Abstract
At the spindle unit, thermal deformation is rapid, because the spindle unit has a small thermal capacity. There is highly relationship between temperature and deformation. However, it is difficult to measure temperature directly when the spindle is turning. And also it is difficult to measure temperature directly that is closer to a heat source. Rapid thermal deformation is caused by variation of rotation speed of spindle. Estimating method is developed used the temperature distribution. And other methods are studied. The study proposes the method to estimate thermal deformation from a number of rotations histories.
