The Science of and Advanced Technology for Cost-Effective Manufacture of High Precision Engineering Products. Volume 1. Automated Detection and Error Compensation of NC Workpiece Position.
Abstract
The purpose of the research was to develop methods which will: 1) Locate, by means of a touch-trigger probe, planes and cylinders on a workpiece, 2) Using the location, determine the error between the desired and actual location of the workpiece, and 3) Compensate for the errors so that further machining can take place. In the reported work equations which can fit a plane to the probe measurement by minimizing the sume of the squared errors are used to locate the plane. These equations are well known from linear regression theory. The same principle is used to fit a skewed cylinder to a set of measurements. Using a matrix formulation, expressions for the errors between the fitted surfaces and the desired surfaces are given. These errors are used as the input to two compensation methods: one forces the desired tool/workpiece alignment by using the machine to realign the workpiece, while the other alters the NC program so that subsequent machining operations will be correctly specified. Computer programs to fit surfaces, compute the errors, and accomplish the compensations were developed. Computer runs were made using simulated probe data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA161656
Entities
People
- A. L. Sweet
- David Noller
- Moshe M. Barash
Organizations
- Purdue University