{"id":3267,"date":"2026-08-17T15:50:55","date_gmt":"2026-08-17T07:50:55","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=3267"},"modified":"2026-08-17T15:50:58","modified_gmt":"2026-08-17T07:50:58","slug":"detailed-interpretation-of-how-to-avoid-or-reduce-large-scale-chipping-and-damage-on-the-edges-and-corners-of-granite-countertops","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/ru\/2026\/08\/17\/detailed-interpretation-of-how-to-avoid-or-reduce-large-scale-chipping-and-damage-on-the-edges-and-corners-of-granite-countertops\/","title":{"rendered":"Detailed interpretation of how to avoid or reduce large-scale chipping and damage on the edges and corners of granite countertops."},"content":{"rendered":"

Detailed Analysis of Causes and Prevention of Large-Area Edge and Corner Chipping on Granite Platforms<\/h1>\n\n\n\n

Granite (such as Jinan Green) has high hardness and high brittleness. Edges and corners are weak points subject to stress concentration.<\/strong> Due to impact, compression, bumping, lifting, machining, and improper installation or use, large-area edge and corner chipping is extremely likely to occur. Small chips will gradually expand into large-area damage, directly scrapping 00\/000-grade high-precision platforms. Below is a full-process breakdown from raw materials, machining, chamfering, lifting and transportation, packaging, installation and commissioning, on-site use and maintenance, to repair and loss prevention<\/strong>, providing actionable prevention and control solutions.<\/p>\n\n\n\n

I. Raw Material Stage: Reducing Chipping Risks at the Source<\/h2>\n\n\n\n
    \n
  1. Prioritize selecting high-quality granite (Jinan Green) that is dense, has uniform grains, and is free of hidden cracks and bedding fissures. If invisible micro-cracks exist inside the stone, they will expand rapidly under stress at the edges and corners, directly forming large-area chips.<\/li>\n\n\n\n
  2. Avoid the cleavage planes and weathered layers of the stone; the edge and corner positions must not lie on the extension path of stone cracks. Visually inspect the edges and corners of each incoming piece for defects. Blanks with internal hidden cracks should be rejected immediately and not proceed to fine machining.<\/li>\n<\/ol>\n\n\n\n
    \n

    Key Point: No matter how good the machining process is, if the raw material has inherent hidden cracks, the edges and corners will inevitably chip later.<\/p>\n<\/blockquote>\n\n\n\n

    II. Machining Process: Preventing Edge Chipping During Machining<\/h2>\n\n\n\n
      \n
    1. Chamfering Treatment (The Most Critical Measure)<\/strong><\/li>\n<\/ol>\n\n\n\n
        \n
      • It is not recommended to have 90\u00b0 sharp corners on high-precision metrology platforms. Conventional specifications:<\/li>\n\n\n\n
      • Ordinary inspection platforms: C2-C5 chamfer (2-5mm \u00d7 45\u00b0);<\/li>\n\n\n\n
      • 000-grade CMM bases, heavy-duty granite platforms: C3-C8 large chamfers;
        Chamfering removes sharp corners and eliminates stress concentrations. Most bumps will only hit the chamfered slope and will not spread inward to form large-area damage.<\/li>\n\n\n\n
      • Note: Chamfering cannot be simply hand-ground; it requires overall milling with a diamond grinding wheel. The chamfered surface must be flat and free of fine serrations or micro-chips; if the chamfer itself is covered with micro-chips, they will continue to expand along the micro-chips later.<\/li>\n<\/ul>\n\n\n\n
        \n

        Many foreign trade customers overlook chamfering. It must be clearly specified in the technical agreement: All sharp edges chamfer C3-C5.<\/p>\n<\/blockquote>\n\n\n\n

          \n
        1. Grinding Process Control<\/li>\n<\/ol>\n\n\n\n
            \n
          • During rough grinding and semi-fine grinding stages, reduce the feed rate at the edge and corner positions to minimize the pulling and impact of the grinding wheel on the edges. High speed and large feed rates can easily tear off the stone at the edges and corners, forming original damage.<\/li>\n\n\n\n
          • Before fine grinding, check all four sides and corners first. Pre-grind and repair any small chips that have already appeared; do not proceed directly to the mirror-finish fine grinding process.<\/li>\n<\/ul>\n\n\n\n
              \n
            1. Prohibit Drilling and Slotting Near Edges and Corners
              Maintain a safety distance of at least \u226530-50mm from the platform edges. If holes or slots are too close to the edges and corners, the release of residual stress in the stone will easily cause large-area cracking at the edges and corners.<\/li>\n<\/ol>\n\n\n\n

              III. Lifting and Transportation: 70% of Large-Area Chipping Occurs in This Stage<\/h2>\n\n\n\n

              Granite platforms are heavy, and edge and corner bumping is the most frequent scenario for chipping.<\/p>\n\n\n\n

                \n
              1. Lifting Point Setup<\/strong>
                It is strictly forbidden to lift the platform by directly wrapping steel wire ropes around its four corners! The sharp edges of the wire ropes compress the corners, and the pressure at the moment of lifting will directly crush large chunks of the edges and corners.
                \u2705 Correct: Use soft-pad lifting tools or wrap the four corners with rubber corner protectors; prioritize using vacuum suction cups; or use a wooden pallet frame to support the lifting, so the force falls on the platform surface rather than the edges and corners.<\/li>\n\n\n\n
              2. Workshop Transportation:
                Cover the surface of the transport trolley with rubber mats; install detachable rubber corner protectors on the four corners of the platform for transportation.<\/li>\n<\/ol>\n\n\n\n

                IV. Export Packaging (Key in foreign trade, high incidence of corner chipping in sea container transport)<\/h2>\n\n\n\n

                Many products leave the factory intact, but arrive by sea with large-scale corner damage due to insufficient packaging protection.<\/p>\n\n\n\n

                  \n
                1. Use separate rigid corner protectors (hard plastic \/ multi-layer hard cardboard corner protectors) to tightly wrap the four corners;<\/li>\n\n\n\n
                2. Use a full wooden frame for the machine; the platform should be suspended and fixed inside the wooden box, ensuring the corners do not touch the inner walls of the box; fill the four sides inside the wooden box with cushioning foam to prevent movement and impact during transport;<\/li>\n\n\n\n
                3. Key markings on the wooden box: Edges are fragile, No collision, Do not lift by corners.<\/li>\n<\/ol>\n\n\n\n

                  V. On-site Installation and Commissioning<\/h2>\n\n\n\n
                    \n
                  1. During ground installation, it is strictly forbidden to hit the corners with steel wire ropes or forklift tines; forklift tines must be padded with thick rubber mats, and the tines should be positioned towards the inside, away from the four edges of the platform.<\/li>\n\n\n\n
                  2. Arrange the leveling support points towards the inside; do not place supports at the outermost edges; if support points are too close to the corners, the corners will experience bending stress under heavy loads, causing them to crack.<\/li>\n<\/ol>\n\n\n\n
                    \n

                    Design Specification: The distance from the support point to the platform edge should be 0.8-1.2 times the platform thickness; do not support at the outermost corners.<\/p>\n<\/blockquote>\n\n\n\n

                      \n
                    1. Protect the ground at the installation site to avoid tools or workpieces falling and hitting the corners; when heavy workpieces are hoisted over the platform, install protective shields.<\/li>\n<\/ol>\n\n\n\n

                      VI. Daily Use and Maintenance to Prevent Future Chipping<\/h2>\n\n\n\n
                        \n
                      1. Do not directly hit the four edges and corners of the platform with steel parts, measuring tools, or fixtures; handle workpieces gently, as impact loads are the primary cause of corner chipping.<\/li>\n\n\n\n
                      2. Do not tap or straighten workpieces on the platform corners; granite has poor impact resistance, and local impact forces can instantly cause large-scale chipping.<\/li>\n\n\n\n
                      3. Avoid extreme local temperature shocks to the corners; sudden changes in hot and cold will generate thermal stress, inducing crack propagation at the corners.<\/li>\n\n\n\n
                      4. Regularly inspect the corners; if tiny chips or hairline cracks appear, mark and treat them immediately, as tiny cracks will gradually expand into large-scale chipping due to vibration and loads.<\/li>\n<\/ol>\n\n\n\n

                        VII. How to Prevent Small Chips from Developing into Large-Scale Chipping<\/h2>\n\n\n\n
                          \n
                        1. For tiny chips: Use a diamond grinding head to grind the chamfer, eliminating the crack tip and cutting off the path for further crack extension;<\/li>\n\n\n\n
                        2. For cracks extending into the body: Do not just grind the surface; crack-stop holes must be drilled to prevent the crack from continuing to expand inward;<\/li>\n<\/ol>\n\n\n\n
                          \n

                          Note: Large-scale chipping cannot be restored to its original precision with glue; it can only be ground away to avoid the damage, which will lower the precision grade. Therefore, prevention is key.<\/p>\n<\/blockquote>\n\n\n\n

                          VIII. Summary of Common Pitfalls<\/h2>\n\n\n\n
                            \n
                          1. To meet the customer’s “right-angle appearance” requirement, no chamfering is done; it looks good at the factory, but the corners will inevitably chip during subsequent transport and use;<\/li>\n\n\n\n
                          2. Using steel wire ropes to press directly on the four corners during hoisting, and sea transport packaging that only covers the surface without protecting the corners;<\/li>\n\n\n\n
                          3. Drilling holes or cutting grooves too close to the corners, causing corner chipping due to stress release later on;<\/li>\n\n\n\n
                          4. Placing support points at the outer edges, causing the corners to crack under bending stress under heavy loads.<\/li>\n<\/ol>\n\n\n\n
                            \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

                            Detailed Analysis of Causes and Prevention of Large-Area Edge and Corner Chipping on Granite Platforms Granite (such as Jinan Green) has high hardness and high brittleness. Edges and corners are weak points subject to stress concentration. Due to impact, compression, bumping, lifting, machining, and improper installation or use, large-area edge and corner chipping is extremely…<\/p>","protected":false},"author":1,"featured_media":3268,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_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,"_kad_post_classname":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-3267","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"taxonomy_info":{"category":[{"value":35,"label":"NEWS"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/08\/w-1024x542.png",1024,542,true],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/ru\/author\/jtlcnc\/"},"comment_info":1,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":334,"filter":"raw","cat_ID":35,"category_count":334,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/posts\/3267","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/comments?post=3267"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/posts\/3267\/revisions"}],"predecessor-version":[{"id":3269,"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/posts\/3267\/revisions\/3269"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/media\/3268"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/media?parent=3267"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/categories?post=3267"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/ru\/wp-json\/wp\/v2\/tags?post=3267"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}