The Impact of Microscopic Surface Quality of Granite Bases on Equipment Performance
Microscopic quality mainly includes: roughness, microscopic defects, cleanliness, micro-flatness, material homogeneity, and non-magnetism.
Any failure to meet standards will directly affect equipment precision, stability, cleanliness, service life, and yield.
I. Roughness Failure (High Ra Value)
Impact:
Jammed moving parts, rapid wear
Guide rails, slides, and mounting surfaces for optical components are not smooth enough, increasing motion resistance, vibration, and shortening rail life.
Optical precision degradation
Surface micro-undulations cause lenses, cameras, and light sources to tilt, resulting in blurry imaging, misalignment, and positioning drift.
Vacuum suction leakage
Microscopic unevenness of the vacuum table leads to poor sealing, vacuum leakage, and failure to hold workpieces firmly, causing a sharp drop in yield.
In short: Poor roughness = Low equipment precision, unstable motion, vacuum leakage.
II. Microscopic Defects (Scratches, pits, chipping, micro-cracks)
Impact:
Flaking and dust contamination (fatal for semiconductors)
Small chips, micro-cracks, and loose spots will shed fine powder under vibration, contaminating wafers, optical lenses, and cleanrooms, directly scrapping products.
Stress concentration, cracking, and deformation later
Micro-cracks expand under long-term vibration and temperature changes → base deformation, loss of precision, and equipment scrapping.
Poor installation fit, uneven force distribution
Scratches and pits cause false contact on contact surfaces → deformation under force, inaccurate positioning, and poor repeatability.
In short: Microscopic defects = Powder contamination later deformation unstable installation.
III. Poor Surface Cleanliness (Oil stains, water marks, stone powder, residues)
Impact:
Contamination of semiconductors / optical components
Oil stains and stone powder directly fall on wafers and lenses → sharp drop in yield, customer complaints, and failure to pass acceptance.
Affect bonding / sealing
Oil stains in threaded sleeves, sealing grooves, and vacuum channels → poor bonding, leakage, and loosening.
Accelerated aging and rusting
Residual water and acidic/alkaline substances → rusting of embedded parts, discoloration of stone, and microscopic corrosion.
In short: Unclean = Wafer contamination sealing failure accelerated aging.
IV. Poor Microscopic Flatness (Waviness, undulations, high/low points)
Impact:
Equipment datum tilt, flatness drift
Even microscopic height differences of 1–2 μm will make the equipment datum uneven → motion deviation, inaccurate positioning, and poor repeatability.
Optical system distortion
Micro-undulations → tilted optical paths, spot offset, and inaccurate focusing.
Uneven force distribution, long-term deformation
Long-term pressure on local high points → base creep and gradual loss of precision.
In short: Microscopic unevenness = Inaccurate datum optical distortion long-term deformation.
V. Impure material, magnetism, impurity particles
Impact:
Magnetic field interference (fatal for semiconductors)
Ferromagnetic minerals → affect optical alignment, sensors, motors, and CCDs, causing precision drift and erratic positioning.
Local flaking, uneven hardness
Impurities and loose spots → detachment after grinding, powder shedding, and surface pitting.
Inconsistent thermal expansion
Impurities have different expansion coefficients than the stone → deformation under temperature changes.
In short: Impure material = Magnetic interference powder shedding thermal deformation.
Summary (Most Critical, Directly Used for Customer Communication)
Poor microscopic quality of the granite base will lead to equipment issues:
Low precision, inaccurate positioning, poor repeatability
Jittery motion, excessive vibration, rapid rail wear
Blurred optical imaging, alignment drift, low yield
Vacuum leakage, seal failure, unstable suction
Powder shedding contamination, wafer scrapping, cleanroom risks
Long-term deformation, precision drift, shortened lifespan
Conversely: The better the microscopic quality, the more stable, accurate, and long-lasting the equipment will be, resulting in higher yield and less maintenance.
