{"id":2910,"date":"2026-06-11T09:07:20","date_gmt":"2026-06-11T01:07:20","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=2910"},"modified":"2026-06-11T09:07:21","modified_gmt":"2026-06-11T01:07:21","slug":"how-to-choose-a-suitable-granite-base-cmm","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/ru\/2026\/06\/11\/how-to-choose-a-suitable-granite-base-cmm\/","title":{"rendered":"\u041a\u0430\u043a \u0432\u044b\u0431\u0440\u0430\u0442\u044c \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0449\u0443\u044e \u043a\u043e\u043e\u0440\u0434\u0438\u043d\u0430\u0442\u043d\u043e-\u0438\u0437\u043c\u0435\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u0443\u044e \u043c\u0430\u0448\u0438\u043d\u0443 \u0441 \u0433\u0440\u0430\u043d\u0438\u0442\u043d\u044b\u043c \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u0435\u043c?"},"content":{"rendered":"

I. First Step: Determine Granite Base Material and Grade (Most Critical)
1) Stone Types (From High to Low)
Indian Black (M10) \/ Imported Black Granite: High density, lowest thermal expansion coefficient, best stability, used for high-precision \/ laboratory-grade CMMs (aerospace, medical, optics).
Jinan Green: Top domestic grade, good rigidity and vibration absorption, first choice for mid-to-high-end bridge machines; relatively expensive.
Zhangqiu Black (Sesame Black): King of cost-performance, most commonly used for ordinary molds, auto parts, and workshop-type CMMs.
Northeast Sesame White: Average stability, only used for low-precision, economical equipment.
\u274c Pitfall Avoidance: Do not buy “dyed granite” or “synthetic marble”; they deform, fade, and lose precision significantly after 1\u20132 years of use.
2) Precision Grade (Flatness)
000 Grade (Ultra-high precision): \u22642\u03bcm\/m, used in laboratories and metrology rooms.
00 Grade (Industrial standard): \u22644\u20135\u03bcm\/m, standard configuration for the vast majority of CMMs.
0 Grade: \u226410\u03bcm\/m, only used for rough measurements and economical machines.
3) Granite Base Requirements
Monolithic Structure (Non-assembled): Base Y-axis guide rail worktable must be from the same block of material, with no assembly stress.
Natural Aging \u2265 2 Years: Internal stress fully released to avoid later deformation.
Surface Grinding Ra\u22640.4\u03bcm: Guide rail and worktable surfaces must be mirror-grade.
II. Select Structure: Moving Bridge vs. Fixed Bridge (Different Granite Applications)
1) Moving Bridge (Most Common, Recommended)
The worktable is a massive granite block, fixed in place; the bridge moves in the Y-direction.
Advantages: High load capacity, stable, good vibration resistance, convenient workpiece loading\/unloading; first choice for molds, auto parts, and 3C products.
Granite: Integrated base worktable Y-axis guide rail, thickness 150\u2013300mm.<\/p>\n\n\n\n

Moving Bridge CMM
2) Fixed Bridge (High Precision)
The bridge is fixed, and the granite worktable moves in the Y-direction.
Advantages: Extremely high rigidity, highest precision (up to 0.5\u03bcm level); aerospace, medical, optics.
Disadvantages: Limited travel, slightly lower load capacity, high price.<\/p>\n\n\n\n

Fixed Bridge CMM
3) Gantry Type (Large Workpieces)
Large monolithic granite base, equipped with cast iron or steel crossbeams; used for automotive body panels and large aerospace components.<\/p>\n\n\n\n

Gantry CMM
III. Reverse Selection Based on “Precision Requirements” (Most Practical)
1) Ultra-high Precision (Within \u00b11\u03bcm)
Scenarios: Aircraft engines, optical lenses, medical implants
Configuration: Fixed bridge Indian Black \/ Jinan Green 000 grade air bearing guide rails constant temperature 20\u00b10.5\u2103.
2) Mid-to-high Precision (\u00b12\u20133\u03bcm)
Scenarios: Precision molds, automotive transmissions, 3C molds
Configuration: Moving bridge Jinan Green \/ Zhangqiu Black 00 grade air bearing guide rails workshop air conditioning.
3) Ordinary Precision (\u00b15\u03bcm)
Scenarios: Machined parts, stamped parts, workshop spot checks
Configuration: Moving bridge Zhangqiu Black 00 grade linear guide rails ordinary environment.
Empirical Formula: CMM precision \u2248 1\/3 to 1\/5 of the workpiece tolerance.<\/p>\n\n\n\n

IV. Travel and Load Capacity: Granite base must be “large and thick enough”
X\/Y\/Z Travel: Based on maximum workpiece size 100\u2013200mm margin; e.g., for a 500\u00d7400\u00d7300 workpiece, select a 700\u00d7600\u00d7500 machine model.
Worktable Load Capacity: Granite base load capacity \u2265 (workpiece fixture total weight) \u00d7 1.5; Common: 500kg, 1000kg, 2000kg.
Base Thickness:
Small machines (below 700): \u2265150mm
Medium machines (around 1000): \u2265200mm
Large machines: \u2265250\u2013300mm
V. Environmental Adaptation: Granite advantages must match the site
High vibration (workshop, with overhead cranes): Must use granite air-bearing guideways independent vibration-proof foundation; shock absorption is 3\u20135 times stronger than cast iron.
Large temperature fluctuations (no constant temperature): Select Jinan Blue \/ Indian Black (thermal expansion coefficient \u2248 6.5\u00d710\u207b\u2076\/\u2103), much more stable than cast iron.
Humid \/ with cutting fluid: Granite does not rust, is acid and alkali resistant, and is easier to maintain than cast iron.
VI. Budget Range Reference (2026 market price, domestic)
Economic type (\u00b15\u03bcm): Moving bridge Zhangqiu Black Grade 00, 150,000\u2013250,000
Mid-to-high end (\u00b12\u20133\u03bcm): Moving bridge Jinan Blue Grade 00 air-bearing, 300,000\u2013500,000
High precision (\u00b11\u03bcm): Fixed bridge Indian Black Grade 000, 600,000\u20131,000,000
VII. Quick Selection Checklist (Directly check off)
\u2705 Granite: Monolithic, natural aging \u2265 2 years, Grade 00 and above
\u2705 Stone material: Precision \u2192 Indian Black \/ Jinan Blue; Standard \u2192 Zhangqiu Black
\u2705 Structure: Mold \/ Auto parts \u2192 Moving bridge; Aerospace \/ Medical \u2192 Fixed bridge
\u2705 Travel: Workpiece size 100\u2013200mm
\u2705 Load capacity: \u2265 (workpiece fixture) \u00d7 1.5
\u2705 Guideways: High precision \u2192 Air-bearing; Standard \u2192 Linear guideways<\/p>\n\n\n\n

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

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