Abstract
Harvesting machines of modern cotton pickers are equipped with spindle drums, making rotational movements against the direction of machine motion. To ensure the natural position of the bushes with bolls in the working area of the vertical spindle apparatus, the linear speeds of the spindle centers on the drums advance the speed of the machine. The aim of the paper is to develop a methodology for calculating the lead coefficient depending on the parameters of the drum, spindle, its activity, and frontal location, where the active surface of the spindle should be located opposite the cotton plant. Specific recommendations are given for calculating the operating modes of a cotton picker.
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