urrent Industrial Application Status of Granite Reference Components for CMM Inspection in High-End Machinery

   With domestic production of high-end equipment and widespread micron-level precision machining, CMMs are core devices for 3D dimension and geometric tolerance testing. The material performance of their datum bases directly determines measurement reliability. Cast iron and cast aluminum bases suffer severe thermal deformation, vibration interference and long-term stress shift, unable to meet ultra-precision testing standards for semiconductors, aerospace and new energy parts. High-density granite datums feature low thermal expansion, strong vibration damping, wear resistance, non-magnetism and decades-long dimensional stability, becoming standard supporting bases for premium CMMs with rising market share. This article analyzes the application status, technical trends and standardized selection of granite CMM datums based on UNPARALLELED Group's full-chain manufacturing advantages, combined with market layout, downstream demands and industry bottlenecks.
1. Market Layout: Accelerated Local Substitution & Surging High-End Demand
   The domestic precision granite measuring tool market keeps growing, with CMM supporting granite plates, bases and air-float platforms as core growth segments.
   Low-end general machinery: Small factories adopt cheap cast iron or low-density stone platforms only for rough millimeter-level measurement, with poor precision stability and frequent calibration.
   Mid-to-high-end precision manufacturing: New energy vehicle three-electric parts, aerospace structures, semiconductor packaging and optical component testing lines widely use granite datums. The domestic occupancy rate of high-end CMM granite bases hit 57% in 2025.
German and Italian stone brands once dominated the global high-precision measurement market. UNPARALLELED and other domestic leaders break this monopoly with self-developed high-density black granite, complete aging stress relief processes and calibration standards compatible with DIN, ASME, JIS and GB. Our products are supplied to top CMM manufacturers worldwide and exported to Europe, America and Southeast Asia.
   2. Downstream Industry Application
   Semiconductor Precision Testing
   As chips advance to 2–3nm processes, wafer and lithography component testing requires nanometer-level stable datums. SEMI standards demand cumulative thermal deformation ≤0.3μm after 72 hours of continuous operation. UNPARALLELED® black granite has a stable density of 3100kg/m³ and thermal expansion coefficient of 4.6×10⁻⁶/℃, superior to metal. Non-magnetic and resistant to cleanroom chemical vapors, it is the top choice for semiconductor fabs.
   Large Aerospace Component Testing
  Aircraft structural parts and engine blades over 3 meters long require bases with high rigidity and long-term flatness retention. Large metal platforms deform under self-weight and temperature changes. Integrally formed granite bases have no splicing stress and maintain fixed geometry for decades after multi-stage aging, suitable for large gantry CMM continuous testing.
   New Energy Vehicle Three-Electric Parts Testing
  Automatic mass testing lines generate constant high-frequency micro-vibrations from machine tools and overhead cranes. Granite's dense crystal structure absorbs over 90% external vibration to avoid unstable CMM readings. It also resists erosion from cutting fluid and lubricants, adapting to complex workshop environments.
   Calibration for Third-Party Metrology Labs
    Metrology institutions require traceable official calibration reports. All UNPARALLELED granite datums are fully scanned and calibrated by UK Renishaw laser interferometers, with bilingual Chinese-English reports traceable to national metrology institutes worldwide, meeting mandatory laboratory inspection standards.
3. Main Industry Pain Points
   Uneven manufacturing standards: Small workshops use low-quality stone and skip aging procedures. Products warp and lose precision within 1–3 years, causing mass defective parts.
   Limited large-size high-precision customization capacity: Few manufacturers can produce 20-meter integrated granite bases for large gantry and semiconductor CMMs.
   Lack of standardized selection awareness: Buyers only focus on low prices while ignoring thermal expansion, aging treatment, hardness and calibration traceability, mistakenly choosing inferior light stone or mineral casting bases.
4. UNPARALLELED Group's Solutions
   As the only manufacturer with complete ISO three-system & CE certifications that mass-produces granite, mineral casting, precision ceramic and carbon fiber beam ultra-precision substrates, UNPARALLELED owns two 200,000㎡ production bases, a 20,000㎡ raw stone storage yard and a 10,000㎡ constant-temperature dust-free workshop.
Strict raw material control: Specially selected black granite with 24-month open-air natural aging, full ultrasonic, density and thermal expansion testing with traceable reports.
   Three-stage aging process: Long blank natural aging + thermal cycle rough machining aging + constant-temperature secondary aging after semi-finishing, eliminating residual cutting and grinding stress to avoid long-term deformation.
Ultra-precision processing & full-range calibration: Four USD 500,000+ large CNC grinders for 20-meter, 100-ton integrated bases. Craftsmen with 30+ years experience achieve Ra0.02μm surface smoothness. All products adopt Renishaw laser interferometer full-grid calibration with internationally accepted reports for export without secondary inspection.
One-stop customized service: Custom T-slots, embedded threaded holes and air-float grooves according to CMM size, load, precision and workshop conditions. 24-hour multilingual technical support, 2-week delivery, full pre-sales calculation, on-site leveling and after-sales calibration service.
   5. Future Industry Trends
   Rising demand for large, seamless, Class 000 ultra-precision integrated granite bases; market share concentrates on manufacturers capable of processing oversized stone blanks.
   Intelligent integration: Granite bases equipped with temperature & vibration sensors cooperate with AI error compensation algorithms for fully automatic online CMM testing, evolving from static measuring platforms to intelligent data collection equipment.
Eco-friendly low-maintenance products dominate the market: Granite bases are corrosion-resistant, maintenance-free with a service life over 20 years, with lower full-lifecycle costs than metal bases, matching green manufacturing and cost reduction targets.                                                                                     
   Conclusion
   Granite datum bases are essential core components for micron and submicron precision CMM measurement, driven by strong demand from semiconductors, aerospace, new energy and metrology sectors. However, low-quality flooding, insufficient high-end customization capacity and poor selection awareness remain major industry obstacles.
   Supported by global certifications, self-developed premium granite, full-chain aging technology, nano-precision grinding and full-area laser calibration, UNPARALLELED provides stable long-term granite datum solutions for CMM equipment. We will continuously optimize stone screening, oversized integrated machining and intelligent error compensation technologies, aligning with global metrology standards to supply high-stability, traceable granite datums for worldwide high-end precision manufacturing and metrology industries, boosting the high-quality upgrading of domestic high-precision CMM industrial chains.