Cut off the profile (Figure)

Cut off the knife. The shape of the cutting blade is similar to that of the grooving knife, but it is easy to break because the cutting head is narrow and long. Commonly used cutting methods are straight-forward method and left-right borrowing method, as shown in Figure 1. The straight-through method is often used to cut brittle materials such as cast iron; the left and right borrowing method is often used to cut plastic materials such as steel.

Figure 1 cutting method

Pay attention to the following points when cutting:

1) Cutting is generally performed on the chuck, as shown in Figure 2. The cutting point of the workpiece should be closer to the chuck to avoid cutting on the top mounted workpiece.

Figure 2 cut off on the chuck

2) The cutting edge must be at the same height as the center of the workpiece. Otherwise, there will be a boss at the cutting point and the cutting head will be easily damaged (Fig. 3).

Figure 3 The cutting tool tip must be equal to the center of the workpiece

3) The length of the cutting knife extending out of the knife holder should not be too long, and the feeding should be slow and even. When cutting off, the feed rate must be slowed down to prevent the cutter head from breaking.

4) When cutting steel parts, it is necessary to add cutting fluid for cooling lubrication. When cutting cast iron, generally no cutting fluid is added, but if necessary, kerosene can be used for cooling lubrication.

5) When the two top workpieces are cut, they cannot be cut directly to the center to prevent the turning tool from breaking and the workpiece flying out.

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