I. Pre-Calibration Preparation
1. Environmental Requirements
Ensure the worktable maintains a constant temperature (recommended 20 ± 2°C) to prevent thermal deformation from affecting measurement accuracy.
Clean the tabletop and remove all welding slag and foreign matter to prevent interference with the measurement reference surface.
2. Tool Preparation
High-precision measuring equipment: laser tracker (such as the API Radian series) or laser interferometer.
Auxiliary tools: level, standard gauge blocks, and anti-vibration pads.
II. Calibration Method
1. Laser Interferometer Calibration Method
Create a 5×5-inch measurement grid on the worktable surface and scan the coordinates of each node using a D22 rotating laser.
Use EASY-LINK software to generate a 3D line graph and analyze the deviation between the highest and lowest points (for example, if pin 2 is high and pin 4 is low, adjustments may be required).
2. Laser Tracker Dynamic Calibration
Deploy a Radian laser tracker and use an SMR target to collect coordinates of key points on the tabletop. Use the iScan3D scanning probe to acquire full-surface point cloud data and fit the best-fit plane.
3. Halcon 3D Plane Correction Method
Calculate reference plane parameters (such as α, β, and mean value) from the 3D point cloud data.
Use the plane interpolation method to correct defective areas and generate a corrected 3D model.
III. Adjustment and Verification
1. Mechanical Adjustment
Based on the measurement results, adjust the foot pad height to compensate for flatness errors (adjustment per foot pad ≤ 0.02mm).
Use a torque wrench to evenly tighten the anchor bolts to avoid localized stress and deformation.
2. Repeat Verification
After adjustment, remeasure until the flatness error is ≤ 0.05mm (ISO 230-1 standard).
Long-term Stability Test: Retest after 24 hours of continuous operation to confirm there is no thermal deformation drift.
IV. Precautions
After calibration, perform anti-rust treatment (apply anti-rust oil or butter) and recheck regularly. Avoid hammering on the table to prevent damage to the flatness.
