Method of assessing three dimensional volumetric errors in multi

Details Method of assessing three dimensional volumetric errors in multi Method of assessing three dimensional volumetric errors in multi

1997-05-30

1998-11-24

Trammell, James P.

Boots, shoes, and leggings

702182, 36447402, 73 379, 33503, B23Q 1518

Patent

active

058416684

ABSTRACT:
A method of assessing three-dimensional volumetric errors of multiaxis machine tools in three-dimensional working space is disclosed. Each three-dimensional volumetric error component can be systematically measured and analyzed on the modeling of polynominal functions in accordance with the volumetric errors and the kinematic chain in accordence with the corresponding machine tool. The method inputs the measured radial data performed on the three orthogonal planes, analyzing the parametric errors such as positional, straightness, angular, squareness, and backlash errors. The positional error components along each of three orthogonal axes are modeled as a dimensionless polynominal function with corresponding positional error coefficients. The method also can assess dynamic performance of the machine tools such errors due to the servo gain mismatch. The method employs the kinematic ball bar to assess the volumetric errors.

REFERENCES:
patent: 5257460 (1993-11-01), McMurtry
patent: 5691904 (1997-11-01), Lysen
patent: 5726896 (1998-03-01), Jia et al.
Abstract by Pahk et al.; "New technique for volumetric error assessment of CNC machine tools incorporating ball bar measurement and eD volumetric error model"; International Journal of Machine Tools and Manufacture vol. 37, n11, Nov. 1997.
"A Simple Method For Testing Measuring Machines and Machine Tools" by J.B. Bryan (Precision Engineering, vol. 4(2), 1982).
"Test of the Three-Dimensional Uncertainty of Machine Tools and Measuring Machines and its Relation to the Machine Errors" by Knapp, W. (Annals of CIRP, vol. 32(1), pp. 459-464 No Date.
"On Testing Coordinate Measuring Machines (CMM) with Kinematic Reference Standards (KRS)" by Kunzmann H., et al. (Annals of CIRP, vol. 32(1), pp. 465-468, 1983.
"The Measurement of Motion Errors of NC Machine Tools and Diagnosis of Their Origins by Using Telescoping Magnetic ball bar Method" by Kakino, Y., et al. (Annals of CIRP, vol. 36(1), pp. 377-380, 1987).

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