The Huang family set up two large tables and served meals separately.

Huang Chengyan, Huang Yueying, Sun Yu, and Hua Tuo sat at one table, and Zhuge Liang, Xiao Pangtong, Xiao Xu Shu and Sima Hui and others who had just run out of the backyard sat at another table.

Huang Chengyan and Huang Yueying have decided to join the Gongsun family, so there is no need to stay in this family, they take out all the good things in the family to entertain, and it seems that they plan to pat their butts and leave after this meal. Anyway, the house is surrounded by walls, except for the strange furniture designed by Huang Yueying, there is nothing worth taking away.

After the initial embarrassment passed, everyone ate a meal, and the atmosphere at the table slowly improved.

Sun Yu couldn't help but open his mouth and said to Huang Yueying: "Miss Huang, what are you doing with these strange gear sets?" ”

Huang Yueying smiled slightly: "Last time, Mr. Xunzhen taught me this kind of gear, the more I think about it, the more I think it is widely used, because I try to install all the things around me with a gear set to try, I also know that some things are not suitable for this thing, but it is always good to try more." ”

Sun Yu nodded, he was engaged in scientific research and invention in later life, of course, he knew the important surname of experiment, when a new equipment was invented, it was necessary to test its practical surname in various fields, which was an inevitable step for a scientist.

For example, in later generations, there is a station called the starting point Chinese network, where if the authors think of an ability for the protagonist, that is, Goldfinger, they have to think about what the protagonist can do with this ability, which is also practical surname research...... Ahem! Even the author has to do practical surname research, and it is normal for Huang Yueying to do it.

It's just that the gear thing is too pediatric in Sun Yu's eyes, so he didn't expect Huang Yueying to test its generic surname at all. Now that Huang Yueying said it, she found that she was making a fuss.

Huang Yueying saw Sun Yu nodding in support, and immediately felt a burst of joy, she is a woman who likes to engage in invention and creation, and now with Sun Yu's monster by her side, she has long wanted to ask him for advice, and now she has been affirmed by him, so she quickly moved out her difficult problems: "Mr. Xunzhen, I recently found a problem when I was studying the gear set, I originally used wooden gears, but the bite force of the gears was very strong when they rotated, so they collided with each other and wore out very much. Wooden gears have a very short lifespan, so I wanted to make them into iron gears. ”

She spread her hands and said, "It's not difficult to make individual iron gears, but iron gears can't be nailed together, and it's hard for me to combine them into a gear set. ”

Oh, this is not a big problem, Sun Yu understood as soon as he heard it, there were no screws and screw caps in this era, and if you want to connect two iron appliances closely, the means are very poor, and you can only use cow tendon to be entangled, but when the gear set is transported, the bite force is very large, and the cow tendon is unreliable.

At the end of the day, screws and caps are what you need to make the perfect use of gears. It's just that...... In this day and age, how can I make a machine tool that can precision machine spiral patterns? This is completely unrealistic.

Forget it, I will briefly talk about this to Huang Yueying to inspire her thinking, but I also told him the difficulty of processing spiral patterns, so that she can retreat from the difficulties, scientific research must also be done according to her ability, it is not possible to be too ahead of the times.

Sun Yu put on a serious face, then asked nm01 to project an iron screw and screw cap on the wall, and then asked nm01 to show the combination of screws and screw caps in an animated way.

This strange thing immediately attracted Huang Yueying's attention: "This thing called a screw is really powerful, through the combination of these spiral concave and convex, two metal objects can be tightly combined, which is much stronger than ordinary nails, Mr. Xunzhen, you are awesome, how did you come up with this thing?" ”

"Ahem, I don't know how I came up with this thing." Sun Yu replied casually, of course, he didn't talk nonsense, who invented the screw, what era it was invented, he didn't know, in fact, no one was interested in caring about how this kind of thing that would not look up and look down in later generations appeared in the world.

Huang Yueying sighed and said, "This thing is really powerful, but I found a problem, this spiral pattern...... It seems difficult to do. ”

Sun Yu thought to himself: You know the goods, without a machine tool, it is impossible for us to make screws and nuts that can be tightly screwed together.

So Sun Yu sighed: "Yes, the processing of this screw pattern is very difficult, if you let the blacksmith of this era take action, it is impossible to carve a uniform spiral pattern on the iron nails, so this invention is useless for the time being." ”

Unexpectedly, as soon as Sun Yu's words fell, Huang Yueying said curiously: "I don't think it's difficult to carve on iron nails, but the difficult thing is how to draw a perfect spiral on the nails." ”

Sun Yu said with a smile: "It's very simple to draw a spiral pattern, find a white piece of paper, draw two parallel lines that are very close to each other on it, and then wrap the paper strip diagonally around the iron nail, these two parallel lines can become a perfect spiral pattern, just carve along these two parallel lines." But whose hand is so steady? Steady carving along parallel lines on small iron nails? ”

Sun Yu is not afraid to put forward the concept of parallel lines, in fact, the concept of parallel was proposed very early in China, many ancient poems and books have mentioned the word parallel, he believes that the clever Huang Yueying will be able to understand.

Huang Yueying really understood, her eyes lit up, and she was overjoyed: "Sure enough, you can use this method to trace the perfect spiral pattern on the iron nail, haha, great!" Mr. Xunzhen, you don't have to worry about the problem of unsteady hands, leave this matter to me. ”

Huang Yueying said to do it, she dragged Sun Yu and ran to the backyard, there was actually a small workshop here, which had a full set of equipment for ironmaking and carpentry, stoves, hammers, chisels, carving knives, saws, planers...... It's really everything.

Huang Yueying quickly raised the fire, burned the molten iron, and then made a very thick iron nail and a nut-shaped iron block. Then she drew two parallel lines on the paper according to the method Sun Yu said. Sun Yu initially thought that Huang Yueying would encounter difficulties when drawing parallel lines, but he didn't expect Huang Yueying to take out a strange ruler, which was made of copper, but the strange shape, Sun Yu only used a glance to see that this was a vernier caliper...... It's a piece of cake to draw parallel lines.

I wipe, there were vernier calipers in the Three Kingdoms era? It's also too scientific! Sun Yu was shocked, after coming to this world, he often complained that the world was "too unscientific", but he didn't expect that there would be times when he complained about "too scientific".

As a result, nm01 replied seriously: "That thing is called 'Xinmang Copper Caliper', and it is treasured in the Yanjing National Museum, and it is a ...... invented by Wang Mang, the first strange reformer in Chinese history."

fainted to death, Wang Mang's buddies won't be traversers, right? Sun Yu Khan, hey, wait, buddy "invented" the screw in this era, if there is a time-traveler coming to this parallel time and space in a few hundred years, will he also make the same exclamation: "Sun Yu hundreds of years ago was too scientific, this guy won't be a time-traveler, right?" ”

Sun Yu was thinking nonsense on the side, and Huang Yueying on the other side was not idle, she wrapped the paper with the parallel lines drawn on the nails, and pasted them into the inner circle of the nut with the same winding method.

Then Huang Yueying's body was full of golden light, the word "Gongshen" leaped up, and the carving knife that was originally placed on the ground was surrounded by golden light, as if it was grabbed by an invisible big hand, and began to finely carve spiral patterns on the nails.

Sun Yu couldn't help but be slightly surprised, by the way, I always think about the problem from a scientific point of view, and I thought that it was impossible to achieve precision machining in this era of the Three Kingdoms, but ...... This world is not scientific at all, precision machining, such an impossible thing, handed over to the wonderful martial arts skills, is simply a piece of cake.

After a while, the screws and screw caps were carved, and Huang Yueying accepted the "God of Work", holding the screws and nuts in each hand, and twisted them together with some nervousness.

Soon, the screws and nuts were perfectly bonded and entangled.

"Wow! It's really good. Huang Yueying was overjoyed and said: "This thing is much more stable than nails, seek the truth, your invention is really amazing." As soon as she was happy, she even saved the word "gentleman" behind Mr. Xunzhen, and became called Xunzhen.

Sun Yu was not in the mood to worry about her, and said with a wry smile: "You don't plan to use it for all kinds of experiments again, do you?" ”

Huang Yueying laughed and said: "I was discovered by you again, I want to use it to fix all kinds of gear sets, hahaha, now I can make super large iron gear sets, durable ones." ”

Sun Yu shrugged his shoulders, he himself was engaged in scientific research, and he knew that Huang Yueying was about to start a crazy large-scale experiment, and at this time, scientists would be so stubborn that they couldn't care about anything, so he planned to go out.

"Seeking Truth...... You're really amazing. Huang Yueying suddenly blushed and looked at him and said, "The design of this screw and screw cap, as well as the idea of using two parallel lines to wrap a spiral pattern, have opened my eyes...... You're such a good man. ”

Cough! Sun Yu was about to say a polite word or two.

Huang Yueying's body suddenly leaned forward and kissed Sun Yu's face, and the gentle touch suddenly made Sun Yu's heart fly with a peach-colored fantasy.

Huang Yueying said faintly: "Do you really like ugly girls?" Don't lie to me! I know that your wives are all the best in the world, and you deliberately said this backword to squeeze my mother, right? ”

Sun Yu laughed for a while, and couldn't help but joke: "I'm used to eating delicacies from the mountains and seas, and occasionally I want to eat some coarse grains." ”

Huang Yueying: "......"

Poor Huang Yueying was spinning for a while, it turned out that I was coarse grain...... I'm crying!

(To be continued)