I. Situations Where On-Site Adjustment is Possible: Overall Tilting or Uneven Support
When the flatness error manifests as a sloping surface with one end higher than the other, it is usually caused by an uneven installation foundation or uneven stress on the support legs. These problems can be directly leveled on-site.
1. Tool Preparation
Use an electronic level with an accuracy of at least 0.02mm/m to ensure reliable measurement. Clean the table surface before adjustment to avoid interference from debris.
2. Adjustment Steps
Loosen all anchor bolts or support shims to release pre-tightening stress.
Measure each element along a "X" shaped path (two diagonals + four side centerlines), recording the bubble offset value in each direction.
Based on the "three-point plane" principle, prioritize adjusting the three main support points: first, center the long side, then adjust the short side, making cross-adjustments until the readings in all directions are consistent.
After adjustment, evenly tighten all fixing bolts to prevent secondary deformation due to unilateral stress.
3. Re-measurement and Confirmation: After tightening, remeasure to ensure the flatness is restored to ≤0.10mm/1000mm (precision-grade standard) before production can begin.
📌 Warm Reminder: Avoid direct sunlight or equipment vibration during the adjustment process. The ambient temperature should be constant with the workshop temperature to prevent thermal expansion and contraction from affecting the results.
II. Situations Requiring Professional Repair: Local Deformation or Structural Twisting
If the inspection shows a central bulge, edge depression, saddle-shaped or drum-shaped deformation, it indicates that the platform body has undergone plastic deformation and must be repaired by a professional manufacturer using mechanical or technological methods.
1. Manual Scraping Repair
For high-precision platforms (e.g., flatness requirement ≤0.05mm/1000mm), manual scraping is the best choice. Apply red lead to a standard flat plate and rub against it. After exposing the high points, remove them point by point with a scraper, repeating the process until even contact is achieved. This method can achieve sub-micron level precision and forms oil-retaining micro-pits on the surface, resulting in superior wear resistance.
2. CNC Precision Milling Repair: For large-area minor deformations, a gantry milling machine can be used for overall precision milling. After fixing the platform, align it with the back reference surface and use a disc milling cutter for one-pass machining. This method is highly efficient and can quickly restore flatness to within 0.08mm/1000mm.
3. Vibration Aging + Mechanical Correction: If the deformation is caused by the release of internal stress, vibration aging treatment must be performed first to redistribute and attenuate residual stress. Then, hydraulic equipment should be used to slowly apply pressure to the protruding parts for leveling, avoiding material damage.
III. Key Actions After Adjustment:
1. Re-testing and Verification: After repair, use a coordinate measuring machine or laser interferometer to re-test, ensuring the data meets standards and issuing a report.
2. Establishing Accuracy Archives: Archive the data from each test, draw trend charts, and predict the next correction cycle.
3. Strengthening Daily Maintenance: Clean weld slag after each welding to avoid localized corrosion; conduct a basic level check every quarter to prevent problems before they occur.
