Study On General Shafting Match And Error Correction Of High-precision Tracking Gimbal

With the development of science and technology, photoelectric instruments arebecoming more diverse. A number of high mobile, miniature photoelectronicmeasurement devices are appearing. Tracking gimbal is the core component of opticalmeasuring instruments, and is the base of capturing, tracking, aiming and launching.Small optical instruments require mount be simple, low cost, short production cycleand high accuracy, while the shafting is the key part of the whole precision of mount.To meet the needs of the small tracking gimbal, researches on general shaftingmatching and error correcting of high precision mount are carried out, and the mainworks are as follows:Three gimbal modes are discussed in detail. Based on the main technical indexand characters, a common shafting structure that uses the standard bearings to replacethe grinding bearings in small mounts is proposed. Focused on analyzing the law oferror of the standard rolling bearings in manufacturing process, we put forward thefoundation of error eliminating.Briefly, we study the impact of different errors for shafting precision, and find outthe error sources of the general shafting. The method that became angle error toparallel movement is given for error correcting.A test platform which is similar to the horizontal axis of general shafting is designed. According to self collimation measurement principle, we built theexperimental scheme of shafting error measurement.Fourier harmonic analysis method is used to analyze the measured data. Differenterrors influencing the shafting accuracy are separated out. The vibration of innerringis the main reason of shafting precision. By dealing with five group of measurementresults, we conclude that comparing with two bearings' vibration at the oppositedirection, the shafting precision is improving1times above when at the same, whichverified the feasibility of error correcting method. The precision of general shaftingcan reach within3" after error eliminating. Therefore, the tracking gimbal by usingcommon shafting can meet the demand of small optical instruments.