Measuring And Modelling Heat Transfer And
Thermal Errors On A Ballscrew Feed Drive System
Author(s)
S. Fletcher & D.G. Ford
Abstract
Machine tool axes continue to employ rotary encoders mounted on the drive
motors for position feedback. With this method the accuracy of the ballscrew
determines the positional accuracy. Errors associated with expansion of the
ballscrew caused by internally generated heat are well documented and have
been found to be significant. The accuracy demands on even low cost machine
tools continues to increase, requiring the manufacturing industry to invest more
effort in understanding the capabilities of their machines. Many companies
regularly calibrate machne tools using quick check Ballbar techques or,
perhaps less frequently, laser interferometry to quantify the errors. However,
thermal errors associated with operation of the machme are not normally
indicated using these techniques. The IS0230 part3 standa
Keywords
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