{"id":4364,"date":"2026-10-24T04:25:53","date_gmt":"2026-10-24T04:25:53","guid":{"rendered":"https:\/\/welleltron.com\/?page_id=4364"},"modified":"2026-10-24T04:48:06","modified_gmt":"2026-10-24T04:48:06","slug":"drilling-defects","status":"publish","type":"page","link":"https:\/\/welleltron.com\/fr\/kb\/drilling-defects\/","title":{"rendered":"Drilling Defects"},"content":{"rendered":"<style>.kb-table-of-content-nav.kb-table-of-content-id4364_eae257-65 .kb-table-of-content-wrap{padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kb-table-of-content-nav.kb-table-of-content-id4364_eae257-65 .kb-table-of-contents-title-wrap{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id4364_eae257-65 .kb-table-of-contents-title{font-weight:regular;font-style:normal;}.kb-table-of-content-nav.kb-table-of-content-id4364_eae257-65 .kb-table-of-content-wrap .kb-table-of-content-list{font-weight:regular;font-style:normal;margin-top:var(--global-kb-spacing-sm, 1.5rem);margin-right:0px;margin-bottom:0px;margin-left:0px;}<\/style>\n\n\n<h2 class=\"wp-block-heading\">1.What Are PCB Drilling Defects?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Drilling defects encompass any deviation from specified dimensional, geometric, or surface integrity requirements on a machined hole. Unidentified or uncorrected defects compromise subsequent mechanical assemblies, weaken structural joints, and trigger expensive component scrap.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It helps to separate problems into four groups:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hole size:<\/strong> Diameter outside the specified limits.<\/li>\n\n\n\n<li><strong>Hole position:<\/strong> A hole or hole pattern displaced from its required location.<\/li>\n\n\n\n<li><strong>Hole-wall condition:<\/strong> Roughness, resin smear, or other internal abnormalities.<\/li>\n\n\n\n<li><strong>Material damage:<\/strong> Burrs, local separation, or damage around the hole.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Common PCB Drilling Defects and How to Identify Them<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Record the condition before cleaning, sectioning, or attempting rework. Preserve the panel identification, hole location, manufacturing stage, and relevant tool history.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hole Size and Position Errors<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An oversized or undersized hole requires measurement against the correct specification. Confirm whether the limit applies to the drilled opening or the finished hole after subsequent processing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Burrs and Hole-Wall Abnormalities<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the entrance and exit separately. A raised edge at the hole opening is different from an irregularity farther inside the barrel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Resin Smear<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Resin smear occurs when <a href=\"https:\/\/welleltron.com\/fr\/pcb-consumables\/drill-bit-and-router-bit\/pcb-router-bit\/\">drilling<\/a>-generated heat causes resin to transfer onto exposed copper surfaces in the hole. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Smear should be distinguished from other residues or preparation artifacts using suitable inspection evidence.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Suspected defect<\/th><th>Evidence to collect<\/th><th>What the observation does not prove<\/th><\/tr><\/thead><tbody><tr><td>Oversized or undersized hole<\/td><td>Diameter results, measurement location, and process stage<\/td><td>That tool wear is the cause<\/td><\/tr><tr><td>Hole misalignment<\/td><td>Coordinates relative to drawing datums<\/td><td>That the spindle alone is responsible<\/td><\/tr><tr><td>Entrance or exit burr<\/td><td>Images showing the affected side and surrounding material<\/td><td>That internal hole quality is acceptable<\/td><\/tr><tr><td>Rough hole wall<\/td><td>Appropriate internal images or cross-sections<\/td><td>That one parameter change will resolve it<\/td><\/tr><tr><td>Resin smear<\/td><td>Evidence of resin covering the relevant copper interface<\/td><td>That subsequent processing has removed it adequately<\/td><\/tr><tr><td>Suspected separation or delamination<\/td><td>Images or sections defining the affected region<\/td><td>That drilling caused the separation<\/td><\/tr><tr><td>Incomplete penetration<\/td><td>Hole-depth evidence and machine records<\/td><td>That the programmed depth was the only contributing factor<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2.Is the Problem Caused by Drilling or a Later Process?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A defect found on a finished PCB does not automatically originate during drilling.<\/strong> Hole preparation, plating, handling, and measurement conditions can affect what you observe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Start by confirming the inspection stage. A drilled-hole diameter and a finished plated-hole diameter describe different conditions and should be compared with their respective requirements.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Compare the same feature across stages.<\/strong> Review images and measurements taken after drilling, after hole preparation, and after plating to establish when the abnormality first appears.<\/li>\n\n\n\n<li><strong>Verify the measurement setup.<\/strong> Check the datum, measurement location, lighting, edge detection, and repeatability before concluding that the hole has changed.<\/li>\n\n\n\n<li><strong>Use evidence suited to the defect.<\/strong> Dimensional measurements assess size and position; appropriate internal inspection or microsections help investigate hole-wall conditions.<\/li>\n\n\n\n<li><strong>Review process records.<\/strong> Connect the affected features to tool history, machine records, processing batches, and handling events.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">An abnormality documented immediately after drilling supports investigating that operation. One first observed later requires investigation of subsequent processes as well. The stage where a defect is discovered may differ from the stage where it originated.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"850\" height=\"850\" src=\"https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Carbide-Drill-Bit_3.png\" alt=\"Drilling Defects\" class=\"wp-image-1201\" style=\"width:599px;height:auto\" srcset=\"https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Carbide-Drill-Bit_3.png 850w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Carbide-Drill-Bit_3-300x300.png 300w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Carbide-Drill-Bit_3-150x150.png 150w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Carbide-Drill-Bit_3-768x768.png 768w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Carbide-Drill-Bit_3-600x600.png 600w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Carbide-Drill-Bit_3-100x100.png 100w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">3.How to Troubleshoot PCB Hole Size and Position Errors<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Confirm the Program and Tool Identification<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check the released drill data, units, tool assignments, hole coordinates, and relevant compensation settings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the installed tool against the required specification. Keep drill diameter, finished-hole requirement, and measured result separate in the investigation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Examine How the Error Is Distributed<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sort results by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spindle or machine.<\/li>\n\n\n\n<li>Drill identity and usage history.<\/li>\n\n\n\n<li>Panel location.<\/li>\n\n\n\n<li>Position within the drilling stack.<\/li>\n\n\n\n<li>Time or sequence of production.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These patterns help form hypotheses. A problem concentrated on one spindle suggests a different investigation from an entire hole pattern shifted on every panel. Neither pattern proves a cause by itself.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Review Location and Holding Conditions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect panel registration, stack preparation, clamping, and support. Confirm that the material could not move during the relevant operation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Check the Tool and Spindle System<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the drill, <a href=\"https:\/\/welleltron.com\/fr\/pcb-drilling-routing\/collet\/collet-pcb-drilling\/\">collet<\/a>, and relevant machine condition using the equipment\u2019s prescribed procedures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4.How to Investigate Burrs, Hole-Wall Damage, and Broken Drills<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Investigate each defect using its location, appearance, and production history. These problems may share contributing factors, but they do not necessarily require the same correction.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Problem<\/th><th>Evidence to collect<\/th><th>Checks to prioritize<\/th><\/tr><\/thead><tbody><tr><td><strong>Burrs<\/strong><\/td><td>Images of the hole entrance and exit, affected panel locations, and tool history<\/td><td>Cutting-edge condition, entry and backup materials, stack support, pressure-foot contact, and drilling conditions<\/td><\/tr><tr><td><strong>Hole-wall damage<\/strong><\/td><td>Suitable internal images or microsections showing the affected depth<\/td><td>Material construction, drill condition, chip evacuation, stack height, and process-stage records<\/td><\/tr><tr><td><strong>Broken drills<\/strong><\/td><td>Broken tool, fracture location, associated hole, alarms, and usage history<\/td><td>Chucking, runout, chip accumulation, tool geometry, stack preparation, and penetration settings<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For <strong>burrs<\/strong>, identify which side is affected before adjusting the process. Both excessive and insufficient chipload can contribute through different mechanisms, so reducing feed is not a universal solution.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5.Verify Corrective Actions with Controlled Trials<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A corrective action should demonstrate measurable improvement under defined conditions.<\/strong> Replacing a drill or changing a parameter is not enough without checking the resulting hole quality.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Record the baseline.<\/strong> Document the original defect, affected locations, tool condition, material, and process settings. Define acceptance criteria before testing.<\/li>\n\n\n\n<li><strong>State the hypothesis.<\/strong> Identify the suspected cause and explain what result would support or challenge it.<\/li>\n\n\n\n<li><strong>Control the trial.<\/strong> Where practical, change one factor while keeping other conditions consistent. For interacting variables, use a planned experiment rather than undocumented adjustments.<\/li>\n\n\n\n<li><strong>Repeat the inspection.<\/strong> Use the same measurement methods, locations, and evaluation rules. Check hole size, position, burrs, and internal quality as relevant\u2014not only the original symptom.<\/li>\n\n\n\n<li><strong>Confirm production performance.<\/strong> Verify the correction under the conditions associated with the failure, then document the results and update the approved process.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">6.Containment, Tool Maintenance, and Recurrence Prevention<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Once a drilling defect is confirmed, control the potentially affected material before continuing production.<\/strong> Use inspection results and process records to determine the scope, then verify the correction before release.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Contain affected material.<\/strong> Identify relevant panels and batches using tool history, spindle records, production sequence, and the last verified acceptable condition. Segregate material awaiting evaluation.<\/li>\n\n\n\n<li><strong>Follow approved disposition procedures.<\/strong> Define the required reinspection and acceptance criteria. Do not enlarge holes or remove damaged material without approval, as this may change the design requirements.<\/li>\n\n\n\n<li><strong>Maintain tools based on evidence.<\/strong> Review cutting-edge condition, usage history, chucking, and hole-quality trends. Set inspection and replacement criteria for the actual material and process rather than assuming one universal drill life.<\/li>\n\n\n\n<li><strong>Document verified changes.<\/strong> Update setup instructions, maintenance checks, and inspection procedures to reflect the confirmed cause and corrective action.<\/li>\n\n\n\n<li><strong>Monitor subsequent production.<\/strong> Check whether the improvement holds across relevant tools, panel locations, and production conditions.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Keep the original defect, investigation, material disposition, and verification results linked in the quality record. This makes recurring problems easier to recognize and investigate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7.PCB Drilling Defects FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Why is a drilled hole larger than expected?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">First confirm the required process stage, installed drill specification, and measurement method. Then investigate tool condition, holding, and machine behavior. An oversized result alone does not identify the cause.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can a worn drill cause more than one defect?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, tool condition can influence several aspects of hole quality. The relationship should be confirmed through inspection and a controlled comparison, rather than inferred from wear alone.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does a clean hole entrance prove good hole-wall quality?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. The entrance is only one visible part of the feature. Internal requirements may need additional observation or cross-section evidence.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Should spindle speed always be reduced when drilling defects appear?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. The appropriate response depends on the defect mechanism, material, drill geometry, and operating conditions. A speed change without understanding the cause can introduce another problem.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can electrical testing confirm acceptable drilling quality?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Electrical testing evaluates specified electrical characteristics. It does not replace hole-size, position, or internal-quality inspection. Use separate checks for the requirements that electrical testing cannot establish.<\/p>","protected":false},"excerpt":{"rendered":"<p>1.What Are PCB Drilling Defects? Drilling defects encompass any deviation from specified dimensional, geometric, or surface integrity requirements on a machined hole. Unidentified or uncorrected defects compromise subsequent mechanical assemblies, weaken structural joints, and trigger expensive component scrap. It helps to separate problems into four groups: Common PCB Drilling Defects and How to Identify Them&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"parent":2541,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"left","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-4364","page","type-page","status-publish","hentry"],"taxonomy_info":[],"featured_image_src_large":false,"author_info":{"display_name":"lucaismilelove@gmail.com","author_link":"https:\/\/welleltron.com\/fr\/blog\/author\/luciasmilelovegmail-com\/"},"comment_info":0,"_hostinger_reach_plugin_has_subscription_block":false,"_hostinger_reach_plugin_is_elementor":false,"spectra_custom_meta":{"_uagb_previous_block_counts":["a:90:{s:21:\"uagb\/advanced-heading\";i:0;s:15:\"uagb\/blockquote\";i:0;s:12:\"uagb\/buttons\";i:0;s:18:\"uagb\/buttons-child\";i:0;s:19:\"uagb\/call-to-action\";i:0;s:15:\"uagb\/cf7-styler\";i:0;s:11:\"uagb\/column\";i:0;s:12:\"uagb\/columns\";i:0;s:14:\"uagb\/container\";i:0;s:21:\"uagb\/content-timeline\";i:0;s:27:\"uagb\/content-timeline-child\";i:0;s:14:\"uagb\/countdown\";i:0;s:12:\"uagb\/counter\";i:0;s:8:\"uagb\/faq\";i:0;s:14:\"uagb\/faq-child\";i:0;s:10:\"uagb\/forms\";i:0;s:17:\"uagb\/forms-accept\";i:0;s:19:\"uagb\/forms-checkbox\";i:0;s:15:\"uagb\/forms-date\";i:0;s:16:\"uagb\/forms-email\";i:0;s:17:\"uagb\/forms-hidden\";i:0;s:15:\"uagb\/forms-name\";i:0;s:16:\"uagb\/forms-phone\";i:0;s:16:\"uagb\/forms-radio\";i:0;s:17:\"uagb\/forms-select\";i:0;s:19:\"uagb\/forms-textarea\";i:0;s:17:\"uagb\/forms-toggle\";i:0;s:14:\"uagb\/forms-url\";i:0;s:14:\"uagb\/gf-styler\";i:0;s:15:\"uagb\/google-map\";i:0;s:11:\"uagb\/how-to\";i:0;s:16:\"uagb\/how-to-step\";i:0;s:9:\"uagb\/icon\";i:0;s:14:\"uagb\/icon-list\";i:0;s:20:\"uagb\/icon-list-child\";i:0;s:10:\"uagb\/image\";i:0;s:18:\"uagb\/image-gallery\";i:0;s:13:\"uagb\/info-box\";i:0;s:18:\"uagb\/inline-notice\";i:0;s:11:\"uagb\/lottie\";i:0;s:21:\"uagb\/marketing-button\";i:0;s:10:\"uagb\/modal\";i:0;s:18:\"uagb\/popup-builder\";i:0;s:16:\"uagb\/post-button\";i:0;s:18:\"uagb\/post-carousel\";i:0;s:17:\"uagb\/post-excerpt\";i:0;s:14:\"uagb\/post-grid\";i:0;s:15:\"uagb\/post-image\";i:0;s:17:\"uagb\/post-masonry\";i:0;s:14:\"uagb\/post-meta\";i:0;s:18:\"uagb\/post-taxonomy\";i:0;s:18:\"uagb\/post-timeline\";i:0;s:15:\"uagb\/post-title\";i:0;s:20:\"uagb\/restaurant-menu\";i:0;s:26:\"uagb\/restaurant-menu-child\";i:0;s:11:\"uagb\/review\";i:0;s:12:\"uagb\/section\";i:0;s:14:\"uagb\/separator\";i:0;s:11:\"uagb\/slider\";i:0;s:17:\"uagb\/slider-child\";i:0;s:17:\"uagb\/social-share\";i:0;s:23:\"uagb\/social-share-child\";i:0;s:16:\"uagb\/star-rating\";i:0;s:23:\"uagb\/sure-cart-checkout\";i:0;s:22:\"uagb\/sure-cart-product\";i:0;s:15:\"uagb\/sure-forms\";i:0;s:22:\"uagb\/table-of-contents\";i:0;s:9:\"uagb\/tabs\";i:0;s:15:\"uagb\/tabs-child\";i:0;s:18:\"uagb\/taxonomy-list\";i:0;s:9:\"uagb\/team\";i:0;s:16:\"uagb\/testimonial\";i:0;s:14:\"uagb\/wp-search\";i:0;s:19:\"uagb\/instagram-feed\";i:0;s:10:\"uagb\/login\";i:0;s:17:\"uagb\/loop-builder\";i:0;s:18:\"uagb\/loop-category\";i:0;s:20:\"uagb\/loop-pagination\";i:0;s:15:\"uagb\/loop-reset\";i:0;s:16:\"uagb\/loop-search\";i:0;s:14:\"uagb\/loop-sort\";i:0;s:17:\"uagb\/loop-wrapper\";i:0;s:13:\"uagb\/register\";i:0;s:19:\"uagb\/register-email\";i:0;s:24:\"uagb\/register-first-name\";i:0;s:23:\"uagb\/register-last-name\";i:0;s:22:\"uagb\/register-password\";i:0;s:30:\"uagb\/register-reenter-password\";i:0;s:19:\"uagb\/register-terms\";i:0;s:22:\"uagb\/register-username\";i:0;}"],"_edit_lock":["1792817378:1"],"rank_math_internal_links_processed":["1"],"rank_math_seo_score":["72"],"rank_math_focus_keyword":["Drilling 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Are PCB Drilling Defects? Drilling defects encompass any deviation from specified dimensional, geometric, or surface integrity requirements on a machined hole. Unidentified or uncorrected defects compromise subsequent mechanical assemblies, weaken structural joints, and trigger expensive component scrap. It helps to separate problems into four groups: Common PCB Drilling Defects and How to Identify Them...","_links":{"self":[{"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/pages\/4364","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/comments?post=4364"}],"version-history":[{"count":2,"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/pages\/4364\/revisions"}],"predecessor-version":[{"id":4367,"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/pages\/4364\/revisions\/4367"}],"up":[{"embeddable":true,"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/pages\/2541"}],"wp:attachment":[{"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/media?parent=4364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/categories?post=4364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/welleltron.com\/fr\/wp-json\/wp\/v2\/tags?post=4364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}