EXTREMELY LOW COST SCANNING SYSTEM FOR FREE FORM SURFACES
International Journal of Recent Advances in Mechanical Engineering (IJMECH)
ISSN: 2200-5854
ABSTRACT
Reverse engineering is the process of reconstructing a computer model for physical object based on 3D data point captured from the surface of the object. This work presents a low end and extremely cost effective technique for representing the free form surfaces of physical objects in a CAD model. An analogue signal was used to acquire the free form surface data unlike conventional methods like laser scanners or Coordinate Measurement Machines (CMM). The surface was scanned using a Linear Variable Differential Transducer, (LVDT) as position sensor for measuring the data from the surface of the object. The analogue signal was acquired through a data acquisition system in a continuous fashion to PC. Solid works CAD/CAM software was used to obtain the free form surface from the acquired 3D data using spline technique. A dedicated system was constructed to collect data using vertical milling machine. The benefit of this scanning technique is the ability to scan the target free form surface of the physical object in the following aspect: cost effective scanning technique, low end acceptable accuracy, speed and ease of calibration. Special software was built to minimize the data acquired during the scanning operation for reducing modeling time.
KEYWORDS
3D digitizing; reverse engineering; surface modeling; line scan.
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