In the imperial study, the palace maid shook the fan in her hand, blowing a cool breeze on Xiao Ming and Lin Wentao. Pen, fun, and www.biquge.info

Under Xiao Ming's explanation, the structure and images of lathes one after another appeared in Lin Wentao's mind.

"The emperor said that the length measuring machine Qingzhou College has been tested, using the measurement unit formulated by the emperor, but the most accurate length measuring machine that can be achieved at present can only be one thousandth, and before manufacturing the length measuring machine, we must divide the millimeter into equal parts, so as to set the scale of one thousandth of the length measuring machine."

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

At present, the measurement accuracy of Dayu is basically stuck at one percent, that is, millimeters.

But in order to make latching structures and other more sophisticated machinery, he had to measure to 1 thousandth of a thousandth, and then even 10,000th.

"You're right, but you can only scale the millimeters by hand, and I'll provide you with a microscope, and you can try to divide the millimeters at equal distances." Xiao Ming said.

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

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

"It's just that in this way, we will inevitably have some errors in the scale." Lin Wentao had some regrets.

Xiao Ming frowned, in fact, accuracy is only a relative problem, not an absolute problem, even the ruler scale produced in the same batch will have errors.

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

It was precisely because of this understanding that Xiao Ming was not as confused as Lin Wentao.

This puzzle is how the scales came about in the beginning, such as meters, centimeters, millimeters, etc., and in modern times people may not think about the problem of ruler scales, because everything is ready-made.

But at this point, he must explain that in fact, the most primitive scales are drawn by hand, just like he personally drew the weights and measures of the Great Chongqing Kingdom, and used this as a standard to generalize.

The craftsman then uses this scale to create a unit of measurement, which in turn allows the lathe to produce a certain precision of the part.

Because of this, in fact, the accuracy of the spare parts made in Dayu can only rely on manual grinding, there is no other way, after all, theoretically, only human hands can achieve infinite precision, and the evolution of lathe accuracy in history has come through this.

In the contemporary West, the standard of weights and measures has been established, and other countries can only imitate each other's units of size, so it is difficult to imitate the hundredth, and can only achieve approximation.

Now Xiao Ming and Lin Wentao are actually doing this in fact, they are also establishing the industrial precision of the Great Chongqing Country and creating the manufacturing tradition of the Great Chongqing Kingdom, and the foundation of the manufacturing tradition lies in the rigor of the craftsmen.

"Errors are inevitable, there can be no absolute equidistancy, we can only reduce the error to a minimum, once the accuracy standard of one thousandth is established, we will be able to make one thousandth of a vernier caliper, and then we will be able to make a one-thousandth of a length measuring machine." Xiao Ming said loudly.

The mass production of breech gun spare parts is a node of industrial breakthrough in Dayu, once this node is broken, Dayuguo has embarked on the road of precision manufacturing.

In the process, he also had to make precision levels, dial indicators, rectangular meters, flat rulers, high-precision spindle mandrels, and dial indicator rods, but before that, he had to have a primitive scale with a thousandth accuracy.

This is also one of the purposes for him to let Lin Wentao come here this time, he wants Lin Wentao to hand-polish a vernier caliper with an accuracy of one thousandth.

"Yes, Your Majesty." Lin Wentao nodded emphatically, he was under a lot of pressure.

When he returned, he decided to mobilize all the craftsmen to engrave this vernier caliper with a thousandth of an accuracy and pick out a caliper from which the naked eye could not distinguish the error as the original caliper.

After that, the machinery for making vernier calipers is mass-produced, and then the vernier caliper hand is used to make other tools that guarantee accuracy.

The teaching between the two lasted until about three o'clock in the afternoon, and Lin Wentao basically understood the problem of accuracy through the explanation.

Leaving the palace, Wen Tao went directly to Qingzhou University, and then he wanted to lead the students to establish the industrial precision standards of the Great Chongqing Kingdom and formulate a set of parts size specifications, but first he needed to manufacture a thousandth of the accuracy of the original vernier caliper.

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

This sad prince of Chu was thrown to Qingzhou because of the ambition of the king of Chu, and it has been more than two years, and the way back is still far away.

"Li Chuyuan, the prince of Chu, see the emperor."

In the imperial study, Li Chuyuan bowed ninety degrees and bowed his head deeply.

In the past two years, he has been living in Qingzhou, feeling the growing wealth and strength of Qingzhou, he is becoming more and more uneasy, especially after the defeat of the Golden Horde, he has never slept all night, and he is thinking about a question in his midnight dream, what will happen to the Chu State against Xiao Ming?

At this time, Xiao Ming sat down on a chair in the imperial study and was drinking tea, and he said to Qian Dafu: "Give me a seat." ”

Qian Dafu responded and asked the eunuch to bring a chair to Li Chuyuan, Li Chuyuan hesitated, but still sat down.

The two sat opposite each other, and Xiao Ming was not in a hurry to speak, but handed over the news of the interrogation of Cao Zhengyang to Li Chuyuan and asked him to read it first.

Li Chuyuan was originally a little inexplicable, but after reading it, his face became more and more ugly.

"Wishful thinking, wishful thinking!" Li Chuyuan's angry hands trembled slightly, "Where did the Cao family put their father?" Where do you put me? Your Majesty, the State of Chu is my feudal country, and it cannot fall into the hands of a gang of thieves of the Cao family. ”

Li Chuyuan's reaction made Xiao Ming very satisfied, as far as he knew, he was a little dissatisfied when the King of Chu sent Li Chuyuan to Qingzhou, and now he saw that his feudal country was about to change, how could he not worry.

"I'm afraid that you and the King of Chu are both kept in the dark by the Cao family, since the Cao family wants to take power, how can there be a matter of your father and son in the future?" Xiao Ming said.

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

"Your Majesty, my father has been blinded by lard, please allow me to write a letter to advise my father." Li Chuyuan said eagerly.

Xiao Ming narrowed his eyes, he believed that the King of Chu would not ignore Li Chuyuan's letter, after all, the current King of Chu was a little crazy to the point of losing his mind, and he did not want the King of Chu to rein in the precipice.

So he said; "Your father won't listen to you now, I only ask you, do you want to be a lost dog, or do you want the glory and wealth of the rest of your life!"