Global Form Deviation Evaluation of Free-Form Surface using Coordinate Measuring Machine

In the modern manufacturing, free-form surface evaluation for confirmation the quality of produced as compare to the CAD model is crucial topic. A free-form surface is evaluated using contact and non-contact measuring instruments. The most common and old method of free-form surface evaluation is using contact coordinate measuring machine (CMM). To evaluate a surface using CMM, it is obvious that infinite sample point is required. But due to impractical practice samples are reduced to finite size. This finite sample size they can represent the surface to the extent level but not the whole surface. This paper investigates the novel method of free-form surface, in global form deviation evaluation of an adaptive sampling strategy using the dense sample cloud point. The dense sample cloud point gives true global form deviation. The measurement is made on 3 degree free-form surface and measure using contact probe. The proposed method is compared to the small sample size form deviation evaluation to validate its effectiveness and robustness