With regard to the issue of the original motor pulley speed motor one turn, turn 16/18 ring gear namely: 8/9 circle; now one turn the motor, speed reducer turn 20/18 circle, that 10/9 circle If the motor is standard Four motor speed is assumed ideal state of 1500rpm, so when the original speed reducer: 1500x8 / 9 = 1333 rev / min, and now speed reducer:. 1500x10 / 9 = 1667 rev / min over a minute transfer: 334 turn pulley casting porosity defect analysis for the production of various defects pulley large pulley production of castings, cast iron pulleys, timely analysis and discussion, the fan pulley to find out the cause of manufacturing defects, and to take the necessary preventive measures, this pair of 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 the foundry, and therefore have a casting defect, spb pulleys, especially common multiple defects, organization of staff carefully analyzed and discussed, find out the real reason, pulleys, and take practical and effective preventive measures to prevent such defects again, for improving the large pulley casting quality, enhance economic efficiency is very important. 5v-belt pulley, Hengda Machinery (online consultation), the pulley by Texas Hengda Machinery Co. 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.