I. Preparation Before Use: Cleaning and Inspection
Before any adjustments, ensure the worktable is clean and undamaged:
1. Thoroughly Clean the Worktable Surface: Use a dedicated cleaner and a lint-free cloth to remove oil, dust, and welding slag residue to prevent impurities from affecting measurement accuracy.
2. Inspect Surface Defects: Observe for scratches, dents, or localized deformation, paying particular attention to whether T-slots and positioning holes are blocked or worn.
3. Confirm Fixture Integrity: Check that positioning pins, pressure plates, quick clamps, and other accessories are complete and move freely to ensure reliable subsequent clamping.
Cleanliness is not only a hygiene requirement but also the first step in ensuring accuracy.
II. Coarse Adjustment: Basic Leveling Correction (Macroscopic Stability)
The goal is to eliminate torsional stress caused by improper installation and ensure even force distribution at the support points.
1. Select Appropriate Measuring Tools: Use a 00-grade coincidence level or electronic level. Calibrate its accuracy before measurement.
2. Employ the "Three-Point Surface" Method: First, adjust the three main support points of the platform to center the bubble in one direction (e.g., the long side); then adjust the fourth point to level it in the vertical direction (e.g., the short side); repeat cross-measurements and fine-tuning until the readings in all directions are consistent.
3. Tighten Anchor Bolts: Evenly tighten all support bolts to prevent loosening and secondary deformation.
4. Environmental Control: Avoid direct sunlight, wind, or vibration interference. Ensure the temperature is balanced with the workshop environment to prevent thermal expansion and contraction from affecting the results.
This stage does not pursue ultimate precision but rather establishes a stable benchmark for fine-tuning.
III. Fine-tuning: Repairing the Flatness of the Working Surface (Microscopic Precision) For localized unevenness after welding repair or long-term use, high-precision machining is required.
Method 1: Manual Scraping (Suitable for high-precision requirements)
Contact Point Inspection: Apply red lead to a standard flat surface and rub it against the workpiece surface, marking the highest contact points.
Successive Scraping: Each scraping step is controlled at 0.003–0.005 mm. Repeatedly check until the contact point density is ≥16 points/200mm × 200mm.
Advantages: Achieves flatness ≤0.03mm/m, a traditional "gold standard" method.
Method 2: Mechanical Milling (Suitable for large-area rapid repair)
Fix the platform onto a gantry milling machine, using the back rib plate as a reference for alignment.
Use a disc milling cutter to perform a single-pass precision milling of the entire workpiece surface.
Advantages: High efficiency, suitable for overall repair of large platforms.
Scraping is suitable for small-area, high-precision repairs, while milling is suitable for large-area, rapid restorations.
IV. Accuracy Calibration and Verification
After adjustment, the effect must be verified using professional instruments:
1. Laser Interferometer Scanning: Check the overall flatness to ensure it meets factory standards (usually ≤0.15mm/1000mm);
2. Coordinate Measuring Machine Verification: Check the positional tolerance of key positioning holes, requiring within ±0.05mm;
3. Regular Re-testing Mechanism: It is recommended to perform a comprehensive calibration every 6 months to promptly identify minor deviations.
Calibration is not a one-time task, but a core part of continuous maintenance.
V. Daily Maintenance Recommendations
1. Rotate Usage Areas: Avoid long-term unbalanced loading and implement a "regional rotation system" to distribute the load;
2. Spray Anti-spatter Liquid: Reduce weld slag adhesion and protect the table surface mesh holes and T-slots;
3. Prohibit Impacting or Arc Ignition: Prevent mechanical damage and electrical corrosion;
4. Rust Prevention Treatment When Idle: Apply rust-preventive oil and cover with dustproof cloth.
