Cross-hole machining has always been a problem in milling and drilling. Due to the appearance of the intersecting holes, the drill bit is prone to bending or knifeing when machining the second hole. A new product part of our factory is a 25 mm × 25 mm × 20 mm square. There are two sides on the side with a side length of 25 mm × 20 mm. ? 12 mm cross-through hole. The structure is shown in Figure 1. figure 1 We usually consider drilling or milling for the processing of holes, which is convenient and quick to process. But the difficulty here is the processing of the two crossed holes, especially the second hole. Under the premise that there is a through hole, the second hole is reworked, and the knife needs to have good rigidity to be positioned. Otherwise, the second hole may be deflected, and the tool may be broken more seriously. In addition, the center line of the two holes To maintain the same plane, there is also a requirement for verticality, which is difficult to achieve on a drilling and milling machine. After several rounds of discussion, it was finally determined that the machine was machined, the workpiece was rotated and the tool was not moved, thus ensuring the rigidity of the tool and designing a special tooling, thereby solving the above problems better. Figure 2 Tooling assembly drawing 1. Platen tightening bolt 2. Pin 3. Platen 4. Workpiece 5. Positioning plate 6. Tooling 7. Coupling bolt 8. Compression bolt Summary: This artifact seems simple, but through the conversion of thinking, the cross-hole machining problem is solved by drilling and milling into machining. Therefore, in machining, we need to change our thinking and consider a variety of processing methods to determine the best solution to the problem. The mechanical concealed cistern is a common bathroom fixture that stores flush water and controls flushing. It is usually installed in the wall, and there is only a button on the outside to start the flush. Its design makes the water tank no longer occupy the toilet space, thus providing more free space and beautiful appearance. Mechanical Concealed Cistern, Concealed Flushing Cistern, Toilet Flush Tank, Build In Toilet Cistern Guangdong Fabia Intelligent Technology Co., Ltd , https://www.fabiaintelligent.com
After discussion, the final decision was made on the C616 lathe, and the design tooling is shown in Figures 2 and 3. 
The tool presses the workpiece by the pressure plate 3 and the pressing bolt 8 to position the two sides of the positioning plate 5, and clamps the working body 6 with a three-jaw self-centering chuck during processing, and places the workpiece in the middle of the positioning plate 5. Hole, tighten the two compression bolts 1 and 8. When machining the first hole, pay attention to the fact that after the workpiece is hooked with the wire, the two 25 mm × 25 mm faces of the workpiece must not be interchanged when the workpiece is clamped again, because the workpiece positioning surface is the first 25 mm × 25 mm. Face, if the face-to-face is different due to different machining standards, the cross-holes of the two machines are processed differently. 
Figure 3 3D illustration of tooling
Space-saving: The design of the mechanical hidden water tank allows the water tank to be installed inside the wall, saving valuable bathroom space, providing more free space and a beautiful appearance.
Beautiful: The design of the hidden water tank makes it no longer stand in the bathroom like the traditional surface-mounted water tank, thus improving the overall aesthetics of the bathroom.
Water saving: The mechanical hidden water tank can precisely control the water volume when flushing, avoiding excessive consumption of water resources, thereby reducing water usage and saving water bills.
Long service life: Compared with the traditional surface-mounted water tank, the mechanical hidden water tank has a longer service life and lower maintenance costs because it is more concealed and less susceptible to external factors.
More hygienic: The traditional surface-mounted water tank needs to be cleaned frequently, and the scale and sundries hidden inside the water tank are not easy to be polluted by the outside world, so it is more hygienic.