Basically, there are usually fast and slow speed lifts JWM screw jacks, worm gear ratio which is determined. Case in SWL2.5 quickly by P, ratio of 6: 1; Slow represented by M, ratio 24: 1 lift fast when lifting speed: 1450 (input rotational speed) ÷ 6 (ratio) × 6mm (pitch ) = 1450 mm / min when a slow lifting speed: 1450 (input rotational speed) ÷ 24 (ratio) × 6mm (pitch) = 362 mm / min SJ screw jacks, screw jacks, the world's leading endurance is limited by the Texas Haokun Equipment company. Texas Haokun Machinery Co., Ltd. (www.sdnljsj.com) (www.sdnljsj.com) strong, credible, in Dezhou reducer, variable speed machine industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving endurance and innovative ideas will lead you hand into the brilliant, for a better future!