{"id":894,"date":"2026-10-17T14:45:51","date_gmt":"2026-10-17T06:45:51","guid":{"rendered":"https:\/\/www.ypmfg.com\/2026\/10\/17\/parts-machining-what-to-check\/"},"modified":"2026-10-17T14:45:51","modified_gmt":"2026-10-17T06:45:51","slug":"parts-machining-what-to-check","status":"publish","type":"post","link":"https:\/\/www.ypmfg.com\/fr\/2026\/10\/17\/parts-machining-what-to-check\/","title":{"rendered":"Parts Machining: What to Check"},"content":{"rendered":"<div style=\"margin: 0 auto;padding: 20px;font-family: -apple-system, BlinkMacSystemFont, &#039;Segoe UI&#039;, Roboto, &#039;Helvetica Neue&#039;, Arial, sans-serif\">\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Parts machining quality is determined by three variables: tolerance specification, material grade, and the chosen cutting process. Most production failures trace back to ambiguous drawings or a material grade that does not match the application. Before requesting a quote, confirm your tolerance class, material spec number, and whether <strong style=\"font-weight: 600;color: #b32050\">Fraisage CNC<\/strong>, <strong style=\"font-weight: 600;color: #b32050\">Tournage CNC<\/strong>, or a combined approach fits the part geometry. YPMFG reviews incoming specifications for manufacturability before committing to production, which surfaces gaps early in the sourcing process.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong>Buyers and engineers often discover problems after the first batch arrives: wrong hardness, out-of-tolerance features, or a surface finish that fails inspection. The checks below cover the decisions that prevent those outcomes.<\/strong><\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Tolerances and Feature Definition<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Tolerance class is the single biggest driver of both cost and cycle time. A \u00b10.1 mm tolerance on a standard milled feature is routine. The same feature at \u00b10.01 mm may require <strong style=\"font-weight: 600;color: #b32050\">Rectification CNC<\/strong> or a secondary operation, which changes tooling, fixturing, and inspection time.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">When you send a drawing, verify three things:<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Are critical tolerances called out explicitly, or left to general notes?<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Does the feature depth-to-diameter ratio exceed 4:1? If so, standard milling may not hold tolerance without a multi-setup or <strong style=\"font-weight: 600;color: #b32050\">Tournage CNC<\/strong> approach.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Are Datum A, B, and C defined so the shop measures the same features you care about?<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">A missing datum reference is one of the most common causes of a rework conversation six weeks into a project.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Material Selection and Grade Verification<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><img decoding=\"async\" src=\"https:\/\/www.ypmfg.com\/wp-content\/themes\/mb\/images_nengli\/rd-cnc-machine-facility-optimized.png\" alt=\"parts machining_parts machining_parts machining\" style=\"width: 100%;max-width: 960px;height: auto;display: block;margin: 1.8em auto;border-radius: 0px\"><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">&#8220;Stainless steel&#8221; is not a material specification. 303, 316L, 17-4 PH, and duplex 2205 all respond differently to cutting forces, heat input, and post-machining treatment. Confirm the exact grade, condition (annealed, H900, etc.), and whether the part needs a post-machining stress-relief cycle.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">For aluminum, 6061-T6 and 7075-T73 have distinct strength and corrosion profiles. Choosing the wrong series can save money on the raw bar but cost you a redesign later.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">YPMFG can review your BOM against available mill certifications and flag substitutions that may affect <strong style=\"font-weight: 600;color: #b32050\">tra\u00e7abilit\u00e9 des mat\u00e9riaux<\/strong> or downstream heat-treat schedules.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Process Fit and Finishing<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Not every part is best made on one machine. A hub with internal splines, an external bore, and a threaded port typically calls for:<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Fraisage CNC<\/strong> for flat and prismatic features<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Tournage CNC<\/strong> for the bore and outer diameter<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Manual or vibratory finishing for deburring and surface texture<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Finishing calls matter. Anodize thickness, passivation grade, and plating adhesion all depend on the base material and the machining marks left on the surface. Specify the finish standard, not just the color.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">A Practical Pre-Order Checklist<\/h2>\n<table style=\"width: 100%;border-collapse: collapse;margin: 1.6em 0;border-radius: 10px 10px 0 0;overflow: hidden\">\n<tr>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">Check Item<\/th>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">Pourquoi est-ce important ?<\/th>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">Risque typique en cas de non-respect<\/th>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Tolerance class per feature<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Drives machine selection and inspection method<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Rework, scrap, schedule slip<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Material grade + temper condition<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Affects cutting speed, hardness, corrosion resistance<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Functional failure in service<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Datum references on drawing<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Ensures the shop measures what you measure<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Out-of-tolerance acceptance<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Surface finish \/ Ra value<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Determines secondary operations and cost<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Extra cost, missed spec<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Thread call-out (pitch, depth, tolerance)<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Prevents wrong tap or die selection<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Assembly rejection<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Quantity and revision number<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Locks tooling and setup cost<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Version confusion, wasted fixtures<\/td>\n<\/tr>\n<\/table>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><img decoding=\"async\" src=\"https:\/\/www.ypmfg.com\/wp-content\/themes\/mb\/images_nengli\/cnc-icon-6.webp\" alt=\"parts machining_parts machining_parts machining\" style=\"width: 100%;max-width: 960px;height: auto;display: block;margin: 1.8em auto;border-radius: 0px\"><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Keep this list beside your drawing before sending it to any shop. It takes ten minutes to complete and saves weeks of back-and-forth.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Common Mistakes That Inflate Cost<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Combining five different material grades into one part number. Each grade requires separate bar stock, separate traceability, and sometimes separate tooling.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Requesting &#8220;as-machined&#8221; surface finish on a feature that will later be plated. Machining marks under plating cause blistering and rejection.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Specifying a tolerance tighter than the function requires. \u00b10.02 mm on a non-mating boss costs more than the functional gain justifies.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Skipping a design-for-manufacturability review. A short engineering check on your CAD file can eliminate a lengthy rework cycle per part.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Questions Buyers Often Ask About Parts Machining<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">What file formats should I send?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Most CNC shops accept STEP, IGES,and SolidWorks native files. PDF drawings help for reference but cannot drive programming. Confirm your shop can open your format before uploading.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">How do I decide between 5-axis and 3-axis milling?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">If your part has features on more than three orthogonal faces that cannot be reached by fixturing and flipping, a 5-axis <strong style=\"font-weight: 600;color: #b32050\">Fraisage CNC<\/strong> setup reduces setups and improves positional accuracy. For simple prismatic parts, 3-axis is sufficient and more economical.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">What lead time is realistic for a first article?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong>A first-article job with new tooling typically runs two to four weeks, depending on feature complexity and material availability. Repeat orders from the same fixture drop to a matter of days.<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Do I need post-machining stress relief?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">For high-strength steel or titanium parts in critical applications, a post-machining stress-relief cycle is often recommended. Ask your materials engineer whether the spec requires it before the part ships.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">How should I handle tight internal features?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Drill-then-bore is standard. For deep holes exceeding six times the diameter, consider machining from the opposite side or a gun-drill process. Confirm the shop&#8217;s maximum reachable depth.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Prendre une meilleure d\u00e9cision \u00e0 long terme<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">The parts machining decision is not just about landing a unit price. It is about locking in a repeatable, inspectable, and traceable process before the first chip is cut. Send your drawing, BOM, and quantity range to YPMFG for a manufacturability review. The team will flag tolerance conflicts, suggest process alternatives, and return a quoted timeline so you can compare options before committing to a production run.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Parts machining quality is determined by three variables: tolerance specification<\/p>","protected":false},"author":1,"featured_media":895,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[381,732,403,611,654],"class_list":["post-894","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cnc-milling","tag-manufacturability-review","tag-material-grade","tag-parts-machining","tag-tolerance-specification"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Parts Machining: What to Check<\/title>\n<meta name=\"robots\" content=\"index, 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