The core shaft is used for inspecting workpieces, and this standard is divided into three types of taper. Namely: 1:3000.1:5000, 1:8000 When ordering, according to the example: ￠ 10N6 hole can be selected with ￠ 10X length 105-1:3000

Small cone core shaft extension use: For some unequal diameter holes with larger aperture and higher coaxiality requirements, the commonly used method for machining on a horizontal boring machine is to select a suitable tool holder and tool, move the worktable towards the spindle direction, and machine the hole near one end of the spindle. Keep the workpiece still and move the machine tool worktable away from the spindle, facing away from the cutting edge to machine the other end hole. By using this method, the workpiece can be clamped once, theoretically ensuring the coaxiality of the hole. However, due to the gap between the inclined iron and the guide rail during the adjustment of the machine tool, it is easy for the centerline to not coincide when the worktable moves forward and backward, resulting in the coaxiality of the hole system exceeding the tolerance. In addition, due to the back facing cutting, the tool holder and tool cannot be withdrawn from the hole, which is inconvenient for measurement and also affects the machining accuracy and production efficiency of the hole. Therefore, for holes with relatively large aperture and high coaxiality requirements, the small cone axis alignment method can also be used to ensure the accuracy requirements of the workpiece and improve production efficiency. Practice has proven that small cone core shafts can not only be used to solve the coaxiality problem of workpieces on lathes, but also ensure the coaxiality of parts on boring machines.