Motor speed and pulley diameter than the speed of the conversion ratio = output speed: speed = input load pulley pitch circle diameter: Motor pulley pitch circle diameter pulley casting porosity defect analysis for the production of various defects pulley large pulley production of castings, timely analysis and discussions to find out the cause of manufacturing defects, and to take the necessary measures to prevent, Jilin pulleys, which pulleys casting quality is very important work. Due to the large pulley casting repair casting defects caused economic losses caused by the scrap, generally 5% · 10% of the total value of foundry, pulleys design, so casting with defects, especially common multiple defects, organization of staff carefully analyzed and discussed, to identify the real cause, and take practical and effective preventive measures, pulleys drawings, to prevent such defects again, for improving the large pulley casting quality, enhance economic efficiency is very important. b3 pulleys, Hengda Machinery (online consultation), Jilin pulley by Texas Hengda Machinery Co., Ltd. Texas Hengda Machinery Co., Ltd. (www.sddzhdjx.com) (www.sddzhdjx.com) Shandong Dezhou, machining leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. In Hengda Machinery leadership with the staff warmly welcome all inquiries negotiations to create a better future Hengda machinery.