Must: Rough grinding \u2192 Fine grinding \u2192 Precision grinding \u2192 Polishing \/ Mirror grinding (High-precision platforms prohibit flame treatment, litchi surface)<\/li>\n\n\n\n
Common Grades (by working surface size):
Grade 000: \u22641.5 \u03bcm \/ 300mm (Ultra-high precision CMM)
Grade 00: \u22643 \u03bcm \/ 300mm (General high precision)
Grade 0: \u22646 \u03bcm \/ 300mm (Ordinary precision)
Flatness within any 250\u00d7250mm area shall not exceed half of the overall tolerance<\/li>\n\n\n\n
Working surface: Ra \u2264 0.4 \u03bcm (0.2\u20130.4 \u03bcm optimal)
Non-working surface \/ Side: Ra \u2264 6.3\u201312.5 \u03bcm<\/li>\n\n\n\n
Working surface: No scratches, no impact marks, no rust, no pits, no discoloration
Gloss: Precision ground surface presents uniform matte \/ mirror finish, no local high\/low gloss<\/li>\n<\/ol>\n\n\n\n
III. Edge and Hole Processing (Essential for guides \/ platforms)
Corners: C0.5\u2013C2 chamfer, no chipping, no burrs
Side perpendicularity: \u22640.02 mm\/m (Grade 00)
Threaded holes \/ Mounting holes:
Hole spacing tolerance: \u00b10.1 mm
No chipping at hole openings, threads pass go\/no-go gauges<\/p>\n\n\n\n
IV. Non-working Surface Treatment
Back \/ Sides: Rough grinding or sandblasting, flat without large unevenness, minor repairs allowed
Bottom: Flatness of the mounting bottom \u22640.1 mm\/m, ensuring contact with supports<\/p>\n\n\n\n
V. Inspection Standards (Can be included in contract)
Flatness: Electronic level \/ Laser interferometer, grid method \/ diagonal method inspection
Roughness: Surface roughness tester
Appearance: Visual inspection under strong light tactile check for no unevenness<\/p>\n\n\n\n
VI. Summary (For customers \/ Quotations) I. Basic Material Requirements (Ensure the stone itself first)Stone: Jinan Green (G3701), Zhangqiu Black, or equivalent high-density fine-grain graniteDensity: \u22653.0 g\/cm\u00b3 (High-precision platform \u22653.2)Water Absorption: \u22640.25% (Precision grade \u22640.05%)Hardness: Mohs hardness \u22656, working surface \u226570HSStructure: Crack-free, no sand holes, no slag inclusions, no weathering layer, biotite content <5% II. Working Surface Processing (Most critical, applicable…<\/p>","protected":false},"author":1,"featured_media":2520,"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-2517","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\/04\/\u5fae\u4fe1\u56fe\u7247_20260420155319_96_25.png",582,906,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":158,"filter":"raw","cat_ID":35,"category_count":158,"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\/2517","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=2517"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2517\/revisions"}],"predecessor-version":[{"id":2521,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2517\/revisions\/2521"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/2520"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=2517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=2517"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=2517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Adopts Jinan Green high-density granite, with working surface processed by constant-temperature precision grinding. Flatness reaches Grade 00 (\u22643\u03bcm\/300mm), roughness Ra\u22640.4\u03bcm. Crack-free and sand-hole-free, with smooth chamfered edges. Features stable precision, wear resistance, and deformation resistance.<\/p>\n\n\n\n![\"\"](\"https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/03\/\u6784\u4ef61-768x1024.jpg\")
<\/figure>","protected":false},"excerpt":{"rendered":"