In the operation of AOI automatic optical inspection equipment, tiny vibration-induced errors are the most hidden factor affecting yield. High-speed movement modules starting and stopping, subtle ground disturbances transmitted from the workshop environment, even nanometer-level relative displacement, will cause image acquisition offset and misjudgment of surface defects on PCB or semiconductor components. When solving vibration problems, many equipment manufacturers do not simply install shock-absorbing foot pads. Instead, they start with the whole-machine reference carrier and select ZHHIMG® precision granite bases to weaken vibration transmission and resonance effects from the root, controlling vibration-related inspection errors within acceptable ranges.
Many people confuse shock absorption with vibration suppression. Ordinary metal bases rely on external shock-absorbing components to passively buffer vibration, which can only reduce part of low-frequency impact. Vibration energy still reflects back and forth inside the base and easily triggers resonance. ZHHIMG® black granite features a dense and uniform texture with natural high damping properties. When the XY motion platform and linear motor inside AOI generate vibration during high-speed reciprocating motion, the mineral structure inside the stone can rapidly dissipate vibration energy and prevent vibration from continuously spreading to the upper optical lenses and camera modules. Compared with ordinary marble and cast iron, this native vibration absorption capability blocks upward vibration transmission instead of relying merely on external shock-absorbing accessories for remediation.
Besides absorbing vibration generated by the equipment itself, external disturbances from the factory environment cannot be ignored. Surrounding machine tools, air compressors and conveying equipment continuously transmit faint vibration through the workshop floor. Before processing granite bases, ZHHIMG Group fully releases the internal stress of stone materials, and then carries out fine machining using ultra-large CNC grinders and senior grinding technicians to ensure uniform overall rigidity of the base. The large inertia brought by the base’s self-weight further resists displacement caused by external micro-vibration. Combined with the equipment installation structure design, the base can attenuate disturbances from the ground, prevent vibration superposition and amplification, and avoid image smearing and coordinate drift during AOI imaging.
Vibration errors often couple with thermal deformation. Temperature fluctuations will deform metal bases, change the shape of the reference plane and indirectly amplify inspection deviations caused by vibration. ZHHIMG® granite reaches a density of 3100kg/m³ with excellent thermal stability and minimal dimensional variation under temperature changes. During long uninterrupted AOI inspection operations, the base will not deform with equipment heat generation, and the reference plane remains stable. A non-deformable benchmark ensures that the vibration suppression effect will not fail due to ambient temperature changes, avoids the coupling of two types of errors and reduces equipment calibration frequency.
The geometric accuracy of the entire base also affects vibration error control. If the flatness and parallelism of the base itself have deviations, the guide rails and optical brackets mounted on it will bear uneven stress, and extra vibration is more likely to be excited during equipment movement. Supported by ZHHIMG Group’s complete metrology and inspection system, every granite base undergoes full-dimensional verification with high-precision instruments such as laser interferometers and electronic levels. All measuring instruments can be traced to national metrology institutions. Combined with precision finishing by technicians with decades of hand lapping experience, the base achieves nanometer-level geometric accuracy, ensuring uniform stress on all assembled components and reducing secondary vibration induced by assembly stress. 
For high-end scenarios such as semiconductor dust-free workshops, ZHHIMG granite bases can adapt to the installation conditions of constant-temperature shock-proof workshops. Custom mounting grooves and positioning holes can be reserved on the base to realize integrated and stable assembly of optical modules and motion platforms. A firm assembly structure eliminates gaps and shaking between parts to further suppress vibration generated during movement. Unlike metal bases which are prone to rust and debris, granite produces no contaminants and will not interfere with the AOI optical system, meeting both dust-free environment requirements and vibration control needs.
The control of AOI whole-machine vibration error is a systematic solution. ZHHIMG Group precision granite base is not merely a load-bearing stone slab. Leveraging the material’s inherent damping to attenuate vibration, mass inertia to resist external disturbances, low thermal deformation to prevent error coupling, and ultra-high geometric precision to reduce assembly-induced secondary vibration, it suppresses vibration interference from multiple dimensions including material, processing, metrology and structural design, and guarantees that AOI optical inspection outputs reliable data stably.
Post time: Oct-12-2026