As the core site for precision value traceability, workpiece calibration and equipment accuracy verification, metrology workshops impose extremely stringent requirements on benchmark load-bearing platforms. Unlike ordinary production workshops, errors in metrology inspection often stem not from insufficient accuracy of the measuring instruments themselves, but from micro-vibration and electromagnetic field interference. Traditional cast iron and steel reference platforms have inherent drawbacks. Metallic materials are prone to magnetization and feature high resonance coefficients. Minor floor vibration, shaking caused by equipment startup and shutdown, and magnetic field fluctuations from surrounding electrical devices can all transfer to the reference surface. This leads to drifting readings and poor repeatability for micrometers, interferometers, coordinate measuring machines and precision grating sensors, failing to meet the strict standards of national-level metrology calibration and precision workpiece inspection. UNPARALLELED Group (Brand: UNPARALLELED®) mechanically finely machined granite plates combine the inherent physical properties of natural stone with refined CNC machining technology. They deliver excellent vibration damping performance and non-magnetizable characteristics, perfectly matching the demanding requirements of metrology workshops for high precision, long-term stability and anti-interference.
Magnetization is a key pain point for metallic reference platforms in metrology workshops. When placed near power distribution units, inspection instruments and motor modules for a long time, metal platforms are easily magnetized by external magnetic fields and retain residual magnetism. Magnetized metal platforms continuously attract iron filings and fine metallic dust, which can scratch precision workpieces and reference surfaces. Worse still, residual magnetism disturbs signal accuracy of grating sensors, laser detection modules and magnetoelectric measuring instruments, causing measurement deviations and undermining the authenticity and traceability of metrology data.
Made of high-purity black natural granite, UNPARALLELED® mechanically finely machined granite plates feature a purely non-metallic mineral structure mainly composed of non-magnetic minerals such as quartz and feldspar without any ferromagnetic components. They are naturally non-magnetizable, non-magnetic conductive and free of residual magnetic field. Even when kept in metrology workshops densely packed with electromagnetic equipment or frequently used with precision magnetic workpieces, the plates remain magnetically neutral. There will be no accumulated magnetization, no attraction of metallic contaminants and no interference with magnetic or optical signals of precision measuring instruments. In addition, after dedicated mechanical finishing and cleaning treatment, the plate surface contains no metallic machining residues or hidden magnetization risks, completely eliminating electromagnetic interference issues associated with metallic reference platforms and guaranteeing the purity and accuracy of metrology data.
Vibration resistance is another critical performance indicator for metrology reference platforms. Metrology inspection relies on static precise readings, micro-displacement detection and micron-scale dimensional calibration, which demand outstanding micro-vibration suppression from reference platforms. Cast iron and metal platforms have low damping coefficients and tend to resonate. Faint vibration generated by air compressors, air conditioning systems, personnel movement and adjacent machine tools in the workshop will be amplified through resonance on metal tabletops. This causes slight table shaking, preventing stable readings in high-precision measurement and resulting in data fluctuation and poor repeatability.
Benefiting from its dense stacked crystal structure, UNPARALLELED mechanically finely machined granite plates feature far superior natural vibration damping compared with metals. The damping coefficient is several times higher than conventional cast iron. The material quickly absorbs and dissipates low-frequency and high-frequency micro-vibration energy inside the workshop, blocking vibration transmission and resonance amplification to form a stable low-vibration reference tabletop. Unlike roughly processed stone plates with loose crystals and micro-pores that lead to uneven vibration absorption, the brand's full-set CNC mechanical finishing adopts layered precision grinding and homogenized stress conditioning to optimize the consistency of bulk density across the plate. Uniform vibration damping performance is maintained over the entire plate without residual local vibration. Even under continuous faint vibration interference in metrology workshops, the tabletop stays extremely stable, providing a shake-free benchmark for laser interferometry, ultra-precision dimensional calibration and gauge block verification.
Tailored for harsh working conditions in metrology workshops, UNPARALLELED optimizes its proprietary process system during mechanical finishing to further leverage the non-magnetic and vibration-resistant advantages. First, the base material undergoes multiple rounds of natural aging and constant-temperature stress relief to fully eliminate internal structural stress. The plate will not deform or warp during long-term service, preserving the flatness of the reference surface and preventing metrology errors induced by stress deformation coupled with vibration disturbance. Second, full CNC mechanical precision grinding avoids uneven surface textures from manual processing and creates a smooth nano-flat tabletop free of micro-undulations and machining residues. It reduces dust accumulation and meets the cleanroom standards of metrology workshops.
Furthermore, adapted to the constant temperature and humidity environment and continuous calibration routines of metrology workshops, mechanically finished granite plates have an ultra-low coefficient of thermal expansion with uniform deformation. Minor fluctuations in temperature and humidity will not trigger tabletop distortion. Combined with the material's wear resistance, corrosion resistance and rust-free properties, the plates require minimal calibration and maintenance. Their vibration-resistant and non-magnetic performance remains stable over long service life, greatly cutting calibration frequency and operation costs of measuring equipment.
For factory quality control, all plates are finished and verified in a Class 10000 constant-temperature, constant-humidity and dust-free metrology workshop. Imported traceable measuring instruments are used to inspect flatness, parallelism and vibration damping stability piece by piece. Special residual magnetic field tests are also carried out to ensure each plate delivers zero magnetization, high vibration resistance and stable high precision, fully satisfying equipment access requirements of metrology institutes and precision testing laboratories at all levels.
In summary, the core requirements for reference platforms in metrology workshops are anti-interference, stable benchmark, high precision and long-term reliability. With naturally non-magnetic material properties, superior vibration damping and refined CNC machining technology, UNPARALLELED mechanically finely machined granite plates thoroughly resolve magnetization, resonance and reading drift issues of traditional metallic reference platforms. They serve as stable and reliable benchmark carriers for precision metrology, quantity traceability and high-precision workpiece calibration, and are the preferred benchmark equipment for high-end metrology workshops and precision testing laboratories.