Methodology And Simulation Of The Calibration
Of A Five-axis Machine Tool Link Geometry And
Motion Errors Using Polynomial Modelling And
A Telescoping Magnetic Ball-bar
Author(s)
Y. Abbaszadeh-Mir, J.R.R. Mayer & C. Fortin
Abstract
Many parameters influence the positioning errors of machine tools. Amongst
them are the link geometric errors that describe the relative location between the
machine's successive rotary and prismatic joints and, the motion errors,
describing the non-ideal motion of a joint. A method is proposed that uses a
telescoping magnetic ball-bar to indirectly calibrate these errors on a five-axis
machine tool. The motion error sources are individually modelled as polynomial
functions of each joint coordinates. This modelling method conveniently
incorporates the link geometric errors. Once the polynomial coefficients are
identified, it is then possible to predict the tool versus workpiece position and
orientation errors resulting from these error sources.
Keywords
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