1,720,993 research outputs found
Least Squares Assessment of Flatness, Cylindricity and Sphericity Through Surface Classification Based on Continuous Symmetry of Geometric Object
No full textFlatness, Cylindricity and Sphericity Assessment Based on the Seven Classes of Symmetry of the Surfaces
No full textDimensional inspection of a manufactured surface by means of a coordinate measuring machine (CMM) produces a set of Cartesian coordinates. The coordinates are processed to yield the geometric tolerance of the surface. This paper presents a new approach to the evaluation of flatness, cylindricity and sphericity tolerance based on surface invariance with regard to the rigid motions. The proposed algorithm transforms, through homogeneous transformation matrices, the coordinates measured to best fit the reference element of the surface class from which the actual measurements were sampled. The transformation matrix is simplified taking into account the invariance of the sum of the squared normal distances of the measured points from the nominal surface as regards some rigid motions. This invariance is a consequence of the invariance as regards some displacements of the nominal surface from which the data points were sampled. In this way, the number of parameters to be optimised is reduced in comparison with the six parameters characterizing the general homogeneous transform matrix. The methodology was computer implemented and numerical simulations were performed for planes, cylinders, and spheres in order to validate the effectiveness of the approach. The results indicate that the proposed algorithm provides accurate and quick assessments
Winding time reduction in robotized filament winding: winding trajectory planning by die boundary offsetting
No full textTrajectory planning in robotized filament winding by offsetting die boundary to control roving tension
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Influenza dei picchi esotermici sulle proprietà meccaniche di laminati a spessore elevato
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Robotized Filament Winding of Full Section Parts:Comparison Between TwoWinding Trajectory Planning Rules
No full textA solution to manufacture structural parts with concave surfaces by robotized filament winding
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