A General Purpose Thermal Error Compensation System
For CNC Machine Tools
Author(s)
A.J. White, S.R. Postlethwaite & D. G. Ford
Abstract
A general purpose thermal error compensation
system for CNC machine tools
AJ. White, S.R. Postlethwaite & D.G. Ford
University of Huddersfield, UK
Abstract
Thermal effects cause the majority of machining errors on many types of
machine tool, with linear expansion and distortion of the structural elements
causing unwanted movement between the tool and workpiece. Heat inputs that
cause temperature elevation and gradients come from many sources internal and
external to the machine tool and make thermal errors difficult to control without
some form of compensation. Many thermal error modelling and compensation
systems have been proposed which use neural networks, multi-regression
analysis, heat modelling or probing techniques. However, each method suffers
from one or more major drawbacks that limits its effectiveness when used in a
practical machining environment. One feature of all the thermal error
compensation techniques is their lack of flexibility that makes them difficult t
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