Regulagem de colhedora is a simple Android app that helps with the calibration of the molinete speed in harvesters. The app uses the Embrapa 20-second methodology and calculates based on the molinete index. The molinete plays a crucial role in conducting plants against the cutting bar and then to the feeding snail. It must move the crop smoothly and uniformly, avoiding excessive friction that can lead to cob threshing. The app provides guidance on the following molinete settings: horizontal and vertical positioning, and rotation speed. It also offers tips on regulating the cylinder, including the opening between the cylinder and the concave. The app is designed for easy use and provides accurate results, making it a valuable tool for farmers and farm workers.