Formula: Flatness deviation = Grade coefficient \u00d7 (1 diagonal mm\/1000) \u03bcm
Grade 000 (Semiconductor \/ Metrology Lab CMM): 1 \u00d7 (1 D\/1000) \u03bcm
Grade 00 (Aerospace, Automotive, General High-precision CMM): 2 \u00d7 (1 D\/1000) \u03bcm
Example: For a 2000\u00d71200mm base, the diagonal is \u22482332mm
Total flatness error for Grade 00 \u2264 2 \u00d7 (1 2332\/1000) = 6.664\u03bcm<\/li>\n\n\n\n
Parallelism of working surface and bottom surface: \u22640.002mm\/1000mm
Perpendicularity of side edges (Guide rail installation reference): \u22640.0015mm\/1000mm
Straightness of guide rail grooves: \u22640.001mm\/1000mm
Position accuracy of mounting threaded holes: \u00b10.008mm, hole position H7 precision tolerance
Load deflection: Maximum bending deformation under full rated load <2\u03bcm<\/li>\n\n\n\n
Measuring working surface: Mirror-polished Ra \u22640.008\u03bcm, with no fine scratches or pits
Side and bottom surfaces: Precision-ground Ra \u22640.63\u03bcm
Meets Class 100 cleanroom low-dust standards, not easily adsorbing metal chips
III. Multi-stage Stress Relief Process (Determining long-term accuracy stability)
Bases without sufficient aging will inevitably experience accuracy drift after six months of use; the complete aging process is:
Natural static rough aging: Raw blocks are left outdoors for \u226590 days after cutting to release original geological stresses
Thermal cycling aging: 20 repeated cycles from -5\u2103 to 40\u2103 to offset thermal stresses
Low-frequency vibration aging: The whole machine is vibrated for 30 minutes after rough machining to eliminate internal stresses from cutting
Constant temperature stable resting: Resting in a 21\u2103 constant temperature workshop for 72 hours before precision machining, then proceeding to the grinding process
Delivery includes a stress release test report to avoid the risk of reference deformation during the first 1\u20132 years of customer use
<\/li>\n<\/ol>\n\n\n\n
IV. Technical Requirements for Integrated Structure Machining I. Hard Technical Specifications for Substrate Material (Mandatory for High-end CMM)Select semiconductor-grade dense gabbro (Jinan Green \/ Indian Black Granite); ordinary porous stone is strictly prohibited:Coefficient of Thermal Expansion (CTE): 2.5\u20133.8\u00d710\u207b\u2076\/\u2103, only 1\/4 of steel and 1\/6 of aluminum alloy; deformation of a 1m base per 1\u2103 temperature difference \u22640.4\u03bcm, eliminating measurement drift caused by…<\/p>","protected":false},"author":1,"featured_media":3125,"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-3124","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\/07\/\u5fae\u4fe1\u56fe\u7247_20260717103939_77_25.png",845,795,false],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/es\/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":310,"filter":"raw","cat_ID":35,"category_count":310,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts\/3124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/comments?post=3124"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts\/3124\/revisions"}],"predecessor-version":[{"id":3126,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts\/3124\/revisions\/3126"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/media\/3125"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/media?parent=3124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/categories?post=3124"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/tags?post=3124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
One-piece Integrated Forming
Milling and grinding of guide rail mounting slots, T-slots, water-cooled embedded channels, locating counterbores, and precision threaded holes in a single process; the entire machine shares a single granite reference base to eliminate cumulative assembly errors of multiple parts.
Thickness-to-Rigidity Ratio
Standard thickness ratio: For every 1000mm of length, the base thickness \u2265120mm; for large gantry CMM bases, thickness \u2265300mm to ensure heavy-load bending rigidity.
Support Structure Reservation
Reserved adjustable support block mounting positions at the bottom, six-point balanced support design, verified by finite element simulation to ensure no local stress concentration; matching anti-vibration air spring mounting reference surfaces.
Edge Protection
R2~R3 radius chamfering on the working surface edges to prevent chipping from collisions and scratching of probes and workpieces.
V. Surface Cleaning and Anti-corrosion Treatment (Suitable for Workshops \/ Cleanrooms)
Vacuum Resin Sealing: High-temperature vacuum impregnation to seal stone micropores, preventing water vapor and oil from penetrating the interior, and ensuring no particle dust precipitation.
Chemical Resistance: Resistant to long-term spraying of weak acid\/alkaline cutting fluids, isopropyl alcohol, and photoresist strippers; the surface will not powderize or discolor.
Optional Anti-static Coating: Semiconductor inspection models can add an anti-static coating to avoid electrostatic breakdown of precision probes.
VI. Vibration Damping and Thermal Stability Supporting Technical Requirements
Material Native Vibration Damping: Internal damping of granite crystals can attenuate low-frequency vibrations (10~1000Hz) from fans, vacuum pumps, and overhead cranes.
Optional Built-in Temperature Control Channels: Micro-fluid cooling channels embedded in large CMM bases, connected to an external \u00b10.01\u2103 water chiller to balance the temperature field and eliminate local motor heat deformation.
Multi-point Temperature Measurement Embedded Holes: Reserved temperature sensor mounting holes to collect real-time base temperature gradients, working with equipment software for nanometer-level thermal drift compensation.
VII. Factory Acceptance and Documentation Requirements (Essential for Iraq Export)
Each base is accompanied by a full set of traceable certificates for Iraq import customs clearance and complete machine acceptance:
CMM full-size accuracy inspection report (original data for flatness, parallelism, and perpendicularity)
Granite material certificate and third-party test certificate for the coefficient of thermal expansion
Vibration damping and non-magnetic test reports
DIN876 00\/000 grade accuracy verification certificate (English version)
On-site workshop photos and video footage of the machining, timing, and grinding processes
VIII. Operating Environment Adaptation Technical Requirements
Standard Operating Environment: Temperature 20\u00b12\u2103, humidity 40%~60%; can withstand short-term workshop temperature fluctuations of \u00b15\u2103.
Ground Disturbance Resistance: When paired with air spring isolation mounts, the vibration transmission rate is \u2264-20dB, meeting the CMM vibration limit of <10\u03bcm\/s.
All-weather Stability: Supports 24h continuous year-round operation, extending the annual calibration cycle to 3~5 years, significantly reducing customer operation and maintenance costs.
IX. Technical Advantages Compared to Cast Iron \/ Aluminum Bases (Key Follow-up Points for Quotations)
Cast Iron: High thermal expansion, magnetic, 2~3 years of creep deformation, only suitable for rough measurements in ordinary workshops.
Aluminum Alloy: CTE is 6 times that of granite; even a tiny temperature difference causes micron-level drift, making it unsuitable for high-precision CMMs.
Summary of Comprehensive Advantages of Granite Bases (Can be directly quoted in follow-up emails)
Low thermal expansion, minimal measurement error due to temperature changes;
High damping vibration reduction, eliminating data fluctuations caused by vibration;
Non-magnetic insulation, protecting precision optical \/ electronic probes;
Ten-year dimensional stability, extremely low later-stage calibration and replacement costs, offering higher long-term cost-effectiveness.<\/p>\n\n\n\n![\"\"](\"https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/07\/\u5fae\u4fe1\u56fe\u7247_20260717103939_77_25.png\")
<\/figure>","protected":false},"excerpt":{"rendered":"