Precision Engineering - SRO 154.
Abstract
For mechanical systems, the basic principles of precision motion have long been clearly enunciated. What is new is the potential for interactive computer use in real-time feedback control, involving (1) structural stabilization of the instrument or machine; (2) movement and location of its parts; (3) processing of metrology information; and (4) positioning and stabilization of th tool/workpiece interactions in a machine tool. This can lead to a distributed, multivariable, multiloop control problem, with significant computation required in the feedback algorithm. Although the advantages of real-time control have been clear for some time, no complete machine tool or metrology system exploits this with the control of the major variables. At present open loop control is being applied, with corrections for calculated (or previously measured) estimates of systematic errors. Closed loop control automatically corrects for unpredictable errors from factors such as mechanical deflections, thermal deformation, and wear. Once in place, a system for precision manufacture can be used for less exacting tasks, offfering reductions of required inspections and assuring part-to-part reproducibility, with reduced rejections. Such a system is at the heart of automated production, yet remains a research area.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1986
- Accession Number
- ADA166084
Entities
People
- Clarence J. Maday
- Michael D. Bryant
- Richard F. Keltie
- Ronald O. Scattergood
- Thomas A. Dow
Organizations
- North Carolina State University