Precision Granite Bridge: Stability & Accuracy for CMM

Sourced from Nature, Perfected to the Micron, Infusing Your CMM Equipment with a  Core Power

About Us: Manufacturing Specialists Focused on Core Precision Metrology Components

As a source manufacturer with years of expertise in the field of precision granite components, we deeply understand that the performance ceiling of every high-end Coordinate Measuring Machine (CMM) hinges on the quality of its core motion component—the Granite Bridge.

In 2026, an era of comprehensive intelligent manufacturing upgrades, we are no longer merely stone processors, but providers of high-precision metrology solutions. We select top-tier global mineral sources for our black, fine-grained granite. Combined with aerospace-grade grinding processes and digital temperature control technology, we supply domestic and international renowned CMM OEMs, vision measuring instrument manufacturers, and automated inspection integrators with sub-micron accuracy, customized granite bridge components.

Why Choose Our Granite Bridge? Four Core Values

1. Ultimate Precision Control: Redefining “Stability”

In CMM applications, the geometric accuracy of the bridge directly determines the machine’s measurement uncertainty.

1）Ultra-Precision Grinding:We employ a hybrid process of hand scraping and CNC polishing, ensuring bridge straightness ≤ 0.5μm/m, flatness ≤ 1.0μm/m², and twist < 2 arcseconds.

2）Minimized Abbe Error:Through ultra-high-precision datum surface machining, we eliminate the amplification effect of Abbe error caused by beam deformation at the physical source, helping your equipment easily achieve accuracy grades of ±(1.5 + L/300) μm or even higher.

3）Perfect Fit for Air Bearing:Surface roughness is controlled within Ra 0.4μm, providing an ideal air film support surface for air bearing guides, ensuring smooth, chatter-free motion.

2. Natural High Damping: The “Stabilizing Anchor” for High-Speed Scanning

Facing the demands of modern CMMs for high-speed continuous scanning, vibration is the greatest enemy of accuracy.

1）Excellent Vibration Damping:​ The internal damping coefficient of our granite is 15-20 times that of steel. After high-speed acceleration/deceleration stops, residual vibration rapidly decays to a stable range within 0.3 seconds.

2）Cleaner Data:​ Effectively suppresses high-frequency probe chatter, significantly improving the smoothness and authenticity of scanned point clouds. Especially suitable for high-efficiency inspection of complex surfaces, blades, and molds.

3. Temperature-Stable Performance: Unfazed by Environmental Fluctuations

1）Low Thermal Expansion Coefficient:​ We use premium “Jinan Black” or equivalent imported black corundum granite with a stable, isotropic thermal expansion coefficient of (7-8)×10⁻⁶/°C.

2）Zero Creep Characteristic:​ After years of natural aging and artificial stress relief treatment, internal stresses are completely released. Even after a decade of high-intensity use, the geometry remains with zero deformation and zero creep, guaranteeing accuracy consistency throughout the equipment’s entire lifecycle.

3）Shop Floor Adaptability:​ Maintains excellent measurement repeatability even in production environments with less-than-perfect temperature control, making it the ideal choice for shop-floor CMMs.

4. Source Manufacturer Customization: Flexible Response, Optimal Cost

1)Non-Standard Customization Capability:​ Whether for moving bridge, fixed bridge, or gantry-type structures, we can provide one-to-one customization based on client drawings, supporting special requirements like embedded temperature sensor mounting holes and lightweight rib designs.

2)Rapid Delivery:Equipped with large CNC machining centers and a temperature-controlled grinding workshop. Standard models are available from stock, with custom products delivered in as fast as 2 weeks.

3)Best Value:Eliminating middlemen, we offer quality rivaling top international brands at factory-direct prices, empowering CMM equipment to enhance their core competitiveness.