Jinan Black: Best cost-performance ratio, high density, compact structure, minimal deformation; the first choice for general precision platforms, CMM bases, and inspection plates; largest industrial usage volume.
Mount Tai Black \/ Zhangqiu Black: Higher hardness and better wear resistance; suitable for ultra-high precision laboratories, metrology institutes, and semiconductor equipment bases.
Black and White Marble \/ Ordinary Granite: Coarse texture, average stability; only suitable for ordinary tooling and rough inspection; strictly prohibited for precision instrument bases.<\/li>\n\n\n\n
Density: \u22652.95g\/cm\u00b3; the heavier, the more stable, and the better the vibration resistance.
Coefficient of Linear Expansion: The lower the better; precision equipment preference \u22646.5\u00d710\u207b\u2076\/\u2103.
Flatness Precision Grade
000 Grade: Metrology institutes, laboratory benchmarks, ultra-high precision instruments.
00 Grade: CMMs, vision measuring machines, precision inspection.
0 Grade: Workshop routine inspection, tooling and fixtures.
Thickness Selection: The larger the tabletop, the thicker it must be; otherwise, it is prone to deformation and sagging.<\/li>\n\n\n\n
Large bases must have weight-reducing ribs and closed cavities to reduce weight while maintaining rigidity.
Installation holes, threaded holes, and T-slots must be customized in advance; drilling later is prone to chipping and precision loss.
Precision guide surfaces should prioritize integral single-piece granite without splicing.
II. Selection of Processing Technology (Essential for Factory Coordination)
Aging Treatment: Natural aging of raw blocks artificial secondary aging to eliminate internal stress and prevent future deformation.
Processing Flow: Rough cutting \u2192 Precision milling \u2192 Manual fine grinding \u2192 Constant temperature lapping \u2192 Laser precision inspection.
Surface Treatment:
Precision Working Surface: Fine mirror finish, micrometer-level flatness.
Non-working Surface: Flame finish \/ Machine cut finish to save costs.
Hole Position Precision: Position tolerance of installation holes, countersunk holes, and threaded holes controlled within \u00b10.02mm.
III. Installation and Workshop Placement Standards
\u042d\u043a\u043e\u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f
Avoid direct sunlight and direct air currents; excessive temperature differences cause thermal deformation.
Keep away from strong vibration equipment such as punch presses and cutting machines.
Precision instruments are best placed in a constant temperature workshop: 20\u00b12\u2103.
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Large granite platforms use three-point positioning support (most stable, prevents twisting deformation).
Add anti-vibration pads and leveling feet for easy leveling adjustment.
Leveling Calibration
Level using a precision level; do not move or pry after fixing.
IV. Daily Maintenance and Care (To Extend Precision Lifespan)
Cleaning
Wipe with anhydrous alcohol or a dedicated neutral cleaner; do not use strong acids, strong alkalis, or machine oil.
Scratch Prevention
Do not drag steel workpieces directly; place soft rubber or copper sheets under workpieces.
Bump Prevention
Corners are most prone to chipping; handle with care during transportation and use.
Prohibition of Unauthorized Drilling\/Cutting
Unauthorized processing will destroy internal stress, rendering precision useless.
Regular Re-inspection
High-precision platforms should be re-inspected for flatness every six months to one year; return to the factory for precision grinding repair if necessary.<\/li>\n<\/ol>\n\n\n\n
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