Selection of Measuring Position of Ball-screw Temperature Distribution for Estimation of Thermal Elongation

The optical telemeter system developed is used to measure the temperature distribution of ball-screw and to estimate the thermal elongation of the ball-screw. This paper deals with the selection policy of the measuring position of the temperature. One of the main heat sources is the contact zone between the groove surface of ball-screw and the rolling ball. It is experimentally examined the temperature distribution right under the groove valley and at other positions of the inner surface of hollow ball-screw. It is clarified that the temperature difference due to measuring position within lead length is less than 0.07℃ under the driving condition less than 20m/min table speed. Thus the every position within lead length is available for the temperature measurement to estimate the thermal elongation of ball-screw