Why do not the use of carbide cutting tools
In addition, in addition to cast iron and relatively high hardness of the workpiece, the wrought iron generally use white steel knife on it.
Because the black planer in addition to hydraulic planer generally do not lift the knife device, in the fast planing and return when the easy collapse of the tool.
And processing materials, high hardness of the workpiece should not be used to quickly planing.
If you use a carbide cutting tool for planing, indicating that the hardness of the material is relatively high.