The traditional method of producing high-grade gun barrels is too cumbersome, and it is necessary to peel the hardwood into strips of uniform thickness, after several processes such as drying and oiling, the strips are made into round rods with high-grade glue paint glue, and then the outer layer is wrapped with hemp rope, smeared with raw lacquer, and then wrapped in arrowroot cloth, and then painted with raw lacquer on the arrowroot cloth, so that after several layers, the barrel of the gun is completed.

The barrel made in this way is good, but the cost is too high, the cycle is too long, and it often takes an adult time to see the finished product.

Although the gun barrel made by Chen Xian's method is not as strong and elastic as the traditional gun barrel, the cost performance is definitely far superior to the traditional gun barrel.

In addition to the spear and the boring palladium, Chen Xian even improved the wolf rod, he put a steel hoop with a hole seat on the barrel of the refined hard-pole gun, and then inserted thin hardwood branches into the hole seat on the side of the steel hoop, and the end of the branch was bent by fire roasting, so that all the branches were facing forward, and each branch was equipped with a small gun head, and a strip of cloth was tied to block the enemy's sight.

Such wolves are stronger and have a stronger ability to hold guns.

However, such an improvement did not satisfy Chen Xian, because he understood that the most important aspect of the combat effectiveness of a cold-weapon army depended on the armor.

An armour-piercing army and a non-armour-piercing army are two different concepts entirely.

An army is only qualified to be called elite soldiers if it wears armor.

The thirty-three young apprentices under Chen Xian are his team to survive in the troubled times in the future, and he must not tolerate easy losses.

Therefore, Chen Xian began to plan to equip these young apprentices with armor very early.

Plate armor is of course the best choice, but with Chen Xian's current technological means, the production of plate armor is too reluctant.

The production of plate armor completely by hand is too much work, and it is necessary to equip all the more than 30 students under him, and I don't know if it will have to wait until the Year of the Monkey.

The production of chain mail requires wire drawing equipment, and it is not too difficult to design a human wire drawing machine with Chen Xian's ability.

But the shortcomings of chain mail's lack of defense against piercing attacks are absolutely fatal in this era.

Whether it is the strong bow of the Mongolian iron cavalry, or the hard crossbow of the Southern Song Dynasty army, or the Jin army with both strong bows and hard crossbows, it is a nightmare for soldiers wearing chain mail.

The Mongol cavalry defeated the feudal knights of Europe, and many people thought that the Mongols were facing bulky plate knights.

But what is the real situation? At the time of the Mongol Crusade, full-body plate armor had not yet been invented in Europe, and at this time, the main equipment of European knights was precisely chain mail with insufficient defense against piercing attacks.

There is even an opinion that it was the Mongol cavalry that gave birth to the appearance of European plate armor.

This shows the weakness of the chain mail in the face of a strong bow and a hard crossbow.

In Chen Xian's planning, chain mail is always a type of auxiliary armor.

The craftsmanship of making plate armor is insufficient, and the defense of chain mail is insufficient, so piercing armor becomes the only option.

The traditional Chinese armor is not very technical, and it can be produced by a blacksmith.

However, the traditional process of producing armor is very inefficient, and although Chen Xian has a lot of subordinates, most of them have to invest in the production of katana, which is his source of income.

The few remaining apprentices produced the armor in the inefficient way of traditional craftsmanship, and even if he only had thirty-three apprentices, he didn't know how long it would take to equip the most basic armor.

Therefore, improving the production process of zha jia has become an inevitable choice.

The biggest bottleneck in the production process of the armor is in the production of the nail piece.

A piece of armor has thousands of armor pieces, and there are hundreds or thousands of less, if you rely on a craftsman to knock a hammer or a hammer, it makes people feel pain when you think about it.

But in this era, there is neither a punch, nor a shearing machine, nor a finished steel plate, in addition to relying on people to knock, what other way to produce nail pieces?

As an engineer, Chen Xian began to think about this problem in the light of his professional habits.

He listed the problems of nail production one by one.

First, how to efficiently obtain a uniform thickness of the plate?

Second, how to efficiently cut the plate to the right size?

Thirdly, how to efficiently weave holes for nail processing?

Fourth, how to speed up the efficiency of staffing?

It was the second and third issues that gave birth to tin shears and hand crank drills.

But the first question stumped Chen Xian.

He thought about it, and the only way to solve the problem of efficient production of uniform thickness and thickness of iron plate was the rolling mill, and he couldn't think of any other way.

The principle of the rolling mill is not complicated, and its basic principle is similar to that of the dough sheeter, which is to press and roll the material between the sticks through two opposing motions to obtain a product of ideal thickness. The difference between the two is only that the material of the rolling is different, and the pressure is different, of course, because the pressure on the rolling mill is much greater, the technical difficulty is naturally much higher

With the technological level of the Song Dynasty, it was naturally impossible to produce a rolling mill in the modern sense, but the primitive rolling mill was not impossible to make, after all, the most primitive binding machine was invented in the 16th century.

After some painful thinking (let a modern engineer think about how to design a machine under the current situation of the Song Dynasty, it is really a torture, and almost none of the process methods he is familiar with can not be used), Chen Xian drew a simple and primitive design of the rolling mill, the main components of the rolling mill, rollers, shaft seats, and frames, all of which are processed by casting (this may be the smallest technological means between this era and modern times), some small parts such as cushion blocks are forged, and the feeding platform is processed with wood.

But a new problem arises, how to combine these castings?

It's the Song Dynasty now, but there is no such thing as bolts and nuts.

The Internet writer's mobile phone, there is a lot of information, but there is no original processing method of screws, the reason is very simple, the background of the web novel he wrote is the end of the Ming Dynasty, at the end of the Ming Dynasty, the processing methods and equipment of screws have been transmitted from Europe to China, the production of arquebuses is inseparable from screws, and at the end of the Ming Dynasty, arquebuses have been introduced into China for nearly a hundred years, and China at that time has a mature Rose production process, so the Internet writer does not have to worry about screws at all.

But Chen Xian's current time is the Southern Song Dynasty in 1206, and even in Europe, screws in the modern sense have not yet been invented.

For that network writer, it was not a problem at all, but it became a big problem when it came to Chen Xian.

When Chen Xian began to think deeply about how to make screws, he found that this was a big project!

In modern times, there are many ways to process screws, the simplest of which is to use dies and taps to process bolts and nuts.

The problem with this method is where do the dies and taps come from......