{"id":3403,"date":"2026-08-27T06:53:46","date_gmt":"2026-08-27T06:53:46","guid":{"rendered":"https:\/\/koreben.com\/?p=3403"},"modified":"2026-08-27T06:53:47","modified_gmt":"2026-08-27T06:53:47","slug":"critical-dimensions-automotive-injection-molding","status":"publish","type":"post","link":"https:\/\/koreben.com\/zh\/critical-dimensions-automotive-injection-molding\/","title":{"rendered":"The Most Important Dimension Is Not Always the Tightest One"},"content":{"rendered":"<h2 class=\"wp-block-heading\">What Is the Most Important Dimension in Automotive Injection Molding?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An automotive injection molded part can have dozens\u2014or even hundreds\u2014of dimensions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some may have a tolerance of:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00b10.10 mm<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Others may require:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00b10.05 mm<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And some critical features may be controlled even more tightly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So which dimension is the most important?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A common answer is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The dimension with the tightest tolerance.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But from a tooling and manufacturing perspective, that is not necessarily correct.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A dimension can have a very tight tolerance and still have relatively little functional impact.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Meanwhile, another dimension with a seemingly less demanding tolerance may determine whether the component:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Assembles correctly<\/li>\n\n\n\n<li>Aligns with another component<\/li>\n\n\n\n<li>Maintains a seal<\/li>\n\n\n\n<li>Holds a connector in position<\/li>\n\n\n\n<li>Fits into the vehicle<\/li>\n\n\n\n<li>Performs its intended function<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The better question is not:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cWhich dimension has the smallest tolerance?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">It is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cWhich dimension controls the function of the part?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">01 \u2014 Not Every Dimension Has the Same Job<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Dimensions on an automotive plastic component do not all serve the same purpose.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some dimensions are primarily:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cosmetic<\/li>\n\n\n\n<li>Structural<\/li>\n\n\n\n<li>Locating<\/li>\n\n\n\n<li>Assembly-related<\/li>\n\n\n\n<li>Sealing-related<\/li>\n\n\n\n<li>Interface-related<\/li>\n\n\n\n<li>Clearance-related<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Consider a simple plastic housing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its overall length may be important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But the distance between two mounting holes may be far more important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The wall thickness may be important for structural performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But the position of a connector opening may be critical because it determines whether the mating connector can actually engage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why tolerance should never be considered independently from function.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tolerance tells us how much variation is allowed. Function tells us why the dimension matters.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">02 \u2014 Interface Dimensions Often Come First<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive plastic components rarely work in isolation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They interact with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Metal brackets<\/li>\n\n\n\n<li>Connectors<\/li>\n\n\n\n<li>PCB assemblies<\/li>\n\n\n\n<li>Fasteners<\/li>\n\n\n\n<li>Clips<\/li>\n\n\n\n<li>Sensors<\/li>\n\n\n\n<li>Seals<\/li>\n\n\n\n<li>Adjacent plastic components<\/li>\n\n\n\n<li>Vehicle body structures<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This makes interface dimensions particularly important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A housing may be dimensionally accurate overall but still fail assembly because one critical interface is out of position.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A connector opening can have the correct size.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But if the opening is shifted by a small amount relative to the mounting datum, the mating connector may no longer align correctly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The problem is not necessarily the size of the opening.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The problem is its location.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">03 \u2014 Mounting Holes: Position Can Matter More Than Diameter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most common examples is a mounting hole.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Engineers sometimes focus heavily on hole diameter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But in many automotive applications, hole position can be more critical than the hole itself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consider a component with several mounting points.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You may need to control:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hole diameter<\/li>\n\n\n\n<li>Hole-to-hole pitch<\/li>\n\n\n\n<li>Hole-to-datum distance<\/li>\n\n\n\n<li>Hole position<\/li>\n\n\n\n<li>True position<\/li>\n\n\n\n<li>Perpendicularity<\/li>\n\n\n\n<li>Local flatness<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A hole with the correct diameter but incorrect position may still prevent assembly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Hole size and hole location should be treated as two different engineering problems.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">For mounting features, the relationship between the hole and the part&#8217;s datum system is often critical.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">04 \u2014 Datums: Where Does the Measurement Start?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A dimension only becomes meaningful when we know <strong>what it is measured from<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is where datums become important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A typical GD&amp;T reference system may establish:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Datum A \u2192 Primary plane<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Datum B \u2192 Secondary location<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Datum C \u2192 Tertiary location<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This creates a functional reference frame for the part.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the datum structure does not represent how the component actually locates in the vehicle, a drawing can contain many precise dimensions and still fail to control the real assembly condition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For injection molded automotive components, this becomes even more important because the part may experience:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shrinkage<\/li>\n\n\n\n<li>Warpage<\/li>\n\n\n\n<li>Draft<\/li>\n\n\n\n<li>Local deformation<\/li>\n\n\n\n<li>Mold parting effects<\/li>\n\n\n\n<li>Measurement variation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The measurement system needs to reflect the functional way the component is located.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A good tolerance scheme starts with a good datum strategy.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">05 \u2014 Connector Dimensions Can Be More Critical Than Overall Dimensions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive electronics are a particularly good example.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A plastic housing may contain a connector interface that must align with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Terminals<\/li>\n\n\n\n<li>Mating connectors<\/li>\n\n\n\n<li>PCB components<\/li>\n\n\n\n<li>Seals<\/li>\n\n\n\n<li>Locking mechanisms<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A small positional error can affect:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mating \u2192 Electrical connection \u2192 Assembly \u2192 System function<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means dimensions around the connector can be much more critical than the overall dimensions of the housing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connector opening position<\/li>\n\n\n\n<li>Connector interface geometry<\/li>\n\n\n\n<li>Terminal alignment<\/li>\n\n\n\n<li>Locking feature position<\/li>\n\n\n\n<li>Connector-to-datum distance<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">may all require careful control.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The housing does not have to be perfect everywhere.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But the <strong>functional interfaces<\/strong> need to be controlled where they matter.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">06 \u2014 Sealing Dimensions Are Functional Dimensions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sealing surfaces deserve another level of attention.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is particularly true for components such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ECU housings<\/li>\n\n\n\n<li>Sensor housings<\/li>\n\n\n\n<li>Electrical enclosures<\/li>\n\n\n\n<li>Battery-related components<\/li>\n\n\n\n<li>Fluid-exposed automotive components<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the design, critical features may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sealing lips<\/li>\n\n\n\n<li>Gasket grooves<\/li>\n\n\n\n<li>Compression height<\/li>\n\n\n\n<li>Sealing surface flatness<\/li>\n\n\n\n<li>Local profile<\/li>\n\n\n\n<li>Interface dimensions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A small dimensional change can alter gasket compression or the contact condition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Again, the important point is not that the tolerance is necessarily the tightest one on the drawing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is important because:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The dimension controls a function.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">07 \u2014 Snap-Fits: Small Features, Large Consequences<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Snap-fits are another example.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A snap-fit may look like a relatively small feature on the CAD model.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But its dimensions can determine:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Assembly force<\/li>\n\n\n\n<li>Retention force<\/li>\n\n\n\n<li>Engagement<\/li>\n\n\n\n<li>Deflection<\/li>\n\n\n\n<li>Clearance<\/li>\n\n\n\n<li>Long-term durability<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A small change in hook position or engagement geometry can make the part:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Too difficult to assemble<\/li>\n\n\n\n<li>Too loose<\/li>\n\n\n\n<li>Difficult to disassemble<\/li>\n\n\n\n<li>More vulnerable to breakage<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is why critical assembly features should be identified early rather than treated as ordinary geometry.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">08 \u2014 Why Is This Especially Difficult in Injection Molding?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The final dimensions of an injection molded part do not come directly from CAD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They are the result of the interaction between:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Part Design + Material + Mold Design + Process + Cooling<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Material shrinkage can affect dimensions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fiber orientation can create directional shrinkage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Uneven cooling can contribute to warpage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gate location can influence the local flow and packing behavior.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Injection pressure and packing conditions can affect dimensional stability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means a critical dimension cannot always be solved simply by tightening the tolerance on the drawing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes the real solution is in the tooling strategy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Critical mounting feature<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Gate location<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Flow direction<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling balance<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Shrinkage \/ warpage<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Final position<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The dimension on the drawing may be the final symptom.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The root cause may be much earlier in the molding process.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">09 \u2014 The Mold Engineer&#8217;s Perspective<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When a dimension is functionally critical, the engineering team should work backward from the requirement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Start with:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What does this feature need to do?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then ask:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How does it locate?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What does it mate with?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What loads does it experience?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Does it need to seal?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Does it need to maintain a specific clearance?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then move into manufacturing:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What material is being used?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Where is the gate?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How will the cavity fill?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How will the part cool?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Where is shrinkage likely to occur?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Could fiber orientation affect the result?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Could warpage move the feature?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is the difference between simply manufacturing a dimension and <strong>engineering a dimension<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">10 \u2014 Which Dimensions Should Get the Most Attention?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not every dimension needs the same level of control.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A practical way to prioritize them is:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tier 1 \u2014 Functional and Interface Dimensions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">These usually deserve the highest attention:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mounting locations<\/li>\n\n\n\n<li>Connector interfaces<\/li>\n\n\n\n<li>Locating features<\/li>\n\n\n\n<li>Sealing surfaces<\/li>\n\n\n\n<li>Critical hole positions<\/li>\n\n\n\n<li>Mating interfaces<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Tier 2 \u2014 Assembly Dimensions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Snap-fits<\/li>\n\n\n\n<li>Clips<\/li>\n\n\n\n<li>Fasteners<\/li>\n\n\n\n<li>Clearances<\/li>\n\n\n\n<li>Engagement features<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Tier 3 \u2014 Structural Dimensions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wall thickness<\/li>\n\n\n\n<li>Boss dimensions<\/li>\n\n\n\n<li>Rib geometry<\/li>\n\n\n\n<li>Structural sections<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Tier 4 \u2014 Cosmetic Dimensions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">These still matter, particularly for visible automotive components, but their importance depends on the product requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The key is not to assume that every dimension should be controlled equally.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The right tolerance is the tolerance that supports the required function.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">The Engineering Rule<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">There are hundreds of dimensions on a typical automotive plastic component.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trying to control every one of them with the same priority is neither practical nor necessarily useful.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Instead, identify the dimensions that control:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Location<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Assembly<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Sealing<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Interface<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Clearance<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Structural performance<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then make sure the product design, datum scheme, mold design, material selection, cooling strategy, and measurement method all support those requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because the most important dimension is not necessarily:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>the smallest number on the drawing.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">It is the dimension that can change the function of the part when it moves.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Don&#8217;t control every dimension equally.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Control the dimensions that control the function.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn which dimensions matter most in automotive injection molding, from mounting holes and connector interfaces to sealing surfaces, datums and assembly features.<\/p>","protected":false},"author":2,"featured_media":3405,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,15,74,13],"tags":[104,103,101,102,100,25,27,52,44,29],"class_list":["post-3403","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advanced-molding","category-automotive","category-blog","category-industries","tag-automotive-mold-design","tag-automotive-plastic-components","tag-automotive-plastic-part-dimensions","tag-critical-dimensions-in-injection-molding","tag-injection-molding-tolerances","tag-manufacturing-engineering","tag-plastic-part-design","tag-precision-molding","tag-product-development","tag-tooling-engineering"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/posts\/3403","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/comments?post=3403"}],"version-history":[{"count":2,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/posts\/3403\/revisions"}],"predecessor-version":[{"id":3406,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/posts\/3403\/revisions\/3406"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/media\/3405"}],"wp:attachment":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/media?parent=3403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/categories?post=3403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/tags?post=3403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}