifiez la surface fonctionnelle et la valeur d'acceptation plut\u00f4t que de demander la finition \u201c la plus lisse possible \u201d. Cette derni\u00e8re est difficile \u00e0 chiffrer et \u00e0 inspecter de mani\u00e8re coh\u00e9rente.<\/p>\n<\/section>\n<section id=\"mechanical\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Finitions m\u00e9caniques pour la texture et l'aspect<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Mechanical-finish-comparison-1024x572.webp\" alt=\"Mechanical finish comparison\" class=\"size-large wp-image-2095 aligncenter\" \/>\n<h3 style=\"font-size: 24px; line-height: 2em;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Mechanical-finish-comparison-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Mechanical-finish-comparison-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Mechanical-finish-comparison-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Mechanical-finish-comparison.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Sablage aux billes ou au m\u00e9dia<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Le sablage peut cr\u00e9er un aspect mat ou satin\u00e9 plus uniforme et r\u00e9duire la dominance visuelle des marques d'outil. Il peut \u00e9galement adoucir les ar\u00eates, modifier les petites caract\u00e9ristiques, affecter la rugosit\u00e9 ou laisser des r\u00e9sidus de m\u00e9dia dans les recoins. D\u00e9finissez le masquage et les surfaces prot\u00e9g\u00e9es lorsque les trous, les filetages, les port\u00e9es de roulement ou les faces d'\u00e9tanch\u00e9it\u00e9 doivent rester contr\u00f4l\u00e9s.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Brossage et texture directionnelle<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Les finitions bross\u00e9es cr\u00e9ent un aspect directionnel qui peut aider \u00e0 masquer les marques de manipulation, mais la direction, le chevauchement, les transitions d'ar\u00eates et la coh\u00e9rence esth\u00e9tique comptent. Un panneau \u00e9chantillon ou une r\u00e9f\u00e9rence approuv\u00e9e peut \u00eatre plus utile qu'un adjectif tel que \u201c premium \u201d.\u201d<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Polissage<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Le polissage \u00e9limine ou lisse la mati\u00e8re et peut am\u00e9liorer l'apparence, la nettoyabilit\u00e9 ou le comportement au contact. Il peut arrondir les ar\u00eates, modifier les dimensions locales, r\u00e9v\u00e9ler des inclusions et n\u00e9cessiter une m\u00e9thode d'inspection distincte. Pr\u00e9cisez si l'exigence est satin\u00e9e, brillante, miroir ou un niveau de rugosit\u00e9 mesur\u00e9.<\/p>\n<\/section>\n<section id=\"chemical\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Finitions chimiques et \u00e9lectrochimiques<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Chemical-finish-samples-1024x572.webp\" alt=\"Chemical finish samples\" class=\"size-large wp-image-2097 aligncenter\" \/>\n<h3 style=\"font-size: 24px; line-height: 2em;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Chemical-finish-samples-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Chemical-finish-samples-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Chemical-finish-samples-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Chemical-finish-samples.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Anodisation pour l'aluminium<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">L'anodisation peut assurer une protection contre la corrosion, une couleur, une duret\u00e9 et un aspect contr\u00f4l\u00e9 sur les alliages d'aluminium appropri\u00e9s. L'alliage, la pr\u00e9paration de surface, la couleur, le masquage et le type de traitement affectent le r\u00e9sultat. La croissance ou la p\u00e9n\u00e9tration du rev\u00eatement peut influencer les trous, les filetages, les ajustements et le contact \u00e9lectrique, de sorte que les dimensions critiques doivent \u00eatre examin\u00e9es par rapport \u00e0 l'\u00e9tat fini.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Passivation pour l'acier inoxydable<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Passivation is used to improve the corrosion behavior of suitable stainless steel surfaces after machining and cleaning. It is not an all-purpose appearance treatment, and the cleaning, surface condition, chemical environment, and acceptance requirement still need to be defined.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Black oxide and other chemical treatments<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Chemical finishes are material-specific. A treatment that works for one alloy may be ineffective or inappropriate for another. State the base material before selecting the finish, and confirm whether an oil, sealant, topcoat, or dimensional allowance is part of the specification.<\/p>\n<\/section>\n<section id=\"coating\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Rev\u00eatements, placage et contr\u00f4le dimensionnel<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Coating-dimensional-control-1024x572.webp\" alt=\"Coating dimensional control\" class=\"size-large wp-image-2093 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Coating-dimensional-control-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Coating-dimensional-control-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Coating-dimensional-control-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/08\/Coating-dimensional-control.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Plating, powder coating, paint, PVD, and other coatings can improve protection, wear, conductivity, appearance, or chemical resistance. The coating is also another manufacturing operation with its own thickness variation, edge behavior, adhesion, masking, and inspection requirements.<\/p>\n<table style=\"width: 100%; border-collapse: collapse; font-size: 18px; line-height: 1.6em;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">Question<\/th>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">Pourquoi c'est important<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Which surfaces are masked?<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Threads, bores, electrical contacts, sealing faces, and locating surfaces may not accept the same coating<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">What is the required thickness or range?<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Thickness can change fits, hole size, edge buildup, friction, and electrical behavior<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">When is the critical dimension measured?<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">The part may need machining allowance before treatment and verification after treatment<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">How is adhesion or appearance accepted?<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">A general color name does not define adhesion, gloss, texture, coverage, or acceptable variation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<section id=\"roughness\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Ra, Rz et la question de l'inspection<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Ra is a common arithmetic-average roughness parameter, while Rz and other parameters describe the surface differently. A single roughness value does not fully describe waviness, lay direction, burrs, scratches, pores, or cosmetic uniformity. The correct parameter and measurement direction depend on the function.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Write a measurable requirement<\/h3>\n<ol>\n<li>Identify the exact surface or zone that requires the finish.<\/li>\n<li>State the roughness parameter, unit, limit, and measurement direction when relevant.<\/li>\n<li>Define whether the value applies before or after coating, polishing, blasting, or passivation.<\/li>\n<li>Separate roughness from visual appearance, color, scratches, tool marks, and edge condition.<\/li>\n<li>Agree on the instrument, reference area, and sample or report expectation.<\/li>\n<\/ol>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Surface finish and dimensional control are connected. Review the <a href=\"https:\/\/www.jccncmachining.com\/fr\/blog\/tolerances-dusinage-cnc\/\">Guide des tol\u00e9rances CNC<\/a> when a finish may change a critical fit or inspection result.<\/p>\n<\/section>\n<section id=\"material\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">La compatibilit\u00e9 des mat\u00e9riaux passe en premier<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">The base material affects which finishes are available, how uniform the result will be, what color is possible, and how the surface behaves in service. Alloy, temper, hardness, reinforcement, porosity, and prior machining condition can all matter.<\/p>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Utilisez le <a href=\"https:\/\/www.jccncmachining.com\/fr\/blog\/materiaux-dusinage-cnc\/\">guide de s\u00e9lection des mat\u00e9riaux CNC<\/a> to connect finish decisions to the material\u2019s environment, wear, heat, electrical, and dimensional requirements. Do not specify a finish only because it is common on another alloy.<\/p>\n<\/section>\n<section id=\"specify\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Comment sp\u00e9cifier une finition sur un dessin<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">A useful finish callout answers four questions: what process, on which surfaces, to what result, and how will it be accepted?<\/p>\n<ul>\n<li>Name the base material and condition.<\/li>\n<li>Name the treatment or mechanical finish and the required class, type, color, texture, or roughness.<\/li>\n<li>Mark protected, masked, cosmetic, sealing, electrical, and fit-critical surfaces.<\/li>\n<li>State coating thickness, allowance, dimensional condition, or post-finish measurement where needed.<\/li>\n<li>Define samples, visual limits, roughness measurement, adhesion, cleanliness, and documentation.<\/li>\n<li>Identify any approved supplier, customer specification, or substitute-approval process.<\/li>\n<\/ul>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">A finish note should be specific enough for an estimator to quote and an inspector to accept. \u201cNice cosmetic finish\u201d is neither.<\/p>\n<\/section>\n<section id=\"cost\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Finition, co\u00fbt et risque de production<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Surface treatment affects more than the external processing charge. It can change masking, packaging, inspection, rework, lead time, yield, and the dimensional strategy used during machining. Over-specifying every surface can add cost without improving the product; under-specifying a functional surface can create field failure or rework.<\/p>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">When comparing options, consider appearance, corrosion, wear, friction, sealing, electrical behavior, cleanability, dimensional effect, material compatibility, quantity, documentation, and total route cost. The goal is a finish that solves the actual service problem.<\/p>\n<\/section>\n<section id=\"faq\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">FAQ sur les finitions de surface CNC<\/h2>\n<h3 style=\"font-size: 24px; line-height: 2em;\">What is the best surface finish for a CNC part?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">There is no universal best finish. Select it from the surface\u2019s function, material, environment, appearance, tolerance, quantity, inspection method, and budget. An as-machined surface may be correct for one area while another needs a coating or polished condition.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Does anodizing change CNC part dimensions?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">It can. The treatment may change the condition of edges, holes, threads, fits, and electrical contacts. Critical dimensions should identify whether they apply before or after treatment and which surfaces are masked.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">What is the difference between surface finish and surface roughness?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Surface finish is a broader description of texture, appearance, treatment, and condition. Surface roughness is a measured characteristic such as Ra or Rz. A roughness number alone may not define scratches, waviness, lay, burrs, color, or visual acceptance.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Is bead blasting suitable for every CNC material?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">No. The media, pressure, base material, geometry, masking, and cleanliness requirement affect the result. Confirm compatibility and protect critical surfaces, threads, bores, and cosmetic zones when needed.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">How can I reduce surface finishing cost?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Apply the finish only to surfaces that need it, choose a material-compatible process, define measurable acceptance, avoid unnecessary masking, and coordinate the finish with tolerances and inspection. A supplier DFM review can identify a simpler finish that still meets function.<\/p>\n<\/section>\n<footer>\n<div class=\"cta-box\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Need help selecting a CNC surface finish?<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Share the material, service environment, cosmetic target, critical surfaces, tolerance, quantity, and inspection requirement. JUCHENG CNC Machining can review finish compatibility and process risk before quoting.<\/p>\n<\/div>\n<\/footer>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>A CNC part is not finished simply because it has come off the machine. The surface may need to resist corrosion, reduce friction, support sealing, accept a coating, provide a specific appearance, or preserve a critical dimension. The right surface finish depends on material, function, environment, geometry, tolerance, quantity, and budget. Choosing by appearance alone [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2098,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[66,67,64,65],"class_list":["post-1985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-anodizing","tag-cnc-coatings","tag-cnc-surface-finishes","tag-surface-roughness"],"_links":{"self":[{"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/posts\/1985","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/comments?post=1985"}],"version-history":[{"count":8,"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/posts\/1985\/revisions"}],"predecessor-version":[{"id":2099,"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/posts\/1985\/revisions\/2099"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/media\/2098"}],"wp:attachment":[{"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/media?parent=1985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/categories?post=1985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jccncmachining.com\/fr\/wp-json\/wp\/v2\/tags?post=1985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}