Chapter 839

In the imperial study, the maid of honor shakes the fan and blows the cool wind to Xiao Ming and Lin Wentao.

Under Xiao Ming's explanation, the structure and image of one lathe after another appear in Lin Wentao's mind.

"The length measuring machine mentioned by the emperor, Qingzhou college, is already in the test, using the measurement unit set by the emperor. However, the most accurate length measuring machine that can be realized at present can only be one thousandth, and before manufacturing the length measuring machine, we must divide the millimeter level equally, so as to set the scale of one thousandth of the length measuring machine."

Lin Wentao's words made Xiao Ming nod, which was exactly what he wanted to say.

At present, the measurement accuracy of Dayu country basically stays at one percent, that is, millimeter level.

But if he wants to make locking structures and other more sophisticated machines, he has to increase the measurement accuracy to one thousandth, or even one thousandth in the future.

"You're right, but this bisection of millimeter can only be calibrated by hand. I'll provide you with a microscope. You try to divide millimeter equally." Xiao Ming said.

Lin Wentao nodded, accuracy has always been a headache for him.

In fact, in his opinion, whoever has mastered the industrial precision will master the mechanical manufacturing. After all, machine tools are also known as industrial machines in the books of Qingzhou University. As the name suggests, these machine tools are the mother of machines.

"Only in this way, we will inevitably have some errors in the scale." Lin Wentao has some regrets.

Xiao Ming frowned. In fact, the accuracy is only a relative problem, not an absolute one. Even the scales of rulers produced in the same batch at present will have errors.

Therefore, whether it is the accuracy of lathe accessories or the accuracy of manufactured parts, there are errors. In industry, it only needs to control the error in a range.

Because of this, Xiao Ming is not as confused as Lin Wentao.

This puzzle is how the scale came from at the beginning, such as meter, centimeter, millimeter, etc. in modern times, people may not think about the problem of ruler scale, because everything is ready-made.

But here, he has to explain that in fact, the most original scale is drawn by hand, just like he drew the weights and measures of the state of Dayu by himself, and spread it as a standard.

Then the craftsman makes use of this scale to make measurement units, and then makes the lathe produce parts with certain accuracy.

Because of this, in fact, the precision of spare parts manufactured in Dayu can only be polished by hand, and there is no other way. After all, in theory, only human hands can achieve infinite precision, and the evolution of lathe precision in history is like this.

In contemporary western countries, the standard of weights and measures has been formulated, and other countries can only imitate each other's units of size. In this way, it is difficult to achieve percent imitation, but only achieve similarity.

Now Xiao Ming and Lin Wentao are actually building the industrial precision of Dayu and the manufacturing tradition of Dayu. The essence of the manufacturing tradition lies in the preciseness of the craftsmen.

"Error is inevitable, there can be no absolute equidistance, we can only reduce the error to the minimum, once the accuracy standard of one thousandth is established, we can make one thousandth vernier caliper, and then we can make one ten thousandth length measuring machine." Xiao Ming said in a loud voice.

Mass production of breech gun parts is a node of industrial breakthrough in Dayu. Once this node is broken, Dayu will embark on the road of precision manufacturing.

In this process, he has to manufacture precision level, dial indicator, square, ruler, high-precision spindle mandrel and dial indicator rod, but before that, he has to have an original scale of one thousandth accuracy.

This is also one of his purposes for Lin Wentao to come here this time. He wants Lin Wentao to polish a vernier caliper with an accuracy of one thousandth by hand.

"Yes, Emperor." Lin Wentao nodded his head. He was under a lot of pressure.

After going back, he decided to start all the craftsmen to carve the vernier caliper with one thousandth of accuracy, and pick out a caliper from which the naked eye can't distinguish the error as the original caliper.

After mass production of vernier caliper manufacturing machinery, and then is the use of vernier caliper hand manufacturing other tools to ensure accuracy.

The teaching between them lasted until about 3 p.m. and Lin Wentao basically understood the problem of accuracy through the explanation.

After leaving the Imperial Palace, Lin Wentao went directly to Qingzhou University. Next, he will lead the students to establish the industrial precision standard of Dayu state, and formulate a set of part size specifications. However, first of all, he needs to make a 1 / 1000 precision original travel scale.

When Lin Wentao was busy, Xiao Ming was not idle. He summoned Li Chuyuan, the son of the king of Chu.

The sad Prince of Chu was thrown to Qingzhou because of the king's wild hope. After more than two years, his way back is still far away.

"Li Chuyuan, the son of Chu, visited the emperor."

In the imperial library, Li Chuyuan bowed 90 degrees and lowered his head deeply.

In the past two years, he has been living in Qingzhou, feeling increasingly prosperous and strong in Qingzhou. Especially after the defeat of Jinzhang khanate, he didn't sleep all night. In the middle of the night, he dreamed that he was thinking about a question, what will happen to the state of Chu when he confronts with Xiao Ming?At this time, Xiao Ming sat down on the chair in the imperial study and was drinking tea. He said to Qian Dafu, "give me a seat."

Qian Dafu answered and asked the eunuch to bring Li Chuyuan a chair. Li Chuyuan hesitated and sat on it.

They sat opposite each other, and Xiao Ming was not in a hurry to open his mouth. Instead, he handed the news of Cao Zhengyang's interrogation to Li Chuyuan and let him read it first.

Li Chuyuan was puzzled, but his face became more and more ugly.

"Wishful thinking, wishful thinking!" Li Chuyuan's hands trembled slightly in anger. "Where did the Cao family put their father? Where will I be? Emperor, the state of Chu is my vassal state. It can't fall into the hands of the gang of thieves in the Cao family. "

Xiao Ming is very satisfied with Li Chuyuan's reaction. As far as he knows, when the king of Chu sent Li Chuyuan to Qingzhou at the beginning, he was dissatisfied with him. Now, seeing that his feudalism is going to change, how can he not worry.

"I'm afraid you and the king of Chu have been kept in the dark by the Cao family. Since the Cao family wants to be in power, how can there be anything between your father and your son in the future?" Xiao Ming said.

Li Chuyuan nodded. He knew what was going on in the state of Chu, but he didn't expect that the Cao family would contain such evil intentions. They were waiting for them to grasp all the rights and kick them away.

"Emperor, my father is blinded by lard. Please allow me to write a letter to admonish him." Li Chuyuan said eagerly.

Xiao Ming narrowed his eyes. He believed that the king of Chu would not pay attention to Li Chuyuan's letter. After all, the king of Chu is crazy enough to lose his mind, and he does not want the king of Chu to step back from the precipice.

So he said, "your father won't listen to you now. I just ask you, do you want to be a lost dog, or do you want to be prosperous in the later half of your life?"

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