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US 9,752,868 B2Granted
Optical measurement of lead angle of groove in manufactured part
AssigneeBruker Nano, Inc.
InventorsErik Novak, Florin Munteanu
Life of this patent
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AssigneeBruker Nano, Inc.
InventorsErik Novak, Florin Munteanu
Estimating the term…
A portion of the surface of a cylindrical part with a machined groove is mapped with an optical profilometer during the manufacturing process and the height map is fitted to a virtual cylindrical configuration that best fits the data. Two-dimensional Fourier Transfer analysis of the map data is advantageously used to find the orientation of the groove on the part. The orientation of the groove is then compared to the longitudinal axis of such virtual cylinder to calculate the groove's lead angle. If the measured lead angle is outside a predetermined design tolerance deemed acceptable for manufacturing purposes, the part is removed from the fabrication line.
A method of detecting a defect for quality-control purposes in a lead angle of a groove in a surface of a part during a manufacturing process of the part, comprising the following steps:
A method detecting a defect for quality-control purposes in a lead angle of a groove in a surface of a part during a manufacturing process of the part determining the lead angle of a groove on a part's surface, comprising the following steps:
Non-transitory computer readable medium containing computer instructions stored therein for causing a computer processor to perform the steps of detecting a defect for quality-control purposes in a lead angle of a groove in a surface of a part during a manufacturing process of the part by profiling a region of the surface with an optical profilometer to obtain a height map of said region of the surface, fitting said height map to a virtual three-dimensional geometric shape, thereby defining an orientation of a preferred axis thereof, determining said lead angle by comparing an orientation of said groove with said orientation of the preferred axis of the geometric shape;
Non-transitory computer readable medium containing computer instructions stored therein for causing a computer processor to perform the steps of detecting a defect for quality-control purposes in a lead angle of a groove in a surface of a part during a manufacturing process of the part by profiling a region of the surface with an optical profilometer to obtain a height map of said region of the surface, defining an orientation of a preferred axis of the part based on an expected value of locally determined preferred axes, determining said lead angle by comparing an orientation of said groove with said orientation of the preferred axis of the part;
Dependencies are inferred from the claim text.