This article discusses a new step-by-step method for making solenoid coils, which involves determining the coil's working voltage, total space, and resistance value of the enameled wire. The article also explains how to adjust the diameter and length of the wire to meet the requirements of use and test the performance of the coil. The article is reprinted from the network and is written by ZhongShan ShiLi Wire Winder Equipments Co.,Ltd, a company that specializes in the production and sales of various winding machines.