The teaching aid presents gear-and-belt transmissions, which can be both as part of the drive and as a separate transmission. Brief general information, the basics of the theory and work of the transfer, the features of the calculation are given in the example of the implementation of a fragment of a course project with gear-and-time transmission, as well as in separate examples with different variants of the initial data, comments and explanations to the calculations are given. The manual is intended for students studying in the mechanical and technological directions of training specialists and engaged in the calculations of transmissions in the implementation of course and diploma projects.