First of all, triangular threads are divided into metric threads and English threads. According to the diagram, it is specified whether the metric pitch or the British number of teeth per inch determines the change gear.

Second, if it is metric, such as M 16X2, find the gear corresponding to 2 in the metric mm column, and hang it to see if the gear in the meshing diagram matches. Just hang the screw position in the gear position according to the figure.

Thirdly, if it is in English, for example, the English pipe thread R 1 is an inch pipe thread, and every inch 1 1 tooth, just find the gear corresponding to 1 1 in the English1n' column and adjust the gear position in the gear bitmap. Some machine tools have the same gearbox and speed change gears.