Cutter for processing nick of drop hammer sample

The utility model provides a cutter for processing a notch of a drop hammer sample, which comprises a cutter head, a first bevel gear arranged on the cutter head, a plurality of second bevel gears arranged on the periphery of the first bevel gear, the second bevel gears meshed with the first bevel gear, a sliding cutter holder arranged on the second bevel gears, the cutter holder mounted on the cutter head, and a triangular prism-shaped grooving cutter arranged on the cutter holder. And the groove cutter is provided with three blades. The whole grooving cutter is in a triangular prism shape, the grooving cutter is provided with three cutting edges, the angle of each cutting edge is 45 degrees, and each cutting edge is relatively independent. When one of the cutting edges is damaged and tipping occurs, the bolt is detached, the grooving cutter is rotated by 120 degrees, and the other cutting edge is continuously used, so that the cutter is repeatedly used, the use cost of the cutter is reduced, and the working