In order to improve the service life of the needle roller bearing used in a precision cycloid reducer. and to reveal the skew and collision phenomenon of the needle roller bearing. based on the force analysis of the transmission mechanism of the cycloid reducer and considering the friction between the cycloid wheel. needle roller. https://www.roneverhart.com/ESP-LTD-SD-2-Sammy-Duet-Signature-Model-Electric-Guitar-Black-p20045/