Wiredrawing Machines, Slip-Type

Slip-type machines are used for nonferrous wires and finer sizes in ferrous and alloy wires. They are generally wet-drawing, multi-hole machines in which the actual reduction must be greater than the inbuilt speed ratio between successive capstans. Typical slip-type machines are designed to provide at least 3% slip or speed difference at the penultimate block and around 1% additional slip per preceding draft. There is always 0 % slip at the finish or pull-out capstan. The capstan speed should always be equal to or greater than the wire speed at each draft. The hypothetical condition in which capstan speed is less than wire speed is called negative slip, which is an unacceptable condition.