{"id":166252,"date":"2023-03-16T17:25:32","date_gmt":"2023-03-16T09:25:32","guid":{"rendered":"https:\/\/facfox.com\/docs\/?post_type=kb&#038;p=166252"},"modified":"2023-03-16T17:25:58","modified_gmt":"2023-03-16T09:25:58","slug":"surface-finishing-for-cnc-milling-a-complete-guide","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/surface-finishing-for-cnc-milling-a-complete-guide","title":{"rendered":"Surface Finishing for CNC Milling: A Complete Guide"},"content":{"rendered":"<p><span style=\"color: #333333;\">Surface finishing is an important aspect of CNC machining that can enhance the quality and performance of your parts. In this post, we will introduce some of the types and benefits of surface finishing for CNC milling.<\/span><\/p>\n<figure style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2023\/03\/16\/16d96bbc3e08ccec.jpg\" alt=\"Visible minor tool marks of the as-machined aluminum part. Source: FacFox\" width=\"1200\" height=\"900\" \/><figcaption class=\"wp-caption-text\">Visible minor tool marks of the as-machined aluminum part. Source: FacFox<\/figcaption><\/figure>\n<h3><span style=\"color: #333333;\">What is surface finishing?<\/span><\/h3>\n<p><span style=\"color: #333333;\">Surface finishing is the process of applying a coating, treatment, or texture to the surface of a part after it has been machined. Surface finishing can improve various properties of a part, such as:<\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\">Appearance: Surface finishing can make a part look more attractive, professional, or customized by adding color, gloss, or patterns.\u00a0<\/span><\/li>\n<li><span style=\"color: #333333;\">Durability: Surface finishing can increase the resistance of a part to corrosion, wear, abrasion, impact, or fatigue by creating a protective layer or reducing friction.\u00a0<\/span><\/li>\n<li><span style=\"color: #333333;\">Functionality: Surface finishing can modify the electrical conductivity, thermal conductivity, magnetic properties, or chemical compatibility of a part by changing its surface composition or structure.\u00a0<\/span><\/li>\n<\/ul>\n<figure style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2023\/03\/16\/76ca4cf39603ba73.jpg\" alt=\"Brushed aluminum part has\u00a0straight lines\u00a0that are parallel to the direction of the brush movement. The surface is\u00a0smooth and shiny, but not reflective or glossy. Source: FacFox\" width=\"1200\" height=\"900\" \/><figcaption class=\"wp-caption-text\">The brushed aluminum part has straight lines that are parallel to the direction of the brush movement. The surface is smooth and shiny, but not reflective or glossy. Source: FacFox<\/figcaption><\/figure>\n<h3><span style=\"color: #333333;\">What are common types of surface finishing for CNC milling?<\/span><\/h3>\n<p><span style=\"color: #333333;\">There are many types of surface finishing for CNC milling that can be classified into three categories:<\/span><\/p>\n<h4><span style=\"color: #333333;\">Primary finishes<\/span><\/h4>\n<p><span style=\"color: #333333;\">These are the finishes that result from the machining process itself. They depend on factors such as tool geometry, feed rate, spindle speed, and cutting fluid. Primary finishes affect the roughness and accuracy of a part\u2019s surface.\u00a0<\/span><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-15-group\">Examples include: <\/a><\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-15-group\">As-machined finish<\/a>, <a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-17-group\">which leaves visible tool marks<\/a><br \/>\n<\/span><\/li>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-17-group\">Smooth finish<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-19-group\">, which removes most tool marks<\/a><\/span><\/li>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-19-group\">Mirror finish<\/a>, which creates a highly reflective surface<\/span><\/li>\n<\/ul>\n<figure style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2023\/03\/16\/19ae179a37e5eec9.jpg\" alt=\"The smooth and shiny surface of a mirror-polished aluminum wheel. Source: Miami Star\" width=\"1200\" height=\"900\" \/><figcaption class=\"wp-caption-text\">The smooth and shiny surface of a mirror-polished aluminum wheel. Source: Miami Star<\/figcaption><\/figure>\n<h4><span style=\"color: #333333;\">Secondary finishes<\/span><\/h4>\n<p><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.fastradius.com\/resources\/cnc-finishes\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-22-group\">These are the finishes that are applied after machining by using additional processes such as blasting<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-24-group\">, sanding<\/a>, <a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.fastradius.com\/resources\/cnc-finishes\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-28-group\">polishing<\/a>, <a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.cnclathing.com\/guide\/cnc-machining-surface-finishes-introductions-cnc-surface-roughness-texture-topology-finishing\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-30-group\">lapping<\/a>, etc. Secondary finishes can further smooth out or roughen up a part\u2019s surface depending on the desired effect.\u00a0<\/span><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.fastradius.com\/resources\/cnc-finishes\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-32-group\">Examples include: <\/a><\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.fastradius.com\/resources\/cnc-finishes\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-32-group\">Bead blasting<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.fastradius.com\/resources\/cnc-finishes\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-34-group\">, which creates a matte texture<\/a><\/span><\/li>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.fastradius.com\/resources\/cnc-finishes\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-34-group\">Wet sanding<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.americanmicroinc.com\/resources\/surface-finishes-cnc-machining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-36-group\">, which removes scratches and burrs<\/a><\/span><\/li>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.americanmicroinc.com\/resources\/surface-finishes-cnc-machining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-36-group\">Fire polishing<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.americanmicroinc.com\/resources\/surface-finishes-cnc-machining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-40-group\">, which melts away irregularities<\/a><\/span><\/li>\n<li><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.americanmicroinc.com\/resources\/surface-finishes-cnc-machining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-40-group\">Vapor polishing<\/a>, which produces a clear and glossy surface<\/li>\n<\/ul>\n<figure style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2023\/03\/16\/b7b245c947cd7b3e.jpg\" alt=\"The surface of sand-blasted part has a matte finish with a dull, satin, or rough texture, depending on the size and type of beads used. Source: Cerakote UK\" width=\"1200\" height=\"900\" \/><figcaption class=\"wp-caption-text\">The surface of sand-blasted part has a matte finish with a dull, satin, or rough texture, depending on the size and type of beads used. Source: Cerakote UK<\/figcaption><\/figure>\n<h4><span style=\"color: #333333;\">Tertiary finishes<\/span><\/h4>\n<p><span style=\"color: #333333;\">These are the finishes that involve chemical or physical treatments that alter the surface layer of a part. Tertiary finishes can provide various benefits such as coloration, protection, lubrication, etc.\u00a0<\/span><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-45-group\">Examples include: <\/a><\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-45-group\">Anodizing<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-49-group\">, which creates an oxide layer that adds color and corrosion resistance<\/a><\/span><\/li>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-49-group\">Plating<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-53-group\">, which deposits a metal coating that improves wear resistance and electrical conductivity<\/a><\/span><\/li>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-53-group\">Painting<\/a><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-55-group\">, which applies a liquid coating that enhances appearance and durability; <\/a><\/span><\/li>\n<li><span style=\"color: #333333;\"><a class=\"tooltip-target\" style=\"color: #333333;\" href=\"https:\/\/www.hubs.com\/knowledge-base\/surface-finishes-cnc-machinining\/\" target=\"_blank\" rel=\"noopener\" data-citationid=\"94ccfee8-8615-d589-7b18-b83e4fc1833a-55-group\">Powder coating<\/a>, which applies a dry powder coating that forms a hard and uniform layer.<\/span><\/li>\n<\/ul>\n<p><iframe title=\"The Different Surface Finishes for CNC Machining (compared)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/gMaYpWUQI9U?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3><span style=\"color: #333333;\">How to choose the right type of surface finishing for CNC milling?<\/span><\/h3>\n<p><span style=\"color: #333333;\">The choice of surface finishing for CNC milling depends on several factors such as:<\/span><\/p>\n<h4><span style=\"color: #333333;\">Material<\/span><\/h4>\n<p><span style=\"color: #333333;\">Different materials have different characteristics and compatibility with different types of finishes. For example,<\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\">Metals can be anodized (aluminum), plated (steel), painted (iron), powder-coated (zinc), etc.\u00a0<\/span><\/li>\n<li><span style=\"color: #333333;\">Plastics can be polished (acrylic), vapor polished (polycarbonate), painted (ABS), powder-coated (nylon), etc.\u00a0<\/span><\/li>\n<li><span style=\"color: #333333;\">Wood can be sanded (pine), stained (oak), varnished (maple), lacquered (walnut), etc.\u00a0<\/span><\/li>\n<\/ul>\n<figure style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2023\/03\/16\/e241eee71f24e6fb.jpg\" alt=\"Powder coating adds a wear- and corrosion-resistant finish to the surface of the parts. It has higher impact resistance compared to anodizing, comes with a large range of colors, and can be applied to any metal. Source: FacFox\" width=\"1200\" height=\"900\" \/><figcaption class=\"wp-caption-text\">Powder coating gives a wear-resistant and corrosion-resistant finish to the surface. It has higher impact resistance compared to anodizing, offering a large range of colors, and is appliable with any metal. Source: FacFox<\/figcaption><\/figure>\n<h4><span style=\"color: #333333;\">Design<\/span><\/h4>\n<p><span style=\"color: #333333;\">Different designs have different requirements and constraints for different types of finishes. For example:<\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\">Complex shapes may need more flexible or conformal finishes such as painting or powder coating.\u00a0<\/span><\/li>\n<li><span style=\"color: #333333;\">Fine details may need more precise or delicate finishes such as polishing or lapping.\u00a0<\/span><\/li>\n<li><span style=\"color: #333333;\">Large surfaces may need more economical or efficient finishes such as blasting or sanding.\u00a0<\/span><\/li>\n<\/ul>\n<figure style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2023\/03\/16\/608d5c589c1aa346.jpg\" alt=\"Anodizing is only available for aluminum and titanium. Type II adds a corrosion-resistant, ceramic layer to the surface, while Type III (hard coat) adds wear- and corrosion-resistant properties. It has a limited range of color selections. Source: FacFox\" width=\"1200\" height=\"900\" \/><figcaption class=\"wp-caption-text\">Anodizing is only available for aluminum and titanium. Type II adds a corrosion-resistant, ceramic layer to the surface, while Type III (hard coat) adds wear- and corrosion-resistant properties. It has a limited range of color selections. Source: FacFox<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h4><span style=\"color: #333333;\">Application<\/span><\/h4>\n<p><span style=\"color: #333333;\">Different applications have different expectations and specifications for different types of finishes. For example:<\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\">Aesthetic parts may need more attractive or customizable finishes such as anodizing or painting.<\/span><\/li>\n<li><span style=\"color: #333333;\">Functional parts may need more durable or performance-enhancing finishes such as plating or powder coating.<\/span><\/li>\n<li><span style=\"color: #333333;\">Medical parts may need more biocompatible or sterilizable finishes such as polishing.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #333333;\">These are some general guidelines for choosing the right type of surface finishing for CNC milling. However, the final decision should also consider other factors such as cost, availability, and environmental impact.<\/span><\/p>\n<figure style=\"width: 1199px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2023\/03\/16\/6d5cd17def272aaa.jpg\" alt=\"The surface has a shiny and metallic appearance that is also attractive and elegant. And it has a hard and smooth texture that is resistant to wear, abrasion, and corrosion. Source: FacFox\" width=\"1199\" height=\"900\" \/><figcaption class=\"wp-caption-text\">The surface has a shiny and metallic appearance that is also attractive and elegant. And it has a hard and smooth texture that is resistant to wear, abrasion, and corrosion. Source: FacFox<\/figcaption><\/figure>\n<h3><span style=\"color: #333333;\">Conclusion<\/span><\/h3>\n<p><span style=\"color: #333333;\">Surface finishing is an essential step in CNC machining that can improve your parts\u2019 quality and performance in various ways. <\/span>If you need high-quality CNC milling parts, then FacFox is your best choice.<\/p>\n<p>FacFox not only offers accurate and fast CNC milling service, but also provides various surface finishing services to give your parts the ideal appearance and performance. Whether you need brushing, bead blasting, chrome plating or any other surface treatment, FacFox can meet your needs.<\/p>\n<p>FacFox has a professional team of engineers to provide you with optimized design and technical support. FacFox also offers an online quotation and order tracking system, so you can always know the progress of your project. Don\u2019t hesitate, <a href=\"info@facfox.com\">contact FacFox now<\/a> and let us create perfect CNC milling parts for you!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Surface finishing is an important aspect of CNC machining that can enhance the quality and performance of your parts. In this post, we will introduce some of the types and benefits of surface finishing for CNC milling. What is surface finishing? Surface finishing is the process of applying a coating, treatment, or texture to the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":166254,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[45],"kbtag":[507,144,265,443,152,400,870,294],"class_list":["post-166252","kb","type-kb","status-publish","has-post-thumbnail","hentry","kbtopic-tech","kbtag-anodizing","kbtag-cnc","kbtag-cnc-milling","kbtag-finishing","kbtag-plating","kbtag-polishing","kbtag-powder-coating","kbtag-surface"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Surface Finishing for CNC Milling: A Complete Guide<\/title>\n<meta name=\"description\" content=\"Learn about the types and benefits of surface finishing for CNC milling, and choose the right one for your material, design, and application.\" \/>\n<meta name=\"robots\" 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