The dependence of the kinematic accuracy of machines on the set of change gears L.I. Vereina The possibility for increasing the accuracy of gears by choosing a more precise set up of kinematic chains of various models of machines of the same type is investigated for the first time. Examples of using computers for setting up kinematic chains of gear-grinding machines of various models with different sets of change gears are presented. The study has shown that different models of machines of the same type can provide different working accuracy depending on the sets of change gears for two-pair guitars. The results of the research and calculations can be used to improve working accuracy at machine-building enterprises.Keywords: accuracy, kinematic set up of machines. П ри исследовании состав сменных зубчатых колес, входящих в набор, предназначенный для настройки гитар кинематиче-ских цепей металлорежущих станков с ручным управлением, назна-чали из следующего нормального ряда чисел зубчатых колес: 20, 23,