Patent ID: 7490394
Filing Date: 2009-02-17
Classification: F16B,Y10T

Abstract:
1. A method of modifying a nut in a nut and screw set to reduce hindered motion between the screw and the nut as a result of thermal expansion of the screw and the nut, comprising the steps of: providing a screw including a plurality of screw threads and having a first coefficient of thermal expansion; providing a nut including a plurality of nut threads and being threadably engagable with the screw, the nut having a second coefficient of thermal expansion and wherein a nut groove having an existing width is defined between adjacent nut threads; calculating the amount of thermal expansion of the screw for a predetermined change in temperature; calculating the amount of thermal expansion of the nut for a predetermined change in temperature; determining a screw/nut thermal expansion amount by adding the amount of thermal expansion of the screw and the amount of thermal expansion of the nut; increasing the width of the nut groove if the screw/nut thermal expansion amount is greater than the existing width of the nut groove.