1, the focus on the surface of the plate
This way has become the focal length of 0, when the focus of the cutting machine used in the workpiece near the surface, this model of the workpiece under the surface smoothness is not the same, in general, close to the focus of the cutting surface is relatively smooth, and away from the cutting focus The lower surface appears rough. This mode should be based on the actual application of the upper and lower surface of the process requirements.
2, the focus in the plate inside
This way also becomes a positive focal length. cutting machine When you need to cut the workpiece for the stainless steel or aluminum plate when the cutting point is often used in the workpiece inside the model. However, one of the drawbacks of this approach is that the cut surface is larger than the cutting point on the surface of the workpiece due to the principle of the focus, and the cutting flow required in this mode is large and the temperature is long enough to cut the punching time slightly longer. cutting machine So when you choose the workpiece material is mainly stainless steel or aluminum lamp hardness of the material when used.
3, the focus on the plate above
In this way we also become negative focal length, because the cutting point is not located in the cutting material surface is not located in the cutting material inside, but located in the cutting material above. cutting machine This method is mainly used with cutting the thickness of the material. This way the focus is located in the cutting material above the main, because the thick plate needs to cut large, or the nozzle of the oxygen is likely to lead to lead to lead to insufficient cutting temperature drop. But one of the drawbacks of this approach is that the cutting surface is relatively rough, not very practical for high precision cutting
In short, cutting machine the focus should be different depending on the material being cut.