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Chen Gui started again: "I am stupid, I dare to ask Your Majesty, what is the appropriate number of riflings?"

Zhao Jidao: "There is no fixed standard for the number of riflings."

"Chen Aiqing can lead the craftsmen to try to make twenty-two lines from two rifling lines.

And test them separately to find out how many riflings this type of musket can perform best, and then it can be retained and promoted..."

"Wei Chen obeys the decree..."

At this moment, Chen Gui, the originator of the world's musket manufacturing (the first person to invent the bamboo musket), admired Zhao Guanjia's design ideas.

Previously, he developed a flintlock musket through the design drawings of Zhao Guan's family, which was hundreds of times more advanced than the bamboo musket he invented.

Now, the Zhao Guan family has designed an upgraded version of the flintlock musket. If it can be successfully developed, it will be many times more advanced than the muskets that have been developed so far!

However, Chen Gui still had some doubts in his mind. He asked bluntly:

"I am stupid and I still have something unclear. I would like to ask Your Majesty for advice."

Zhao Ji liked Chen Gui's tireless exploration spirit in firearms research very much, and said with a smile:

"Chen Aiqing, please speak."

Chen Gui asked: "When craftsmen make such a rifled barrel, how can they make it?"

Zhao Jidao: "In my dream, I received from the gods five methods of making rifle rifling.

I will tell you in detail,

One is, the scraper method..."

Chen Gui, a military technical expert who loves and is good at the invention and manufacturing of firearms, listened attentively to Zhao Guanjia's explanation...

However, even though Chen Gui is the first smart person in the world to invent the bamboo musket,

However, when he listened to Zhao Guanjia, who had some advanced scientific and technological knowledge in the 21st century, he also felt that he couldn't digest it for a while.

Chen Gui, who is forty-nine years old this year, with a solemn face and a great yearning for military science and technology knowledge, knelt down and asked:

"I am a humble minister. Can I please use a pen and paper to write down what the official said?"

Zhao Ji smiled slightly and said:

"Liang Daguan, gave Chen Aiqing pen, ink, paper, inkstone, desk and chair."

"Old slave, I obey." Liang Shicheng agreed.

He immediately led several young eunuchs around him, brought a table and placed it in front of Chen Gui. There were pens, inks, paper and inkstones on the table. Then, they brought a chair for Chen Gui.

Chen Gui was too late to sit down in front of Zhao Guan's house.

He stood in front of the table, holding a brush in his right hand, ready to listen to Zhao Guanjia's explanation and record it.

Chen Gui also had a high level of cultural knowledge. In his early years, he was a Jinshi of the Ming Dynasty in the Song Dynasty. He served successively as general officer, county magistrate, etc., and his shorthand ability was good.

After Zhao Ji saw that everything was ready for Chen Gui to make firearms, he continued:

"The number one method of making musket rifling is the 'scraper method'."

Chen Gui's pen quickly recorded Zhao Guanjia's words on the rice paper.

In order to facilitate the record keeping, Zhao Ji said slowly:

"The 'scraper method' is to use a steel rod slightly larger than the inner diameter of the musket to carve a groove on its front end and install a hard steel piece in the groove;

There are one or two protruding strips with a certain inclination angle on the steel sheet. The front end is sharpened and the height of the protrusion can be adjusted.

This device is called a 'scraper'.

Use a scraper to insert into the bore of a musket and pull it back and forth dozens of times to cut a chamber line, then adjust the position and cut another line.

Use this method to cut odd number of riflings, you can use a single scraper.

To cut even-numbered riflings, you can use a two-way scraper.

Of course, you can also install a single scraper, or double scrapers, and three sets of knives at opposite positions, which can cut two to six rifling lines at a time.

This is all my idea. Which method is better? Chen Aiqing can make the rifling process based on the actual laboratory and weed out the fittest."

Chen Gui quickly recorded the theoretical methods given by Zhao Guanjia.

At this time, Chen Gui was so shocked that he couldn't describe it. The 'scraper method' that Zhao Guanjia mentioned to create rifling made his eyes light up...

At this time, Chen Gui's expression was extremely shocked with a smile of admiration.

Zhao Ji added: "The first method of making musket rifling is the 'hook knife broaching method'."

Chen Gui changed to a second piece of rice paper and continued recording.

Zhao Ji said: "The hook broaching method is used to make the rifling, and the tool used is a simple manual wooden machine tool."

Chen Gui recorded this, with a puzzled expression on his face.

Zhao Ji knew that Chen Gui might not understand what the word 'machine tool' meant.

He then walked up to Chen Gui, took the brush from Chen Gui's hand, and drew a structural diagram of the machine tool on the blank space of the rice paper.

I saw that the front of the machine tool was a device that could hold the gun, and the back end was a wooden armrest with a steel tie rod that could be pushed and pulled...

When Chen Gui saw the diagram of the machine tool drawn by Zhao Guanjia for him, he immediately understood.

Zhao Ji returned the brush to Chen Gui and said:

"Chen Aiqing, this is the simple wooden machine tool diagram required for the 'hook knife broaching method'. Can you clarify the confusion after seeing this diagram?"

Chen Gui was ecstatic and kept nodding his head. Just when he was about to praise Zhao Guan's family, he was interrupted by Zhao Ji:

"Since Chen Aiqing has solved the problem, please record it quickly."

"The humble minister obeys the decree."

Zhao Ji said: "The hook knife broaching method is to place the hook-shaped cutter on a steel tie rod that is slightly thinner than the diameter of the gun bore. The height of the hook-shaped scraper blade can be adjusted by adjusting the screw on the layer of the tie rod.

Each time the wooden armrest is pulled, the hook knife on the steel lever in front of it can pass through the barrel once.

When the pull rod moves a little, the barrel can rotate at a constant speed, thereby broaching a bore line with a certain twist;

After reaching the predetermined width, change the position and pull the second rifling.

According to what I was told by the gods in my dream, using this method to draw a vaginal line only requires about twenty broaching times, and it can be completed!

If you use the same method to broach the grooves about a hundred times, the grooves formed will become thinner and more precise."

After Chen Gui finished recording, Zhao Ji said again:

"The third method of making musket rifling is the 'combined ring knife broaching method'.

The principle of this method is similar to the second method, ‘hook knife broaching method’, and can even use the same machine tool;

The only difference between this method and the 'hook knife broaching method' is that it does not use a hook knife, but uses a ring-shaped knife that is combined together.

Fix multiple hard steel rings on a tie rod, and the distance between each steel ring should be equal;

Then add equidistant scrapers with the same number as the bore lines on each steel ring. Each cutter can be connected to the cutter on the next ring according to its winding angle. From the beginning to the end, it can be regarded as a spiral.

shape line.

The protrusion of the blade on each ring is slightly larger than that of the previous ring, forming a series of cutters. The grooves opened have stable width, depth and spacing. This combination of ring broaches can be cut through the gun bore once.

All the cavities can shorten the construction period and improve production and quality."

After Zhao Ji slowly finished speaking this method, he saw that Chen Gui had also finished recording it. However, it was obvious that Chen Gui was still immersed in the unfathomable meaning and could not extricate himself.

Zhao Ji said: "I drew the design drawing of the 'combination ring knife broaching method' for Chen Aiqing."

Chen Gui immediately leaned forward, holding the brush in both hands, and handed it to Zhao Guan's house.

Zhao Ji took the pen and drew a schematic diagram of the 'combination ring knife broaching method' on the blank space of the rice paper written by Chen Gui.

After Chen Gui saw the picture, he suddenly realized that it was like opening the door to a new world...

Next, in order to make the firearms maker Chen Gui understand, Zhao Ji took a smooth wooden stick from the imperial guards.

Zhao Ji drew out his sword and made several sword marks lengthwise on the smooth wooden stick...

Everyone present could not understand why the Zhao Guan family did such an unusual thing.

Zhao Ji took the wooden root with several sword marks along the length, handed it to Chen Gui, and asked:

"Chen Aiqing, do you know why I am doing this?"

Chen Gui frowned, thought for a moment, and truthfully stated what he had guessed in his mind:

"Wei Chen dared to guess the holy will. Your Majesty's move should be to explain to Wei Chen the fourth method of making musket rifling.

However, I am so stupid that I can’t even guess what the purpose of this wooden stick with several sword marks is, even if I try my best.”

Zhao Ji smiled slightly and said, "Chen Aiqing, what if this wooden stick was replaced with a hard steel top cone?"

Chen Gui, the originator of musket manufacturing, suddenly realized:

"Could it be that the fourth method of making musket rifling is to use a hard steel top cone with grooves and raised vertical passages to force Yin and Yang rifling into the barrel?"
To be continued...