{"id":3004,"date":"2026-06-27T08:18:04","date_gmt":"2026-06-27T00:18:04","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=3004"},"modified":"2026-06-27T08:18:06","modified_gmt":"2026-06-27T00:18:06","slug":"how-to-choose-a-granite-machine-base-with-threaded-inserts-that-is-suitable-for-yourself","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/fr\/2026\/06\/27\/how-to-choose-a-granite-machine-base-with-threaded-inserts-that-is-suitable-for-yourself\/","title":{"rendered":"Comment choisir un socle de machine en granit avec des inserts filet\u00e9s qui vous convienne ?"},"content":{"rendered":"

Complete Selection Guide for High-Precision Granite Machine Tool Bases with Threaded Inserts
Follow the 7-step screening process: Application Scenario \u2192 Material \u2192 Precision \u2192 Dimensions & Thickness \u2192 Threaded Insert Configuration \u2192 Supporting Structure \u2192 Manufacturer Process to avoid common pitfalls such as hole deformation, insert detachment, insufficient precision, and inadequate rigidity in one go.
I. Step 1: Determine Precision Grade Based on Equipment Purpose (Most Critical)
Referring to the national standard GB\/T20428, a large number of threaded inserts will increase machining difficulty. Match directly according to the equipment’s precision requirements:
Grade 000 (Ultra-precision, dedicated to small dimensions)
Flatness \u2264 1.5\u03bcm\/m, total diagonal tolerance K=1
Applications: Wafer dicing machines, lens grinding, coordinate grinders, nano-optical equipment, interferometer bases
Limitations: Base length and width \u2264 1200mm, cannot be fully covered with M10\/M12 heavy-duty inserts; difficult to achieve stable standards for large sizes, costs increase by 30%
Grade 00 (Preferred choice for general precision machine tools)
Flatness \u2264 3\u03bcm\/m, total diagonal tolerance K=2
Applications: Micro-hole CNC, precision engraving machines, fully automatic vision measuring machines, multi-axis linear modules, PCB\/FPC processing equipment
Advantages: Stable mass production is possible for both large and small bases with full-grid threaded inserts; highest cost-performance ratio; the vast majority of precision machine tools use this grade
Grade 0 (Conventional automation equipment)
Flatness \u2264 6\u03bcm\/m
Applications: Ordinary visual inspection, dispensing, screw locking, grinding fixture bases; can be selected if there are no micron-level machining requirements
Synchronous supporting precision requirements (Must-read for machine tool bases):
Working surface roughness Ra \u2264 0.32\u03bcm; side perpendicularity \u2264 2\u03bcm\/m; threaded hole position tolerance \u00b10.1mm
II. Step 2: Granite Raw Material Selection, Directly Determining Long-term Stability<\/p>\n\n\n\n

    \n
  1. High-end Ultra-precision Equipment (Semiconductor \/ Optical \/ Coordinate Grinding)
    Jinan Qinghui Green Granite (Preferred)
    Density \u2265 2.97g\/cm\u00b3, fine-grained without impurities, thermal expansion coefficient 2.5~4.6\u00d710\u207b\u2076\/\u2103, Shore hardness \u2265 70HS, extremely low water absorption, no internal stress, minimal long-term precision decay; suitable for constant-temperature high-precision equipment.<\/li>\n\n\n\n
  2. Mid-to-High-end Precision CNC, Vision Inspection Equipment
    Zhangqiu Black \/ Indian Black Granite (Cost-effective alternative)
    Performance close to Jinan Qing, price 15%~25% lower; suitable for 3C, lithium battery, and general precision machining machine tools; stability meets long-term use for Grade 00.<\/li>\n\n\n\n
  3. Ordinary Automation Fixtures (Limited Budget)
    Ordinary Sesame Black; only recommended for Grade 0 bases, not recommended for micron-level machining machine tools.
    \u274c Prohibited Materials: White marble, coarse-grained multicolored granite; prone to deformation, low hardness, and oil seepage\/cracking.
    III. Step 3: Matching Base Length, Width, and Thickness Rigidity (The more holes, the thicker the base must be)<\/li>\n\n\n\n
  4. Length and Width Determination Rules
    Base Length and Width = Maximum equipment travel 100~150mm reserved installation space on each side, reserving space for guide rails, motors, and protective covers.<\/li>\n\n\n\n
  5. Thickness Rigidity Standards (Thickening requirements for threaded inserts)
    Ordinary measuring platforms: Thickness \u2265 Length \u00f7 15;
    Machine tool bases (with a large number of threaded inserts) must be thickened by 1.5 times to prevent stone rigidity reduction and grinding deformation after drilling and embedding:
    Small bases up to 600\u00d7800: Thickness \u2265 120mm; for heavy-duty full-coverage M10 inserts, 150mm is recommended
    Medium bases 1000\u00d7800~1500\u00d71000: Base thickness 150~200mm
    Large gantry bases over 1500mm: Thickness \u2265 220~300mm
    Load-bearing reference
    <\/li>\n<\/ol>\n\n\n\n

    IV. Step 4: Full Parameter Selection for Threaded Inserts (Crucial for preventing detachment and stripping)<\/p>\n\n\n\n

      \n
    1. Insert Material (Mandatory for machine tools: 304\/316 stainless steel thickened bushings)
      Standard dry equipment: 304 stainless steel threaded inserts
      Contact with cutting fluids, cleaning solvents, or humid environments: 316 stainless steel, rustproof and corrosion-resistant
      \u274c Brass and ordinary carbon steel are prohibited; they rust in long-term oily environments and have insufficient pull-out strength<\/li>\n\n\n\n
    2. Thread Specification Matching Installation Screws
      Small optical and vision modules: M6 (light load)
      Mainstream guide rails, sliding tables, cameras, and tooling: M8 (industry standard)
      Spindles, heavy-duty gantry machines, and heavy motors: M10 \/ M12
      Imported equipment inch-sized parts: 1\/4-20, 3\/8-16 customized inserts<\/li>\n\n\n\n
    3. Insert Layout Scheme Selection Based on Needs
      Full grid layout: 50\/100mm standard matrix, for tooling with frequent product switching or multi-axis module equipment; requires thickened base for dense hole drilling
      Local area hole drilling: Pre-embed only in guide rail and motor installation areas, leaving the rest smooth to reduce costs and stone stress
      Multi-surface inserts: Pre-embed on top, side, and bottom surfaces; side surfaces for mounting guard brackets, bottom surface for fixing vibration-damping brackets<\/li>\n\n\n\n
    4. Hard Process Requirements (Confirm with manufacturer before purchasing)
      Insert countersink depth 0.3~1mm below the surface, flush after grinding, without affecting guide rail fit;
      Hole edge distance to stone edge \u226550mm, center-to-center distance between holes \u2265100mm to avoid stone cracking;
      Epoxy structural adhesive fully filled and cured for over 72h before overall constant-temperature grinding; pull-out strength of a single insert \u2265400kg without loosening;
      Provide a standard tightening torque table to prevent screws from over-tightening and pulling out the insert.
      V. Step 5: Machine-Specific Supporting Structures Added as Needed
      Guide rail installation steps \/ clearance grooves: Direct recessed installation for linear guide rails and scales to improve straightness and reduce shim usage;
      Chip removal grooves: Essential for CNC and drilling machines to prevent cutting fluids from soaking the stone for long periods;
      Lifting threaded inserts: Pre-embed lifting holes on the bottom of large-sized bases for safe handling, avoiding direct damage to the surface by steel wire ropes;
      Anti-seepage glazing treatment: Full-machine anti-seepage sealing to prevent oil and cutting fluids from penetrating the stone interior;
      Composite T-slots threaded inserts: For multi-functional machines requiring both guide rail fixing and rapid workpiece clamping;
      Vibration-damping accessories: Pair with granite-specific cast iron brackets inflatable vibration-damping pads to isolate floor vibrations and improve machining finish.
      VI. Step 6: Selection Based on Operating Environment
      Constant temperature workshop (20\u00b11\u2103): Prioritize Grade 000\/00 Jinan Blue granite to fully leverage low thermal expansion advantages;
      Ordinary workshop with large temperature fluctuations: Grade 000 is not recommended; choose Grade 00 with a thickened base to reduce thermal deformation;
      Presence of cutting fluids and coolants: 316 stainless steel inserts overall anti-seepage glazing, with thickened slabs;
      Optical \/ semiconductor non-magnetic requirements: Granite is naturally non-magnetic, no extra treatment needed;
      Heavy-duty continuous cutting: M12 inserts, thickness \u2265200mm, high rigidity and vibration damping to suppress resonance.
      VII. Step 7: Manufacturer Process Acceptance Standards (Key to avoiding pitfalls)
      Confirm the manufacturer possesses the following processes before ordering, otherwise the threaded insert base is highly prone to precision failure:
      Raw material natural aging treatment, no splicing, no cracks, no air bubbles;
      Overall constant-temperature grinding after pre-embedding inserts, rather than block-by-block processing;
      Factory-issued laser interferometer flatness test report and hole position precision test data;
      Diamond water-cooled drilling process, as dry drilling causes micro-cracks inside the stone.<\/li>\n<\/ol>\n\n\n\n
      \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

      Complete Selection Guide for High-Precision Granite Machine Tool Bases with Threaded InsertsFollow the 7-step screening process: Application Scenario \u2192 Material \u2192 Precision \u2192 Dimensions & Thickness \u2192 Threaded Insert Configuration \u2192 Supporting Structure \u2192 Manufacturer Process to avoid common pitfalls such as hole deformation, insert detachment, insufficient precision, and inadequate rigidity in one go.I. Step…<\/p>","protected":false},"author":1,"featured_media":3006,"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-3004","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\/06\/20260605-150630.png",600,450,false],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/fr\/author\/jtlcnc\/"},"comment_info":0,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":311,"filter":"raw","cat_ID":35,"category_count":311,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/3004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/comments?post=3004"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/3004\/revisions"}],"predecessor-version":[{"id":3007,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/3004\/revisions\/3007"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/3006"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=3004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=3004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=3004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}