День: 04/08/2026

I. Raw Material Control: Determining Precision Stability from the SourceMaterial selection must be fine-grained structurePreferred materials: Jinan Green, Zhangqiu Black, Mount Tai Green, etc., dense graniteRequirements: Uniform grain, crack-free, no laminations, no porosityDensity ≥2.60 g/cm³, water absorption ≤0.25%Billets must be fully agedNatural aging ≥6 months, large platforms ≥12 monthsProhibit the use of newly quarried, unrelieved…

I. Before Use: Eliminate “Sources of Error” First II. During Use: Correct Operation to Reduce Huror III. Core Techniques to Reduce Error (Very Practical)Reverse Measurement Method (To cancel out the square’s own error)Fire: The front side of the square contacts the workpiece.Second time: The square is flipped 180° and contacts again.Take the average of the…