{"id":2137,"date":"2026-03-17T08:21:33","date_gmt":"2026-03-17T00:21:33","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=2137"},"modified":"2026-03-17T08:21:34","modified_gmt":"2026-03-17T00:21:34","slug":"limitations-and-challenges-of-granite","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/ar\/2026\/03\/17\/limitations-and-challenges-of-granite\/","title":{"rendered":"\u062d\u062f\u0648\u062f \u0648\u062a\u062d\u062f\u064a\u0627\u062a \u0627\u0644\u062c\u0631\u0627\u0646\u064a\u062a"},"content":{"rendered":"

Limitations and Challenges: Granite is not Flawless<\/p>\n\n\n\n

Although granite is an ideal material fthe bases of ultra-precision equipment, it still possesses certain inherent limitations that require attention during selection and use:<\/p>\n\n\n\n

Brittleness and Poor Impact Resistance
Granite’s high hardness coexiith its brittleness \u2014 its fracture toughness is only 0.5\u20131.0 MPa\u00b7m\u00b9\/\u00b2, approximately 1\/10 that of cast iroresulting in weak impact resistance. When struck by sharp heavy objects (such as metal tools or workpieces) or subjected to local stress concentration, it is prone to chipping, ing, or even complete damage. Once damaged, it cannot be repaired and the entire component must be replaced.<\/p>\n\n\n\n

Solutions:
Structural Optimization: Adopt hollow or ribbed designs to disperse l stress and reduce chipping risk while maintaining rigidity \u2014 for example, designing large platform edges with rounded corners to avoid stress concentration.
Protective Measures: Apply polyethylene film or epoxy re coatings to the base surface to prevent direct contact with sharp objects; install anti-collision barriers around the equipment to prevent impacts from personnel or other equipment.
Handling Standards: Use specialized ling tools to ensure uniform force distribution and avoid local overloading; use foam cushioning materials and wooden crates during long-distance transport to prevent hidden cracks caused by bumps.<\/p>\n\n\n\n

Weight and Installation Requiments
With a density of 2.6\u20133.07 g\/cm\u00b3, large platforms (e.g., 4m\u00d73m) can weigh ons, imposing high requirements on the load-bearing capacity of the installation floor \u2014 typically requiring a floor load of \u22652000 kg\/m\u00b2; otherwise, floor settlement may occur, aing the flatness of the base.<\/p>\n\n\n\n

Solutions:
Lightweight Design: Adopt a granite-aluminum alloy honeycomb composite structure \u2014 filling the area below the granite reference surface with an aluminumoy honeycomb core can reduce overall weight by about 40% while maintaining rigidity and retaining granite’s high-precision characteristics.
Support Structure Optimization: Use three-point or multi-point supt designs to ensure uniform force distribution on the base \u2014 for example, the granite base of a Wenzel measuring machine uses six-point support with a load error of \u22645 effectively avoiding deformation caused by local overloading.
Floor Pre-treatment: Reinforce the installation floor (e.g., by laying a reinforced concrete bedding layer) to ensure the floorequirements; after installation, allow a 12-hour settling period before calibration to ensure the base is fully stabilized.<\/p>\n\n\n\n

The Double-Edged Sword of Low Thermal Conduvity
Granite’s thermal conductivity is only 1\u20133 W\/mK, approximately 1\/20 to 1\/50 that of cast iron. This characteristic is both anvantage \u2014 it effectively suppresses deformation caused by local temperature fluctuations and makes the temperature distribution of the base more uniform; and a disadvantage \u2014 if heat generated by the equipment itself ( from motors or guides) accumulates in the base over time, it can cause slow thermal expansion, affecting precision.<\/p>\n\n\n\n

Solutions:
Thermal Management Design: Design heat conduction channelide the base, filled with thermally conductive silicone or copper tubes, to guide heat to external radiators; or install a water cooling system beneath the base to actively control temperature, ing the base temperature matches the ambient temperature.
Material Matching: Use materials with a thermal expansion coefficient similar to that of granite (such as ceramics) for the equipment’s moving e.g., guides, motors) to reduce assembly stress and deformation caused by differences in thermal expansion coefficients.<\/p>\n\n\n\n

Cost and Processing Cycle
The initial procurement cost and processing cycle of granite are both higher than those of traditional metal materials:
Cost: Thof a granite platform is typically 30% to 50% higher than that of a cast iron platform; the price of large-scale high-precision platforms(such as 6m\u00d72m) can reach hundreds of thousands of yuan, far exceeding that of cast iron platforms;
Processing Cycle: Processing granite requires diamond tools and precision grinding equipment, with a typical cycle of 2 to 4 weeks, which is shorter than the 45 to 60 days for cast iron platforms but longer than the 5 to 7 days focial granite.<\/p>\n\n\n\n

Solutions:
Optimized Selection: Choose suitable granite varieties based on equipment precision requirements \u2014 the performance of high-quality granites such as Jinan Qing and shan Qing is optimal but comes at a higher price; varieties like Zhangqiu Black and Fujian Black have slightly lower performance but are about 20% cheaper, meeting the requiremenof medium-to-high precision equipment;
Process Optimization: Adopt 5-axis linkage processing equipment and precision grinding processes to control processing errors within a very small range, while reducing manual intervention and she processing cycle \u2014 for example, using CNC grinding equipment can reduce the processing cycle of a 1m\u00d71m platform from 7 day.<\/p>\n\n\n\n

Relying on its uniform crystal structure and extremely low internal stress formed by geological processes over hundreds of millioars, natural granite has become the ideal material for the bases of ultra-precision equipment. Its core advantages\u2014low coefficient of thermal expansion, high damping vibration reduction capability, excellent dimensional st, and strong chemical inertness\u2014are irreplaceable by traditional metal materials and new engineering materials, serving as the cornerstone of the ultra-precision manufacturing and inspection fields.<\/p>\n\n\n\n

The core valuf granite as a base material for precision equipment lies in its ability to maintain the precision and stability of reference surfaces over the long term under the extreme requirements of ultra-precision fields:<\/p>\n\n\n\n

Physicalroperties: A low coefficient of thermal expansion effectively suppresses deformation caused by temperature fluctuations; high damping capability rapidly attenuates vibrations; high hardness and wear resistance ensure long-term precision retention; and hic stiffness guarantees resistance to deformation under heavy loads.<\/p>\n\n\n\n

Chemical Properties: Strong chemical inertness makes it suitable for special scenarios such as semiconductor and chemical laboratories; its non-magn and non-conductive characteristics avoid interference with inspection signals.<\/p>\n\n\n\n

Engineering Value: In fields such as semiconductor inspection, coordinate measuring machines, and optical imaging measurement, granite bases can significantly improve equipment precisand repeatability, reduce maintenance costs, and extend calibration cycles, ultimately enhancing the economic benefits of the entire lifecycle. For example, after a metrology institute adopted granite components, the calibon cycle was extended from six months to two years, and maintenance costs were reduced by 60%.<\/p>\n\n\n\n

Selection Recommendations<\/p>\n\n\n\n

To maximize the performance advantages of granite bases, scientific selection she made based on equipment precision requirements, usage scenarios, and budget:<\/p>\n\n\n\n

Precision Requirement Matching:
Nanometer-level precision equipment (e.g., EUV lithography machines, atomic force mpes): Select high-quality granite such as Jinan Qing or Mount Tai Qing, with a precision grade of 000 and flatness error \u22640.1mm\/m;
Sub-micron-level precision equipment (e.g., coordinate measuring machines, wafer inspection machines): Select granite such as Jinan Qing or Zhangqiu Black, with a precison grade of 00 and flatness error \u22640.002mm\/m;
Micron-level precision equipment (e.g., general optical measuring instruments, industrial microscopes): Select nite such as Fujian Black or Northeast Sesame White, with a precision grade of 0 and flatness error \u22640.01mm\/m.<\/p>\n\n\n\n

Usage Scenario Adaptation:
Semico lithography workshops: Select dark granite (e.g., Jinan Qing), which offers stronger corrosion resistance and does not reflect light to interfere with lithography systems;
Coasenvironments: Select granite with a density \u22652.7g\/cm\u00b3, which offers superior resistance to salt spray and acid-base corrosion;
Magnetic inspection laboratories: Must select etic granite (e.g., Jinan Qing) to avoid interference with magnetic measurement equipment.<\/p>\n\n\n\n

Installation and Maintenance Standards:
Installation: Leveling should be performed by a professional team using thint or multi-point support designs to ensure uniform force distribution; after installation, the base should be left undisturbed for 12 hours to stabilize completely before calibration;
Maintenance: Reglean surface dust with a soft brush; wipe oil stains with neutral cleaning agents (such as alcohol or acetone); avoid using corrosive solvents; prevent impact from sharp heavcts to avoid chipping or cracking.<\/p>\n\n\n\n

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Limitations and Challenges: Granite is not Flawless Although granite is an ideal material fthe bases of ultra-precision equipment, it still possesses certain inherent limitations that require attention during selection and use: Brittleness and Poor Impact ResistanceGranite’s high hardness coexiith its brittleness \u2014 its fracture toughness is only 0.5\u20131.0 MPa\u00b7m\u00b9\/\u00b2, approximately 1\/10 that of cast iroresulting…<\/p>","protected":false},"author":1,"featured_media":2140,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_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-2137","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\/03\/\u5fae\u4fe1\u56fe\u7247_20260311091539_3_11.jpg",800,800,false],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/ar\/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":119,"filter":"raw","cat_ID":35,"category_count":119,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts\/2137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/comments?post=2137"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts\/2137\/revisions"}],"predecessor-version":[{"id":2141,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts\/2137\/revisions\/2141"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/media\/2140"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/media?parent=2137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/categories?post=2137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/tags?post=2137"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}