Bball screws are manufactured by institute of applied research, a pune-based organisation . Depending on the accuracy, ball screws are divided in the following categories: a] precision grade; b] general grade and c] transport grade. Following are some technical features of these ball lead screws: the accuracy grade of these is 10 as per din 69051, i e 0.010 mm lead error in 300 mm threaded length; . They have high stiffness and high efficiency. Sliding friction in conventional lead screw is replaced by rolling friction in ball screws which leads to. This results in the increase of transmission efficiency and needs very low driving power. The torque requirement is one-third of the conventional lead screw. The rolling contact of the steel ball between screw and nut, results in longer life of ball screws without reducing its original accuracy which . This eliminates frequent compensating adjustments in machine slides. The rolling of the balls minimises tthe starting friction is minimized by the rolling of the balls and tendency of inertia while fast positioning is eliminated. Through rolling contact, vvery small accurate increments of movements may be obtained, which leads to through rolling contact. This results in a tremendous increase in tool life in machine tool slide applications. High load causes mminimum heating up is caused by high load which means better positioning accuracy. Iar ball screws are preloaded with double nuts to eliminate axial play, to increase overall stiffness and to improve positioning accuracy. These ball screws find their applications applications of ball screws are as follows: used in precision machine tools, milling, tuning, drilling, boring, shaping, edm, tool grinder and gear grinding machines. Temperature range of operation of these ball screws is -20 to 120 deg c. Depending on the accuracy, ball screws are divided in the following categories: a] precision grade; b] general grade and c] transport grade. The nature of internal deflection of iar ball screws minimises fatigue and end up with longer life.
