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Manufacturing

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Displaying 326 - 348 of 348

Rapid Prototyping

January 1, 1998

Author(s)

Kevin K. Jurrens

Continued growth and acceptance of rapid prototyping (RP) will come only if the technology reaches a broader base of users. For this to happen, it must become easier for companies to measure the benefits of RP and justify its costs. Today, measuring the

Proceedings of the Third NIST Workshop on the Development of Machine Tool Performance Models and Data Repository

November 1, 1997

Author(s)

Alice V. Ling, M A. Donmez

This report summarizes the presentations made by NIST researchers and other industrial and academic collaborators about their technical progress on development of machine tool performance models and data repository. This document also contains the summary

Thermal Error Modeling of Machine Tools Using Neural Networks

September 18, 1997

Author(s)

Alice V. Ling

This paper describes an approach for the enhancement of machine tool accuracy. A prediction of the thermally-induced displacement error of the cutting tool with respect to the workpiece is used for corrective action. Recently, researchers have increased

Measurement and Analysis of Quasi-Static Hexapod Errors

July 17, 1997

Author(s)

Johannes A. Soons

This paper describes the measurement and analysis of the quasi-static errors of a prototype hexapod milling machine at NIST

Friction drive for ultra-precision machine tools: interface compliance-based model

April 22, 1997

Author(s)

Bradley N. Damazo, Alex Slocum, A Gee

The roller/bar friction-drive is an example of a high-precision rectilinear actuator. The roller/bar friction drive offers control advantages of low backlash and dead-band due to elastic averaging within the Hertzian contact region. It also offers

Error Analysis of a Hexapod Machine Tool

April 3, 1997

Author(s)

Johannes A. Soons

This paper describes the measurement and analysis of the quasi-static errors of a prototype hexapod milling machine at the National Institute of Standards and Technology (NIST). Emphasis is placed on a) the identification and definition of the parametric

PIECS - A Software Program for Machine Tool Process-Intermittent Error Compensation

May 1, 1996

Author(s)

Herbert T. Bandy, David E. Gilsinn

This report documents software, called PIECS, that performs process-intermittent error compensation for a turning center. The program is a part of a larger three loop control architecture that includes a real-time geometric-thermal error compensation loop

Development of Virtual Machine Tools

January 1, 1996

Author(s)

M A. Donmez

This paper describes a new project that is part of a program initiated by the Manufacturing Engineering Laboratory of the National Institute of Standards and Technology (NIST) to develop infrastructural tools that facilitate information-based manufacturing

Compensation of Errors Detected by Process-Intermittent Gauging

August 10, 1995

Author(s)

Herbert T. Bandy, David E. Gilsinn

This paper describes a software design for implementing compensation of errors detected by process-intermittent gauging. This is the function of one control loop in the three-loop Quality In Automation (QIA) architecture that is under development at the

The effects of Spindle Dynamic Characteristics on Hard Turning

May 1, 1995

Author(s)

Kari K. Harper, Yoichi Matsumoto, Alkan Donmez, Matthew A. Davies

Texture-Independent Vision-Based Closed-Loop Fuzzy Controllers for Navigation Tasks

April 1, 1995

Author(s)

S R. Kundur, Daniel Raviv

This paper deals with vision-based closed-loop control schemes for collision avoidance as well as maintenance of clearance in a-priori unknown textured environments. These control schemes are based on fuzzy logic and employ a visual motion cue, we call the

CMAC Neural Network Control for High Precision Motion Control in Presence of Large Friction

January 1, 1995

Author(s)

G Larson, Alkan Donmez, S Cetinkunt

Data Management for Error Compensation and Process Control

January 1, 1995

Author(s)

Herbert T. Bandy, David E. Gilsinn

Strategies for managing data flow are described for a system which controls processes to compensate machine tool and process errors. A CAD representation of the part is the basis for generating the data used in the processes and analyses. A process

A New Method to Calculate Looming for Autonomous Obstacle Avoidance

November 1, 1994

Author(s)

K Joarder, Daniel Raviv

Vision, Robotics & Intelligent Systems, Mobility, Control

An Adaptive Error Correction Method Using Feature Based Analysis Technique for Machine Performance Improvement ? Part 1: Theory Deterioration

November 1, 1994

Author(s)

J Mou, S Cetinkunt, Alkan Donmez

An adaptive error correction method using a feature-based analysis technique for improving the accuracy of CNC machine tools is presented. The method described in this paper emphasizes the integration of the process-intermittent gauging and analysis

An Adaptive Error Correction Method Using Feature Based Analysis Technique for Machine Performance Improvement ? Part 2: Experimental Verification

November 1, 1994

Author(s)

J Mou, S Cetinkunt, Alkan Donmez

The development and derivation of an adaptive error correction method using an interactive inspection system and feature-based analysis technique for machine performance improvement were presented in Part I of this paper. Here, in Part II, the experimental