Patent ID: 7854575
Filing Date: 2010-12-21
Classification: B23Q,G01B,G05B,Y02P,Y10T

Abstract:
1. A displacement and deflection measurement device for a main spindle for a machine tool which comprises: a main spindle that is moved by a numerical control and is mounted on a bed; a tool which machines a work supported on a work supporting device and is mounted on the main spindle through a tool holder, the displacement and deflection measurement device comprising: a fluid injection nozzle mounted on the bed or the work supporting device; a fluid supply source that supplies fluid to the fluid injection nozzle; a measurement unit that measures pressure or flow rate of the fluid in a fluid passage defined from the fluid supply source to the fluid injection nozzle; a thermal displacement calculating unit that calculates a thermal displacement of the main spindle on the basis of a change in the pressure or the flow rate of the fluids which is measured by: a rotational deflection calculating unit that calculates a rotational deflection of the tool holder or the tool on the basis of a change in the pressure or the flow rate of the fluid, which is measured by: