{"id":2202,"date":"2026-03-25T08:14:22","date_gmt":"2026-03-25T00:14:22","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=2202"},"modified":"2026-03-25T08:14:23","modified_gmt":"2026-03-25T00:14:23","slug":"why-precision-granite-surface-plates-are-crucial","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/fr\/2026\/03\/25\/why-precision-granite-surface-plates-are-crucial\/","title":{"rendered":"Pourquoi les plaques de surface en granit de haute pr\u00e9cision sont-elles indispensables ?"},"content":{"rendered":"

In precision measurement, precision machining, and semiconductor and optical equipment, a precision granite surface plate is not merely “a piece of stone,” but the precision reference and physical foundation of the entire device. Its importance can be summarized in one sentence: Platform precision \u2248 Final equipment precision; Unstable platform \u2248 Zero overall equipment precision.<\/p>\n\n\n\n

I. It is the “Reference Surface” for all precision
The precision of almost all precision equipment is measuredtive to this platform:
Coordinate Measuring Machines (CMM)
Vision Measuring Machines, Projectors
Lithography Machines, Bonding Machines, Dispensing Machines
Precision Grindingchines, Lathes, Inspection Platforms
Granite platforms serve as:
The reference for workpiece placement
The reference for guide rail motion
The reference for the coordinate system origin
If tence surface is uneven, unstable, or deformed, all subsequent measurements, movements, and machining will be incorrect.
It is like building a high-rise on soft ground; if the fodation tilts, the entire building tilts.<\/p>\n\n\n\n

II. Only granite can simultaneously meet the four major “precision necessities”
This is something other materials (cast iron, aluminum alloy, ordnary marble) cannot achieve:<\/p>\n\n\n\n

    \n
  1. Extremely strong thermal stability \u2014 Precision does not collapse with temperature changes
    Thermal expansion coefficient is only 1\/3 to 1\/4 tat of steel
    With environmental temperature fluctuations of 2-3\u00b0C, metal platforms deform noticeably, while granite remains almost unchanged
    For instruments, this means:
    High precision can be maintained without strictture control; it is accurate upon startup and does not require repeated calibration.<\/li>\n\n\n\n
  2. Complete release of internal stress \u2014 No long-term deformation
    Natural granite, after hundreds of millionsf geological action, has completely released internal stress:
    No warping
    No twisting
    No slow deformation over time
    Even with aging treatment, metal beds will undergo slight deformation after few years;
    Granite can maintain basic precision for ten to twenty years.<\/li>\n\n\n\n
  3. High rigidity High damping \u2014 Anti-vibration and anti-interference
    High density and rigiit resistant to deformation under force
    Large internal crystal structure damping provides far superior vibration reduction compared to cast iron
    Machine tool vibrations in the workshop, personnel movement, and fan vibrations ickly attenuate when transmitted to the granite platform.
    For precision equipment:
    Less vibration = Accurate measurement, bright machining, and high yield.<\/li>\n\n\n\n
  4. Rust-proof, non-magnetic,tenance-free
    Does not rust, so no need for oil coating to prevent rust
    Non-magnetic, does not interfere with sensors, gratings, or probes
    High hardness, wer-resistant, almost no wear
    Long-term use will not cause precision drift due to rust, wear, or magnetization.<\/li>\n<\/ol>\n\n\n\n

    III. Surface precision directly determines the highest precision the equipment ve
    Precision granite platforms are not just “a little flat is enough,” but:
    Flatness can reach 0.1\u03bcm\uff5e1\u03bcm\/m
    Surface roughness can mirror-like Ra 0.02\u03bcm level
    This directly determines:
    Whether air-bearing guides can run smoothly
    An uneven surface causes air bearings to vibrate and pressure fluctuatiotly reducing positioning accuracy.
    The quality of measurement repeatability
    If the workpiece has the same posture every time it is placed, repeatability is good.
    Whether high-preci sensors can function normally
    Laser interferometers, linear encoders, and CCD vision systems all depend on a stable and flat reference.
    In short:
    Platform precision is the ceiling of equipme precision.
    If the platform cannot achieve 0.5\u03bcm level, the entire machine cannot achieve sub-micron level.<\/p>\n\n\n\n

    IV. Without it, high-end precision equipment is simpl impossible
    These fields must rely on precision granite platforms:
    Semiconductor packaging, lithography machine stages
    CMMs, high-precision inspection equipment
    Optical experiments, laserng
    Precision automation, micro-assembly equipment
    Once the platform is omitted or standards are lowered:
    Measurement data becomes unreliable
    Machined dimensions exceed tolerances
    Yield decrea calibration and rework
    Equipment life is drastically shortened
    Saving money on the platform will result in multiple losses in scrap, rework, downtime, and calibration in end.<\/p>\n\n\n\n

    Summarize in the most critical sentence: The precision granite surface plate is the “precision heart” and “physical foundation” of precision equipment. It determines ty, stability, and durability of the equipment, serving as the fundamental guarantee for all high precision.<\/p>\n\n\n\n

    \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

    Dans les domaines de la m\u00e9trologie de pr\u00e9cision, de l\u2019usinage de pr\u00e9cision, ainsi que des \u00e9quipements optiques et \u00e0 semi-conducteurs, une plaque de pr\u00e9cision en granit n\u2019est pas simplement \u201c un morceau de pierre \u201d, mais la r\u00e9f\u00e9rence de pr\u00e9cision et le fondement physique de l\u2019ensemble du dispositif. Son importance peut se r\u00e9sumer en une phrase : Pr\u00e9cision de la plate-forme \u2248 Pr\u00e9cision finale de l\u2019\u00e9quipement ; Plate-forme instable \u2248 Pr\u00e9cision globale de l\u2019\u00e9quipement nulle. I\u2026.<\/p>","protected":false},"author":1,"featured_media":1221,"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":"none","_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":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_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-2202","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\/01\/\u5927\u7406\u77f3\u5e73\u53f0-1024x768.jpg",1024,768,true],"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\/2202","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=2202"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2202\/revisions"}],"predecessor-version":[{"id":2205,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2202\/revisions\/2205"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/1221"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=2202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=2202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=2202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}