In modern manufacturing, the main workpiece error results from spindle ther
mal deformation. We introduce a method to measure spindle thermal deformati
on using three single-beam interferometers. Ours is a noncontact, real-time
measurement method that can be carried out while the spindle is rotating.
An experiment is performed on a vertical machine center, and a measurement
uncertainty of 1.0 mu m is obtained for a spindle thermal deformation of 50
mu m. (C) 2000 Society of Photo-Optical instrumentation Engineers. [S0091-
3286(00)01808-0].