Source: http://www.google.ca/patents/US5419222
Timestamp: 2016-10-28 16:06:44
Document Index: 591674686

Matched Legal Cases: ['art. 3', 'art. 5', 'art. 11', 'art. 16', 'art. 21', 'art. 25', 'art. 27']

Patent US5419222 - Method for measuring the contour of a machined part - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method for measuring the contour of a machined part with a contour gage apparatus, having a probe assembly including a probe tip for providing a measure of linear displacement of the tip on the surface of the part. The contour gage apparatus may be moved into and out of position for measuring the part...http://www.google.ca/patents/US5419222?utm_source=gb-gplus-sharePatent US5419222 - Method for measuring the contour of a machined partAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5419222 APublication typeGrantApplication numberUS 08/145,537Publication date30 May 1995Filing date4 Nov 1993Priority date8 Oct 1992Fee statusLapsedPublication number08145537, 145537, US 5419222 A, US 5419222A, US-A-5419222, US5419222 A, US5419222AInventorsLothar F. BiegOriginal AssigneeThe United States Of America As Represented By The United States Department Of EnergyExport CitationBiBTeX, EndNote, RefManPatent Citations (5), Referenced by (30), Classifications (18), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMethod for measuring the contour of a machined part
US 5419222 AAbstract
1. A method for measuring the contour of a three-dimensional machined part carried on a machining apparatus, to obtain measurement data, the method comprising the steps of:a) retaining the machined part on the machining apparatus; b) positioning a contour gage apparatus, which is independent of the machining apparatus but operationally connected thereto through computer means for providing feedback to the machining apparatus, said contour gage apparatus having a probe tip, whereby the probe tip continuously contacts the machined part during the measurement operation; c) indexing the machined part and the contour gage apparatus to a defined position for the origin of a predetermined path for measurement; d) performing a scanning operation by sweeping the entire surface of the machined part with the probe tip, according to the predetermined path, by changing the positions of the probe tip and the machined part relative to each other, for obtaining measurement data along the predetermined path; and e) providing direct feedback of the obtained measurement data from the contour gage apparatus to the machining apparatus for correction of potential errors in the machining of the part before completing the machining process. 2. The method described in claim 1, further comprising the step of:moving the contour gage apparatus in and out of measuring position with respect to the machined part. 3. The method described in claim 1, wherein the probe tip is held substantially normal to the surface of the machined part during the measurement operation.
4. The method described in claim 1, further comprising the steps of:holding the machined part stationary; rotating the probe tip; sweeping the probe tip in a meridian sweep pattern over the surface of the machined part; and recording data representing linear positions of the probe tip when the part is stationary and after the position of the probe tip is changed with respect to the stationary part. 5. The method described in claim 4, further comprising the step of sweeping the probe tip in a plurality of meridian sweeps.
10. The method described in claim 1, further comprising the steps of:rotating the probe tip and the machined part in a predetermined rate of rotation; tracing a spiral sweep pattern with the probe tip over the surface of the machined part; and recording data representing linear positions of said probe tip after the part is rotated and after the position of the probe tip is rotated following the rotation in position of the part. 11. The method described in claim 10, further comprising the step of sweeping the probe tip in a plurality of spiral sweeps.
14. The method described in claim 13, further comprising the step of:indexing the machined part and the probe tip incrementally for individual point measurements. 15. A method for real-time adjusting of a machining apparatus that machines an actual part, comprising the steps of:a) obtaining ideal contour data representing an ideal machined part; b) performing an initial machining operation on the actual part; c) retaining the actual machined part on the machining apparatus; d) positioning a contour gage apparatus, which is independent of the machining apparatus but operationally connected thereto through computer means for providing feedback to the machining apparatus, said contour gage apparatus having a probe tip, whereby the probe tip continuously contacts the actual machined part during the measurement operation; e) indexing the actual machined part and the contour gage apparatus to a defined position for the origin of a predetermined path for measurement; f) performing a scanning operation by sweeping the entire surface of the actual machined part with the probe tip, according to the predetermined path, by changing the positions of the probe tip and the actual machined part relative to each other, for obtaining actual contour data along the predetermined path; g) providing direct feedback of the actual contour data from the contour gage apparatus to the machining apparatus for correction of potential errors in the machining of the part before completing the machining process; h) comparing the actual contour data with ideal contour data and determining an actual disparity between the actual machined part and the ideal part; i) adjusting the machining apparatus in real-time if the actual disparity is greater than a predetermined disparity between the actual machined part and the ideal part; j) performing an additional machining operation on the part to reduce the disparity between the actual part and the ideal part. 16. The method described in claim 15, further including the step of repeating steps c through i as many times as required to obtain a disparity that is equal to or less than the predetermined disparity.
20. The method described in claim 15, further comprising the steps of:holding the machined part stationary; rotating the probe tip; sweeping the probe tip in a meridian sweep pattern over the surface of the machined part; and recording data representing linear positions of the probe tip when the machined part is stationary and after the position of the probe tip is changed with respect to the stationary machined part. 21. The method described in claim 20, further comprising the step of sweeping the probe tip in a plurality of meridian sweeps.
22. The method described in claim 15, further comprising the steps of:holding the probe tip stationary; rotating the machined part around the stationary probe tip for 360 degrees in an azimuthal sweep pattern over the surface of the machined part; and recording data representing linear positions of the probe tip after the machined part is rotated and when the probe tip is stationary. 23. The method described in claim 22, further comprising the step of sweeping the probe tip in a plurality of azimuthal sweeps.
24. The method described in claim 15, further comprising the steps of:rotating the probe tip and the machined part in a predetermined rate of rotation; tracing a spiral sweep pattern with the probe tip over the surface of the machined part; and recording data representing linear positions of said probe tip after the part is rotated and after the position of the probe tip is rotated following the rotation in position of the part. 25. The method described in claim 24, further comprising the step of sweeping the probe tip in a plurality of spiral sweeps.
26. The method described in claim 15, further comprising the step of:indexing the machined part and the probe tip incrementally for individual point measurements; holding the machined part and the probe tip stationary; and performing a scanning operation by sweeping on a point-by-point pattern over the surface of the machined part. 27. The method described in claim 26, further comprising the step of:indexing the machined part and the probe tip incrementally for individual point measurements. Description
In the prior art, rotary encoders are either mounted right on an axis of a turning spindle, or the encoder is directly coupled to the shaft of a motor which controls a gage. In a rotary encoder mounted directly on a spindle, when the spindle undergoes one revolution, the encoder undergoes one revolution. This arrangement prevents accurate resolution of rotary motion of the spindle. More specifically, in 360 rotary degrees there are 21,600 rotary minutes (360�60) and 1,296,000 rotary arc seconds (21,600�60). If it is desired for a rotary encoder to have a resolution of 1 arc second, then the encoder would have to provide 1,296,000 individual increments for a 360 degree revolution. Such a fine resolution is not available in present encoders. It would be desirable, however, to obtain a rotary encoder and corresponding method of use that is capable of providing a resolution of 1 arc second of rotation.
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