1/8”Φ以下的鐵丝或铜丝都可用下法拔直结果和装有滑输的拔直车没有两样。法用3/16“—1/4’Φ厚紫铜管长约200m＇m,照下图在中央彎—圆弧,使A的部份小於鐵丝的直径,卽使A=O也无妨,倘彎得太多拉時反而费力,将铜管一端夹在车床三脚轧盤中,把鐵丝从车頭穿过铜管用钳子 1/8 “Φ below the wire or copper wire can be used under the law straight results and equipped with sliding straight pull vehicle is no different. Law with 3/16” -1 / 4’Φ thick copper pipe about 200m ’ m, according to the figure in the Central Bend - arc, so that part of A is less than the diameter of the wire, 卽 so that A = O anyway, if too much time to bend over but laborious, one end of the brass clamp in the lathe tripod rolling Plate, the wire from the front through the brass with pliers