{"id":1975,"date":"2026-09-04T16:27:43","date_gmt":"2026-09-04T08:27:43","guid":{"rendered":"https:\/\/www.jccncmachining.com\/?p=1975"},"modified":"2026-09-01T15:24:06","modified_gmt":"2026-09-01T07:24:06","slug":"cnc-machining-tolerances","status":"publish","type":"post","link":"https:\/\/www.jccncmachining.com\/es\/blog\/cnc-machining-tolerances\/","title":{"rendered":"Why CNC Parts Miss Fit\u2014and How to Set Better Tolerances"},"content":{"rendered":"<article class=\"blog-post\">\n<p class=\"lead\" style=\"font-size: 20px; line-height: 2em; text-align: left;\"><strong>CNC machining tolerances<\/strong> are the controlled limits around a drawing\u2019s nominal dimensions. They determine whether a shaft fits a bore, whether a housing seals, whether an assembly aligns, and how much process and inspection discipline a part requires. The right tolerance is not the tightest value a machine might reach. It is the loosest limit that protects the function, supported by a stable setup, suitable material strategy, and a defined measurement method.<\/p>\n<nav class=\"table-of-contents\" aria-label=\"Table of Contents\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">CNC Tolerance Planning at a Glance<\/h2>\n<ul>\n<li><a href=\"#function\">Tolerance Starts with Function<\/a><\/li>\n<li><a href=\"#hierarchy\">A Practical Tolerance Hierarchy<\/a><\/li>\n<li><a href=\"#general\">When General Tolerances Are Enough<\/a><\/li>\n<li><a href=\"#features\">Feature-Level Tolerances That Deserve Attention<\/a><\/li>\n<li><a href=\"#gd-t\">GD&amp;T, Fits, and Datum Strategy<\/a><\/li>\n<li><a href=\"#stability\">What Pushes a Tolerance Out of Control?<\/a><\/li>\n<li><a href=\"#inspection\">Material, Finish, and Inspection Effects<\/a><\/li>\n<li><a href=\"#workflow\">A Drawing Review Workflow<\/a><\/li>\n<li><a href=\"#faq\">CNC Machining Tolerances FAQs<\/a><\/li>\n<\/ul>\n<\/nav>\n<section id=\"function\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Tolerance Starts with Function<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Functional-tolerance-features-1024x572.webp\" alt=\"Functional tolerance features\" class=\"size-large wp-image-2058 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Functional-tolerance-features-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Functional-tolerance-features-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Functional-tolerance-features-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Functional-tolerance-features.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>A tolerance is a functional decision expressed on a drawing. It defines how much variation a feature can accept while the part still performs as intended. A bracket that only locates a cable may tolerate more variation than a bearing seat, sealing face, or precision mating interface. Treating every dimension as equally critical usually increases cost without improving the product.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Ask what the feature must do<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Before selecting a numerical limit, describe the feature\u2019s job. Does it locate another part, carry a load, control a gap, create a seal, guide motion, transfer heat, or define an appearance boundary? The answer determines whether the priority is size, position, orientation, form, surface condition, or a combination of controls.<\/p>\n<ul>\n<li><strong>Location:<\/strong> holes and datums may need controlled position so fasteners, pins, or interfaces align.<\/li>\n<li><strong>Size:<\/strong> shafts, bores, slots, and pockets may need limits that support a clearance, transition, or interference fit.<\/li>\n<li><strong>Form:<\/strong> flatness, roundness, straightness, or cylindricity may matter even when the overall size is acceptable.<\/li>\n<li><strong>Orientation:<\/strong> parallelism, perpendicularity, and angular control can determine whether an assembly seats correctly.<\/li>\n<li><strong>Surface:<\/strong> roughness, burr condition, coating thickness, and cosmetic variation may affect sealing, wear, or appearance.<\/li>\n<\/ul>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">For a broader view of how drawing requirements become a finished part, start with the site\u2019s <a href=\"https:\/\/www.jccncmachining.com\/es\/\">CNC machining overview<\/a>. Tolerance planning should be part of the manufacturing conversation before a quote is released.<\/p>\n<\/section>\n<section id=\"hierarchy\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">A Practical Tolerance Hierarchy<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Tolerance-priority-hierarchy-1024x572.webp\" alt=\"Tolerance priority hierarchy\" class=\"size-large wp-image-2060 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Tolerance-priority-hierarchy-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Tolerance-priority-hierarchy-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Tolerance-priority-hierarchy-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Tolerance-priority-hierarchy.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>A useful drawing separates ordinary dimensions from features that control assembly or performance. This hierarchy gives the supplier a clear signal about where to spend setup time, finishing effort, and inspection resources.<\/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;\">Drawing priority<\/th>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">Typical purpose<\/th>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">What the supplier needs to know<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\"><strong>General features<\/strong><\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Overall shape, non-critical holes, clearance features, and support geometry<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">The applicable general tolerance note and units<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\"><strong>Controlled features<\/strong><\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Interfaces, locating features, threaded elements, and functional gaps<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">The individual limit, fit intent, datum reference, and finish condition<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\"><strong>Critical characteristics<\/strong><\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Features that affect safety, sealing, motion, pressure, or regulatory performance<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">The acceptance method, inspection report expectation, and change-control requirement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Why a single blanket tolerance can create confusion<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">A blanket note may be appropriate for many non-critical dimensions, but it cannot explain the fit of every bore, the position of every hole pattern, or the flatness of every sealing surface. If a feature is important enough to affect assembly, identify it directly. This reduces interpretation differences between design, manufacturing, and inspection.<\/p>\n<\/section>\n<section id=\"general\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">When General Tolerances Are Enough<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">General tolerances work well when a dimension has enough functional margin and does not interact with a precision interface. They can simplify drawings, reduce unnecessary inspection, and help a supplier quote the part consistently. The drawing still needs to state which general standard or company rule applies; \u201cmachine to standard\u201d is not a complete requirement.<\/p>\n<ul>\n<li>Use the general note for dimensions that do not determine fit, sealing, alignment, or controlled movement.<\/li>\n<li>Use individual callouts for bearing seats, mating diameters, locating pins, sealing faces, and critical hole patterns.<\/li>\n<li>Keep units and decimal conventions consistent across the drawing and model.<\/li>\n<li>Do not use a tight general tolerance to compensate for an unclear functional requirement.<\/li>\n<\/ul>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">The goal is not to make every dimension \u201cprecision.\u201d The goal is to make the critical dimensions visible and leave the remaining geometry manufacturable. This distinction is especially important when a project moves from a prototype to a repeat production run.<\/p>\n<\/section>\n<section id=\"features\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Feature-Level Tolerances That Deserve Attention<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Critical-machined-features-1024x572.webp\" alt=\"Critical machined features\" class=\"size-large wp-image-2062 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Critical-machined-features-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Critical-machined-features-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Critical-machined-features-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Critical-machined-features.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Different feature types fail in different ways. A supplier needs more than a target number; the complete requirement should make clear how the feature functions and how it will be verified.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Holes, bores, and threads<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">For a hole, size is only one part of the requirement. Position, perpendicularity, depth, entry condition, burr control, and the fit of the mating component may matter just as much. A thread callout should identify the thread form and size, depth or through condition, and any requirement for a controlled fit or inspection gauge.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Mating diameters and fits<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Shaft-and-bore relationships should be specified as a fit system or as coordinated limits, not as two unrelated dimensions. Consider temperature, coating or plating thickness, lubrication, assembly method, and whether the joint must be removable. A fit that works at room temperature may behave differently in service.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Thin walls, deep pockets, and large flat surfaces<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Thin sections can deflect during cutting or inspection. Deep pockets can magnify tool deflection and corner-radius limitations. Large flat surfaces can respond to residual stress, heat, or the order in which material is removed. These features need a tolerance strategy that considers geometry and process sequence, not just the nominal size.<\/p>\n<\/section>\n<section id=\"gd-t\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">GD&amp;T, Fits, and Datum Strategy<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/GDT-datum-inspection-1024x572.webp\" alt=\"GD&amp;T datum inspection\" class=\"size-large wp-image-2059 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/GDT-datum-inspection-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/GDT-datum-inspection-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/GDT-datum-inspection-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/GDT-datum-inspection.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Geometric dimensioning and tolerancing can communicate design intent more accurately than a collection of plus-and-minus dimensions. It separates size from location, orientation, and form, so the supplier and inspector can evaluate the feature in the same reference frame.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Build the datum structure around assembly<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">The primary datum should represent how the part is located in the assembly or inspection setup. Secondary and tertiary datums should constrain the remaining degrees of freedom in a way that reflects the real interface. If the drawing datum scheme does not resemble the way the part is assembled, a feature may pass one measurement method and still fail at assembly.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Do not stack controls without a reason<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Size, position, profile, flatness, and perpendicularity can interact. Applying all of them tightly may over-constrain the part or create inspection disputes. Select the control that best describes the failure mode, then define the acceptance condition clearly. If the functional requirement is unclear, a design-for-manufacturing review can often simplify the callout.<\/p>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">For tolerance-critical work, link the drawing requirement to a defined <a href=\"https:\/\/www.jccncmachining.com\/es\/about\/quality\/\">quality and inspection approach<\/a>. The measurement method should be decided before production, not after a dimension is found outside the limit.<\/p>\n<\/section>\n<section id=\"stability\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">What Pushes a Tolerance Out of Control?<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">A programmed coordinate is not the same as a stable finished dimension. The result is influenced by the complete process chain, including:<\/p>\n<ol>\n<li><strong>Machine condition and thermal state:<\/strong> temperature changes can shift the relationship between the tool, workpiece, and probing or measurement reference.<\/li>\n<li><strong>Tool wear and deflection:<\/strong> cutting force, tool length, reach, and wear can affect size and form, especially on hard materials or deep features.<\/li>\n<li><strong>Workholding:<\/strong> clamping can distort flexible parts, while poor location or insufficient support can allow movement during cutting.<\/li>\n<li><strong>Material behavior:<\/strong> residual stress, hardness variation, moisture, and thermal expansion can change the part during or after machining.<\/li>\n<li><strong>Process sequence:<\/strong> roughing, stress relief, finishing, deburring, heat treatment, and coating can all alter the final condition.<\/li>\n<li><strong>Inspection method:<\/strong> instrument resolution, calibration, temperature, fixturing, datum alignment, and operator method affect the reported result.<\/li>\n<\/ol>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">This is why a supplier should review the full drawing package instead of quoting a tolerance number in isolation. The site\u2019s <a href=\"https:\/\/www.jccncmachining.com\/es\/capabilities\/\">CNC capabilities overview<\/a> can provide process context, but the drawing, material, quantity, and inspection requirement determine what should be planned for a specific part.<\/p>\n<\/section>\n<section id=\"inspection\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Material, Finish, and Inspection Effects<\/h2>\n<p><img decoding=\"async\" width=\"1024\" height=\"572\" loading=\"lazy\" src=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Finish-tolerance-inspection-1024x572.webp\" alt=\"Finish tolerance inspection\" class=\"size-large wp-image-2057 aligncenter\" \/>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\" srcset=\"https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Finish-tolerance-inspection-1024x572.webp 1024w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Finish-tolerance-inspection-300x167.webp 300w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Finish-tolerance-inspection-768x429.webp 768w, https:\/\/www.jccncmachining.com\/wp-content\/uploads\/2026\/09\/Finish-tolerance-inspection.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>Tolerance decisions should survive the steps that happen after rough cutting. Material and finishing choices can change the final size, datum condition, surface friction, and measurement result.<\/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;\">Condition<\/th>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">Potential effect<\/th>\n<th style=\"border: 1px solid #d9e2ec; padding: 10px;\">Planning response<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Hard or difficult-to-machine material<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Higher cutting force, tool wear, heat, and longer finishing cycles<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Review tool access, workholding, sequencing, and verification before promising a limit<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Plastic or flexible material<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Deflection, moisture response, creep, or size change after unclamping<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Define support, conditioning, measurement timing, and functional allowance<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Anodizing, plating, coating, or passivation<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Added thickness, edge build-up, masking variation, or altered surface friction<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Identify post-finish critical dimensions and whether they are measured before or after finishing<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Tight inspection requirement<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">More measurement time and greater sensitivity to datum, temperature, and method<\/td>\n<td style=\"border: 1px solid #d9e2ec; padding: 10px;\">Define the report, sampling plan, equipment, and acceptance reference in advance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">A tolerance is only meaningful when the inspection method can resolve it and the measurement setup represents the part\u2019s function. If the part is temperature-sensitive, flexible, or coated, include those conditions in the quality plan rather than treating them as informal shop details.<\/p>\n<\/section>\n<section id=\"workflow\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">A Drawing Review Workflow<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Use this sequence before requesting a quote or releasing a revision:<\/p>\n<ol>\n<li><strong>Mark functional interfaces:<\/strong> identify fits, seals, locating features, load paths, and cosmetic surfaces.<\/li>\n<li><strong>Separate general and critical dimensions:<\/strong> apply a suitable general note, then call out the features that truly need individual control.<\/li>\n<li><strong>Check datum logic:<\/strong> make sure the drawing reference frame represents assembly and inspection conditions.<\/li>\n<li><strong>Review process risk:<\/strong> consider material, wall thickness, depth, tool reach, workholding, finishing, and expected quantity.<\/li>\n<li><strong>Define verification:<\/strong> state whether the requirement is checked with gauges, hand instruments, optical measurement, CMM, functional assembly, or another method.<\/li>\n<li><strong>Confirm post-processing condition:<\/strong> distinguish dimensions measured before and after heat treatment, coating, plating, or other finishing.<\/li>\n<li><strong>Ask for manufacturability feedback:<\/strong> let the supplier identify a callout that is tighter than the function requires or a requirement that lacks a clear acceptance method.<\/li>\n<\/ol>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">When the drawing, model, material, quantity, and inspection requirements are ready, send them through the <a href=\"https:\/\/www.jccncmachining.com\/es\/quote\/\">CNC machining quote workflow<\/a>. A clear package gives the supplier a chance to price the required precision instead of adding a risk buffer for unknowns.<\/p>\n<\/section>\n<section id=\"faq\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">CNC Machining Tolerances FAQs<\/h2>\n<h3 style=\"font-size: 24px; line-height: 2em;\">What is a typical CNC machining tolerance?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">There is no single tolerance that applies to every CNC part. The practical limit depends on the process, material, feature geometry, workholding, thermal condition, quantity, finish, and inspection method. Use the drawing\u2019s general tolerance for non-critical features and define tighter limits only where the function requires them.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Is a tighter tolerance always better?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">No. A tighter limit can add machining time, finishing effort, inspection time, and scrap risk without improving performance. The better specification is the loosest tolerance that reliably protects fit, function, sealing, motion, strength, or appearance.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Should I use plus-or-minus dimensions or GD&amp;T?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Use the notation that communicates the failure mode most clearly. Plus-or-minus limits are useful for size; GD&amp;T is often clearer for position, orientation, form, and profile. A mixed drawing is acceptable when each control has a defined purpose and the datum scheme is consistent.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">Do surface finishes affect CNC tolerances?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">They can. Coatings may add thickness, polishing removes material, and roughness can affect how a gauge, seal, or mating surface behaves. State whether a critical dimension applies before or after finishing and identify any masking or coating-thickness requirement.<\/p>\n<h3 style=\"font-size: 24px; line-height: 2em;\">What should I send a CNC supplier to review tolerance requirements?<\/h3>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Provide the current CAD model, controlled drawing, material and condition, quantity, revision, critical dimensions, GD&amp;T, surface finish, post-processing, inspection report expectations, and the part\u2019s functional context. That information supports a more realistic process and quote review.<\/p>\n<\/section>\n<footer>\n<div class=\"cta-box\">\n<h2 style=\"font-size: 28px; line-height: 2em;\">Need a tolerance-focused CNC review?<\/h2>\n<p style=\"font-size: 20px; line-height: 2em; text-align: left;\">Share the drawing, 3D model, material, quantity, finish, and assembly requirement. JUCHENG CNC Machining can review the tolerance strategy together with manufacturability and inspection planning.<\/p>\n<\/div>\n<\/footer>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>CNC machining tolerances are the controlled limits around a drawing\u2019s nominal dimensions. They determine whether a shaft fits a bore, whether a housing seals, whether an assembly aligns, and how much process and inspection discipline a part requires. The right tolerance is not the tightest value a machine might reach. It is the loosest limit [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2061,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[50,47,49,48],"class_list":["post-1975","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cnc-inspection","tag-cnc-tolerances","tag-gdt","tag-precision-machining"],"_links":{"self":[{"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/posts\/1975","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/comments?post=1975"}],"version-history":[{"count":8,"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/posts\/1975\/revisions"}],"predecessor-version":[{"id":2063,"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/posts\/1975\/revisions\/2063"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/media\/2061"}],"wp:attachment":[{"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/media?parent=1975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/categories?post=1975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jccncmachining.com\/es\/wp-json\/wp\/v2\/tags?post=1975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}