Abstract
Abstract. In order to meet the demand of high position accuracy, many methods have been developed for measuring the thread profile features of ball screws. However, most of these efforts are limited to measuring a small number of ball screw features and therefore less efficient. In this study, an automatic, non-contact measuring system for the thread profile of a ball screw was developed. It is capable of measuring most common features of the ball screw thread profile and can measure ball screws of different sizes and lengths. The main part of the system is the light curtain which has a high-resolution line-scan CCD camera to measure the projected outer contour of the target. Data points from the thread profile of a ball screw were collected by the measuring system and data pre-processing was performed. Then, the proposed method was used to calculate the most important geometric parameters and errors of the thread profile. The accuracy of the measuring system was verified by testing and evaluating four sets of ball screws from different manufacturers.
Highlights
The reciprocating ball screw mechanism is a force and motion transfer device
The inspection of thread profile usually uses a contour measuring instrument to obtain the profile image of a ball screw and projects the magnified profile image on a screen
Feng et al (2011) developed an automatic measuring system, which was mainly composed of a light curtain and a high-accuracy linear encoder, to calculate the important parameters of thread profile of a ball screw, such as effective diameter and thread
Summary
The reciprocating ball screw mechanism is a force and motion transfer device. By using ball screws, the rotational motion can be transformed to the linear motion with little friction, low noise and high capacity. Feng et al (2011) developed an automatic measuring system, which was mainly composed of a light curtain and a high-accuracy linear encoder, to calculate the important parameters of thread profile of a ball screw, such as effective diameter and thread. Chen et al (2002) developed a measurement method for the contact angle of ball screws by using the photo elastic effect and digital image processing techniques. Rao et al (2013) developed a measurement system based on image processing method to calculate the major diameter, minor diameter, pitch diameter, pitch, thread height and other parameters of screw thread. An automatic, non-contact system for the thread profile of a ball screw was developed It is capable of measuring most common features. The mechanical structure developed can measure ball screws with different sizes and lengths
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