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Search Publications by: Johannes A. Soons (Fed)

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Displaying 76 - 100 of 124

Performance Evaluation of a Parallel and a Hybrid Machine Tool

October 16, 2008
Author(s)
Johannes A. Soons, S M. Athavale, R Furness
vances in both the technology and cost of controllers have enabled the commercial introduction of machine tools with a parallel configuration of the positioning axes. In theory, this radical change in design enables improvements in key machine

Stationary and non-stationary deformations in three-flat tests

July 7, 2008
Author(s)
Ulf Griesmann, Quandou (. Wang, Nicolas Laurenchet, Johannes A. Soons
Calibration procedures for optical reference flats of phase-shifting interferometers (three-flat tests) are critically important if flatness measurements with low uncertainty are desired. In these tests, all combinations of three flats with unknown

Three-Flat Test Solutions Including Mounting-Induced Deformations

September 1, 2007
Author(s)
Ulf Griesmann, Quandou (. Wang, Johannes A. Soons
We investigate three-flat calibration methods for circular flats, based on rotation symmetry and mirror symmetry, for absolute interferometric flatness measurements in the presence of deformations caused by the support mechanism for the flats, which are a

A Novel Cooling System to Reduce Thermally-Induced Errors of Machine Tools

June 14, 2007
Author(s)
M A. Donmez, Mahn-Hee Hahn, Johannes A. Soons
This study explores a method to reduce thermally-induced errors of machine tools through temperature stabilization with compressed air. The method uses inexpensive, specialy-shaped, silicon tubing wth small silts. Compressed air forced through such tubing

Form-Profiling of Optics Using the Geometry Measuring Machine and NIST M-48 CMM

January 1, 2006
Author(s)
Nadia Machkour-Deshayes, John R. Stoup, John Lu, Johannes A. Soons, Ulf Griesmann, Robert S. Polvani
We are developing an instrument, the Geometry Measuring Machine (GEMM), to measure the profile errors of aspheric and free form optical surfaces, which require measurement uncertainties near 1nm. Using GEMM, an optical profile is reconstructed from a set

Analysis of the Step-Diagonal Test

June 1, 2005
Author(s)
Johannes A. Soons
The step-diagonal test modifies the diagonal displacement test for machine tool performance evaluation by executing a diagonal as a sequence of single-axis motions. The proposed modification has gained interest because of the claim that the obtained

A Simple Ball Averager for Reference Sphere Calibrations

January 1, 2005
Author(s)
Ulf Griesmann, Quandou (. Wang, Johannes A. Soons, Remi Carakos
When measuring the form errors of precision optics with an interferometer, the calibration of the reference wavefront is of central importance. Ball averaging, or random ball testing, has in recent years emerged as a robust method for calibrating spherical

Improving CNC Machining Accuracy Through Thermal Model-Based Control

July 21, 2004
Author(s)
John L. Michaloski, Frederick M. Proctor, Johannes A. Soons, R King, W Bakula, H Dominguez, N Frampton
The United States Army has a requirement to machine munitions to strict tolerances so that the munitions will launch properly and the explosives will detonate correctly. High precision parts require machine tools to operate with a high degree of accuracy

Improving CNC Machining Accuracy Through Thermal Model-Based Control

July 21, 2004
Author(s)
John L. Michaloski, Frederick M. Proctor, Johannes A. Soons, R King, W Bakula, H Dominguez, N Frampton
The United States Army has a requirement to machine munitions to strict tolerances so that the munitions will launch properly and the explosives will detonate correctly. High precision parts require machine tools to operate with a high degree of accuracy

Characterization of Precision Spheres With XCALIBIR

January 1, 2004
Author(s)
Ulf Griesmann, Johannes A. Soons, Quandou (. Wang
The geometry of a nearly spherical surface, for example that of a precision optic, is completely determined by the radius-of-curvature at one point and the deviation from the perfect spherical form at all other points of the sphere. Measurements of radius