They tried various methods, and the first few spiral groove rollers were made with problems, and the spiral groove was always not standard enough, and the winding degree was either not enough, or the error was too large.

Later, Zhang Blacksmith came up with a way to solve this problem, using a few threads to wrap in one direction on the wooden roller, and finally marked these lines on the wooden roller, and then began to cut grooves, and finally made a qualified wooden roller with spiral grooves.

Blacksmith Zhang is an anxious person, don't say anything if you don't do it, once you start tossing something, you have to get it out as soon as possible.

And now, having handed over the responsibility of managing the gun, he had freed up the time, so he simply threw himself into the matter, and took a few of his blacksmiths, and a few apprentices, plus carpenters, all of whom took their bedding and lived in a gun workshop.

Every day, under the leadership of Blacksmith Zhang, these people keep knocking and beating to make various parts for this rifling machine, but the manual production error is large, and they have no standard design drawings, so they can only grope to do it, and the parts are always not qualified, so they can only do it again.

It took about ten days, and this rifled machine tool was in the hands of Zhang Blacksmith and others, and it began to take shape and had certain conditions for testing.

So Blacksmith Zhang invited Yu Xiaotian to the gun to watch the rifling machine they made.

As soon as Yu Xiaotian entered the testing and processing plant as a blacksmith, he saw this horizontal rifling machine, so he immediately rushed over excitedly and began to watch carefully.

There was basically no difference in shape between this rifling machine and the primitive rifling machine tool he had seen in pictures and videos in his memory, so he began to carefully observe the structure of this simple machine, and tried to operate it himself, when pulling the wooden roller with a spiral groove, the spiral groove on the wooden stick slowly rotated in the card groove, pulling a long iron rod.

The front end of the iron rod is a broache with an exquisite structure, the broache can be disassembled, and can be stuck in the chamber with a spacer, so that it will not be offset when the knife is moved, this aspect is not designed by him, all of them are the methods that Zhang blacksmith and others came up with, and the specific broach used by Western gunsmiths in history is the same as the same, he is not sure.

The broach snaps into the iron and is pulled as the wooden roller rotates, allowing it to be fed into the chamber until it is pulled out of the other end of the chamber.

In this way, it was basically no different from the kind of machine he knew of that simple rifling, and the next thing he could do was to test it to see if this machine could pull out a usable rifled barrel for them.

So Yu Xiaotian immediately ordered Blacksmith Zhang to take a few finished smoothbore barrels that had been made and drilled, and began to test them in the workshop.

The smoothbore barrel is stuck on the clamp of the machine tool, and after correction, it is stuck to the clamp with a wedge and is completely secured.

Blacksmith Zhang began to operate this rifling machine nervously, first inserted the iron rod that fixed the broach into the chamber from the front of the barrel, until the head of the kara knife was exposed from the back, and then the blacksmith Zhang took a broache they tried to make, fixed the broach on the base of the long rod with a spacer, and gently fed it into the chamber until the broach was stuck in the muzzle, and then began to work at the other end.

He fixed the other end of the long rod to the wooden roller engraved with a spiral groove, clamped the long rod with a pin to make it immobile, checked it back and forth several times, and after calibrating it, it was considered ready.

Yu Xiaotian did not do it himself, but carefully watched their operation on the side, judging from the order of their operation, the steps of the Western craftsmen on the video he remembered were basically the same, until Zhang Blacksmith After they completed all the preparations, they looked at the machine tool nervously, and Yu Xiaotian nodded and said: "Let's start!" See if this guy works! Don't be afraid of failure, if you fail, just continue to modify, now it seems that there is basically no problem, it should be possible! ”

Blacksmith Zhang quickly nodded in agreement, drove the others away, walked to the end of the machine tool himself, and grabbed the handle of the wooden roller.

As the blacksmith began to pull the handle hard, the wooden stick with the spiral groove began to rotate slowly in the card slot and was pulled to the other end of the machine, and also drove the long rod with the broach to slowly enter the chamber.

There was a slightly harsh sound of metal grinding inside the chamber of the gun, which could be heard as the edge of a hard broach eating into the inner wall of the relatively soft wrought iron barrel.

The wooden roller was slowly rotated and pulled out by the blacksmith, and the long rod also drove the knife, rotating while feeding the knife in the chamber.

This process is actually not long, but in the feeling of everyone, time seems to have frozen, until the knife was pulled out of the other end of the chamber by Blacksmith Zhang, and Yu Xiaotian realized that this first rifling should have been created by him.

So the blacksmith Zhang took off the long rod, and immediately someone took a piece of white paper and brought it to the other end of the chamber, Yu Xiaotian couldn't wait to get to the end of the chamber, closed one eye and began to look through the muzzle and look inside the chamber.

Because there was a blank piece of paper at the other end, he could clearly see the inside of the chamber.

In the inner chamber of the barrel, which was originally polished, smooth and round, a clear rotating spiral groove appeared at this time, forming a regular Yin engraved line, Yu Xiaotian almost jumped up happily on the spot, and laughed with his big white teeth: "Ha Luha!" It's done! This first rifling is carved out! Ha Lu Ha ......"

The whole shed was filled with Yu Xiaotian's wild laughter, and he was almost so happy at this time that he couldn't wait to hug Zhang Blacksmith and kiss him hard, so shocked that everyone hurriedly took two steps back, worried that Yu Xiaotian would lose his mind and go crazy, which would be troublesome.

Fortunately, Xiaotian's nerves are still big enough, and he can still bear this kind of happy event, and he didn't lose his heart on the spot, and after laughing wildly for a while, he began to look for problems.

"This rifling is very even, there should be no problem! It's just a little shallow! You need to pull it a few times to pull this inscribed line a little deeper! ”

Blacksmith Zhang also came over to carefully observe the chamber from the muzzle of the gun, at this time he was also very excited and happy, this line looks very simple, but it condenses his more than ten days and nights of hard work, and he didn't expect that such a simple way actually solved such a big problem, relying on this wooden roller with a spiral groove, it can actually carve such a uniform rifling in the small chamber, he really can't figure out how Yu Xiaotian figured out this method.

So he straightened up and said to Xiaotian: "The big boss, the little ones are really convinced of you!" You can actually think of such a way, if we want to think of it, give the little ones a few more years, I'm afraid we can't think of such a way! ”

At this time, these craftsmen and apprentices who participated in the trial production of rifling machines also came over to watch the rifling in the chamber of the gun, and they were all excited and amazed at the same time.

Yu Xiaotian was a little proud, but immediately realized that this thing was not invented by him, and he was just copying the techniques of his predecessors in history, but he immediately thought that the person who invented this kind of engraved rifle has not yet been born, since he got this thing, even if it is plagiarism, it can only be counted on his head, so Zhengse said: "There is nothing difficult in the world, I am afraid of people with hearts!" As long as you put your mind to it, you can actually come up with a lot of good solutions! The key is to think more and ponder more! ”

Blacksmith Zhang nodded yes again and again, and then said to the craftsmen and apprentices around him: "Have you guys heard the words of the big boss?" You have to work harder, don't just think about eating and sleeping all day long, look at the big boss, in your busy schedule, you still have to think about so many things, you have to learn a little bit in the future, use more snacks......"

These apprentice craftsmen hurriedly said yes, now in their eyes, Yu Xiaotian is simply a god, with them to make guns, and cast cannons, to create a sharp killing weapon, but also to make a lot of convenient tools and machines, and also came up with the current production method, it can be said that it has created a miracle, this kind of thing for them to do, they don't dare to think about it, but under the guidance of Xiaotian, one by one, they have done it.

Therefore, these people can be said to admire Xiaotian for their five-body throwing, and they are willing to do whatever they want, just thinking that they can follow Yu Xiaotian to learn a scale and a half claw, which is enough for them to eat for a lifetime.

Next, Zhang blacksmith adjusted the thickness of the gasket of the broach, pulled the handle again, and pulled the broach back and forth several times, after observing, the inscribed line of the rifling has become relatively deep, and Yu Xiaotian was satisfied.

Blacksmith Zhang made persistent efforts, adjusted the head of the knife, and began to pull the remaining rifling, tossing back and forth for a long time, and the barrel was completely rifled by him.

Yu Xiaotian lay in front of the muzzle, looking at the rifling in the chamber, he only felt that this was the most beautiful thing in the world, and he couldn't wait to sleep with this barrel in his arms, his saliva almost flowed all over the ground, and he was a little excited and dancing.

But he finally controlled his emotions, although the rifled barrel has been made, but there are still some problems with this machine, the base of the cutter head is a little not easy to use, it is very troublesome to adjust, and the quality of the cutter head does not seem to be very good, so I pulled a barrel, and the cutting edge of the knife is already a little not too sharp, and it still needs to be polished before it can continue to be used.

In addition, there are some small problems with this machine, so I won't say it again and again, and Blacksmith Zhang has also found these problems, noted them down one by one, and decided to continue to modify them until these small problems are completely solved.

But anyway, they got the first rifled barrel out, and then they waited for the test.