"Boss, these are the gears and bearings I made. What do you think." Jack's face was excited, pointing to the large and small gears and several bearings placed on the iron workbench. Said.

　　 Ishikuma picked up two gears of different sizes and looked at it carefully.

　　 These two gears, one large and one small, are obviously just cast, and they have not even been polished. However, Shixiong put these two gears together and meshed with each other, and found that although the two gears are not the same size, the meshing between the gears is very good.

"Boss, I used the formulas you gave me to calculate carefully, and then I got some data, and then I opened the mold based on the data, and got these gears. Before you came, I simply tried these Gears, the effect is very good. If you sharpen it again, the meshing effect between each other will be better."

"Okay! Jack, these gears you made are very good, at least I don't see any problems. But you need to carry out rigorous experiments and long trial runs before you can actually use these gears, otherwise problems will easily occur. ."

　　 "Don't worry, I will definitely carry out rigorous experiments and long-term test runs. After all, these things are all used in hydraulic machinery. Once a small error occurs, it will cause a lot of loss."

　　 Ishikuma put down the gears in his hand with satisfaction. In any case, he could see that these gears were absolutely carefully calculated and cast. Although Shi Xiong is not very proficient in this aspect of knowledge, he has also learned related things somehow, and these gears feel very good.

　　 He picked up another bearing casually.

　　 These are cylindrical roller bearings with large heads, but compared to gears, this kind of large cylindrical roller bearings is a bit unsightly.

　　 Whether it is the inner ring or outer ring of the bearing, or the cylindrical roller inside, the machining process can be seen to be very rough, and there are even two cylindrical rollers that can be seen to be irregular with the naked eye.

　　 Shixiong squeezed the bearing with his hands and said, "Jack, our processing technology still needs to be improved. I am afraid that bearings with this precision will have to be scrapped in a short time."

Jack Williams' face immediately flushed, and he whispered: "Boss, I need time to improve the processing technology, but now this bearing in your hand can be said to be the best bearing... ...."

　　 Ishikuma nodded slightly, but said nothing.

　　The time for the appearance of the bearing is not short. The early transportation method of placing a row of wooden poles under a row of skid plates is actually the earliest form of linear motion bearing. When Shixiong made an oil press last year to transport the trunk of that big oak tree from halfway down the mountainside, a lot of logs were placed on the base of the trunk. In fact, the principle of linear motion bearings was used.

Leonardo also described ball bearings in the early sixteenth century. The "cage ball" bearings described by Galileo in the seventeenth century were actually the earliest rolling bearings with cages; and at the end of the seventeenth century, The British Warlow has designed a real ball bearing.

　　 Don't look down on this thing, but it occupies the same irreplaceable position as gears in mechanical manufacturing. However, the accuracy requirements of bearings are much higher than those of gears. At least in the modern era, the accuracy requirements of bearings are much higher than those of gears.

　　 The gears that Ishikuma saw just now were also cast, but those gears can be used on some low-speed mechanical equipment as long as they are slightly polished. Although the bearing in hand is a cylindrical roller bearing, the machining accuracy is not as high as that of a ball bearing, but the machining accuracy of this bearing obviously cannot meet the requirements.

　　 However, Stone Bear can also understand the problem that Jack is facing. After all, this is an Indian tribe, which can be said to be a poor place. It is already very good to be able to make the bearing in his hand here, and Shixiong has no way to ask Jack to make a better bearing under the current circumstances.

At present, the metal processing capabilities of the Gaoshu tribe are only the most primitive sand mold casting and hammer forging. Other thermal processing conditions such as injection casting, die casting, spin casting, and directional solidification are simply not available. Have, let alone cold working processes like cold rolling, cold drawing, cold forging, stamping, and cold extrusion.

　　 As for precision casting, it is something that only exists on paper.

You are expecting to use sand mold casting to cast precision metal parts that can only be obtained by precision casting. That is purely a joke. If you want to forge precision workpieces with a hammer, it is better to use sand mold casting...ァ新ヤ~ ⑧~1~中文网ωωω.χ~⒏~1zщ.còм

　　 However, under the guidance of Ishikuma and Ferguson, Jack is currently preparing to try the lost wax method. In other words, the lost wax method is the highest purity metal thermal processing technology that can be achieved under current conditions.

　　 knows that this kind of thing is impatient. Just like the previous life, the metal processing technology has been improved and upgraded for hundreds of years, and the processing accuracy still has such limitations. This thing is the most basic thing. If you want to be anxious, you can't be anxious, you can only take it step by step.

　　 But Shi Xiong also understands that if he has a golden finger, this process will inevitably be greatly shortened, but it is also not anxious.

　　 It seems that the bearing in my hand ~lightnovelpub.net~ belongs to the kind of bearing with a stop on the outer ring. The inner ring and the outer ring are casted fairly well. At least the two rings look very round.

　　 But the rolling elements inside are the fifteen cylindrical rollers, which is really a bit horrible.

　　Bearing is a support body that supports the rotation of machinery. Whether it is high-speed or low-speed rotation, the friction coefficient and rotation accuracy of rotation are strictly required. The smaller the friction coefficient and the higher the rotation accuracy, the better the bearing.

　　 But whether it is friction coefficient or rotation accuracy, it is basically the machining accuracy of the bearing as a whole, especially the rolling elements.

　　 But for the cylindrical roller of this bearing that Jack made, the machining accuracy error is really visible to the naked eye. It is no exaggeration to say that this kind of cylindrical roller is like later generations cutting a steel bar into several sections and then stuffing it between the inner ring and the outer ring of the bearing. Starting

　　 Ishikuma can only helplessly shook his head: "Jack, try to use the lost wax method to cast this cylindrical roller."

Although the lost wax method was used to cast bronzes in ancient China, it is undeniable that the casting accuracy of the lost wax method is much higher than that of ordinary sand casting.

　　 Even Ferguson used the lost wax method when casting the barrel of the new rifle.

　　 "Well, pay attention to communicate with Ferguson. He has a deep understanding of this casting process."

　　Jack quickly nodded his head to show that he knew...

　　Ps: Bow and thank "I gave my hand to the first kiss" for the two thousand rewards!

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