These days in the field of engineering several types of 3-D scanners such as laser or optical 3D scanners are used for object digitalization .In this work comparing two types of 3-D non-contact type scanners that is V5 perceptron 3D laser scanner and 3D SYSTEMS CAPTURE SCANNER(fast blue light 3D scanning technology).The physical object is scanned individually for obtaining point cloud data of a existing freeform surface through these two scanners .The obtained data through scanning is then

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... ated into ASCII(.asc file )file format type.So eventually both scanned files are evaluated through concerned reverse engineering software with necessary modules.In this standard deviation, Deviation status and deviation distribution are evaluated by comparing the reverse engineering model with the original CAD model over the free form surface.