1. Optical Alignment Level Method (Recommended for On-Site Inspection)
Principle: Calculates the overall flatness error by measuring the relative height differences between multiple points on the table surface.
Operating Steps:
Clean the worktable thoroughly, removing oil and welding slag.
Draw a uniform grid along the length and width of the table surface (e.g., one measuring point every 200mm).
Place the optical alignment level at the starting point, zero it, and move it point by point, recording the tilt value at each position.
Convert the tilt values into height differences, use the least squares method to fit an ideal plane, and calculate the maximum deviation.
Advantages: Portable, strong anti-interference, suitable for on-site inspection of large platforms.
2. Coordinate Measuring Instrument Method (High-Precision Laboratory Inspection)
Principle: Collects the three-dimensional coordinates of hundreds of points on the table surface using a probe; the software automatically fits the plane and calculates the flatness.
Key Points: The number of measurement points should be no less than 50, evenly distributed.
3. Laser Interferometer Method (Ultra-high Precision Inspection, Suitable for Precision Platforms)
Principle: Utilizes a laser beam to scan the platform surface, analyzing surface undulations through interference fringes.
Applicable Scenarios: Acceptance or calibration of high-precision platforms requiring flatness ≤0.05mm/1000mm.
Features: Non-contact measurement, high speed, extremely high precision, but high equipment cost.
4. Dial Indicator + Reference Plate Method (Simplified Comparison Method)
Operation: Place the 3D welding worktable on a high-precision reference plate, fix the dial indicator with a magnetic base, and measure the height difference between the platform and the reference plane point by point.
Applicable Situations: Rapid comparison of small and medium-sized platforms to determine if local deformation has occurred.
