Long-Term Maintenance Guidelines for CMM Granite Frames

Daily cleaning is the fundamental procedure to slow frame aging and preserve the precision of the reference plane. Standardized routine maintenance must be implemented to prevent micro deformation and abrasion caused by dust, stains and residual debris. After daily operation, wipe the CMM frame’s worktable, guide rails, support bases and joint gaps gently with professional dust-free soft cloth and anhydrous ethanol. Thoroughly remove processing dust, oil contamination, metal chips and ambient floating dust. Hard cloths, steel wool and corrosive cleaners are strictly prohibited to avoid scratching the precision granite surface and damaging nano-level flatness.

Ensure the frame surface is completely dry after cleaning. For idle CMM equipment, cover the working surface with anti-static dust-proof film to isolate moisture, dust and airborne contaminants. Always keep the frame in an unloaded state. Do not place workpieces, tools or counterweights on the granite table during standby. Long-term loading will cause irreversible micro stress deformation, gradually weaken measurement accuracy and compromise data consistency.

Granite frame precision is highly sensitive to temperature & humidity fluctuation, vibration interference and workshop cleanliness. A stable operating environment is essential for long-term precision retention. Following ZHHIMG’s 10,000-class constant temperature and humidity dust-free workshop standards, end users shall maintain a stable workshop environment: constant temperature at 20℃±2℃ and relative humidity between 45%-65%. Drastic environmental fluctuations will trigger thermal expansion and contraction, resulting in reference plane deformation and guide rail precision deviation.

Effective vibration isolation is mandatory. Install CMM frames far away from high-vibration equipment such as stamping, cutting and forging machines, and avoid pedestrian and mechanical vibration interference. Referring to ZHHIMG’s ultra-hard concrete foundation and professional shockproof trench design, eliminate internal stress changes induced by high-frequency and low-frequency vibration. Regularly control workshop cleanliness to prevent dust accumulation on guide rails and reference surfaces, reduce wear on precision moving parts, and ensure stable operation and reliable measurement results.

Establish a hierarchical maintenance system including daily inspection, weekly upkeep, monthly in-depth overhaul and annual full-scale maintenance to eliminate potential precision hazards. Before daily startup, inspect the frame surface for scratches, collisions, stains and dampness, and confirm no looseness or offset at splicing positions and mounting bases. Conduct comprehensive cleaning and re-inspection every week, focus on dead corners and gaps, and verify the initial level accuracy.

Perform monthly deep maintenance to check the level stability of support footpads and fixed bases, and fine-tune horizontal accuracy to ensure uniform stress distribution and prevent partial deformation. Clean and maintain air-bearing structures and assembly joints to guarantee smooth mechanical operation. During annual overhaul, adopt world-class testing equipment including German Mahr dial gauges, British Renishaw laser interferometers and Swiss WYLER electronic levels. In accordance with international standards such as German DIN, American ASME and Japanese JIS, comprehensively detect and calibrate key parameters including flatness, straightness and perpendicularity to correct micro precision deviations.                                                           

As the core metrological benchmark of coordinate measuring machines, granite frame calibration determines the accuracy and credibility of measurement data. ZHHIMG strictly complies with national metrological traceability requirements and recommends professional calibration every 6 to 12 months. All calibration procedures and testing tools meet the specifications of Jinan and Shandong Metrology Institutes, with fully traceable results aligned with national metrology standards.

Calibration is conducted by experienced metrology engineers proficient in global industrial standards. With high-precision micro and nano testing instruments, technicians verify critical indicators including reference flatness, rail parallelism and overall perpendicularity. Minor precision attenuation caused by long-term operation is corrected via sophisticated manual grinding technology. Supported by over 30 years of senior craftsman experience, micron-level precision restoration is achieved to maintain factory-standard accuracy, ensuring reliable detection performance for semiconductors, precision molds, aerospace, new energy and other high-end industries.

Standardized manual operation is critical to avoid frame damage and achieve long-term stable service. During equipment operation, avoid heavy workpiece impact and overloading on the granite working surface. Place and transport workpieces gently to prevent substrate damage and precision offset caused by collision and shock. Never operate beyond rated working conditions to avoid fatigue deformation from long-term overloading.

Shorten maintenance cycles for harsh working conditions with high humidity, heavy dust and high load. Strengthen targeted protection against moisture, dust and abrasion, and regularly inspect surface conditions to eliminate hidden failures caused by erosion and wear. Establish complete equipment maintenance logs to record all cleaning, maintenance, calibration and overhaul records. Full-lifecycle traceable management realizes standardized, normalized and refined precision control for long-term stable operation of CMM granite frames.