Yang Cong had a hasty meal with Wang Xuan and others at the Xuanhua Factory, and the holes of several musket parts were finally drilled, and the next step was the final step of grinding and assembly.

At this time, the hole drilled by the drilling machine is not very smooth, Yang Cong doesn't have to touch it, put it in a place with better light, and take a closer look, you can see that there are traces of the inner wall drilled out, such a rough inner wall, it is definitely impossible to stuff it tightly, it must be grinded.

The grinding of the inner wall is not as easy as the grinding of the outer wall, you must take a slightly smaller grinding rod and grind carefully and slowly, and the grinding craftsman must be particularly experienced, because once there is a little deviation, resulting in the inner circle is not round, then the workpiece is equal to waste.

Yang Cong anxiously waited for several skilled craftsmen to grind and assemble, while considering the problem of inner wall processing.

It is definitely not possible to grind slowly in this way, the efficiency is too low, and if you want to produce in large quantities, you must improve the efficiency.

So, how can you improve efficiency?

There are many reasons why the inner wall is not smooth, the structure of the drill bit is not good, the speed of the drill bit is too slow is another aspect, there is also the problem of drilling angle, the problem of clamp fastening, etc., it seems that if you want to drill out the inner wall is smooth, it is impossible to achieve it at this time, only after drilling.

What are the means of processing after drilling?

Grinding is definitely not good, even if it is in later generations, most of the grinding can only rely on manual work, and the efficiency is not very high, so it is not advisable at all.

At this time, Yang Cong thought of a simple thing, that is, a reamer.

The reamer doesn't seem to be very difficult to make, and grinding a very smooth round bar and then grinding a few sharp grooves to come out is basically the same.

Thinking of this, Yang Cong ordered someone to get charcoal and manuscript paper, drew a simple reamer shape, and explained it carefully to Wang Xuan.

At this time, Wang Xuan was shocked by Yang Cong's endless genius ideas, and if there was such a thing as an alien at this time, Wang Xuan would definitely think that Yang Cong was an alien.

The structure of the reamer is not very complicated, it is still the same problem, that is, it is more troublesome to process, Wang Xuan can only write it down first, and then order someone to do it when he is free.

After waiting for another hour or so, the grinding and assembly were finally completed, and a brand new arquebus appeared in front of everyone.

Yang Congdang brought everyone to the school and prepared for the test.

This test is actually very simple, directly recruit a musketeer from the Shenji Battalion, explain it to him a little, and then erect a large wooden plank two hundred steps away as a target.

As soon as the news of this new type of musket spread, not only the musketeers of the Shenji Battalion came, but even Tang Shunzhi, Zhao Shichun and other civilian officials and generals such as Zhu Xizhong, Qi Jingtong, and Tang Kekuan rushed over after hearing the news.

Yang Cong personally explained to the musketeers sent by the Shenji Battalion, and the musketeers quickly poured gunpowder into the bullet casing, and then took out a bullet and pressed it hard, and the ammunition was loaded.

Originally, after loading the ammunition, the opening had to be sealed with paper to prevent the gunpowder inside from being loose, but this is a test, and there is no need to march with bullets at all, so this step can be saved.

Immediately afterwards, the musketeers of the Shenji Battalion pressed the bullet into the bolt according to Yang Cong's guidance, pushed the bolt forward, and the loading of the ammunition was completed.

If you don't count the time to reload the ammunition in the front, the action in the back is completed almost instantaneously, and the reloading speed is so fast that almost everyone present is stunned.

In the expectant eyes of everyone, the soldiers of the Shenji Battalion roughly glanced at the position of the wooden plank in the distance, and then took out the fire fold without hesitation and lit the fuse.

There was a "pop" sound, and the bullet flew out in an instant, and soon, there was a faint muffled sound on the wooden board in front of it.

Yang Congdang led everyone to the front of the wooden plank, wanting to see how powerful the new musket was, but as a result, the bullet was found under the wooden plank, and there was a slight dent on the board!

This means that the power of the new arquebus is very poor, and the distance of two hundred paces is basically indestructive.

What's going on?

It stands to reason that as long as the amount of gunpowder is the same and the barrel length is the same, the lethality should be about the same.

After deliberating for a while, everyone came to a unanimous conclusion, and it was obvious that there must be a gap somewhere, a leak.

So, where exactly is the air leak?

Yang Cong decided to try another shot and take a closer look to see where the fireworks were coming from.

This time the musketeer didn't need him to teach, loading ammunition, the bullet was loaded in one go, very fast, when he lit the fuse, everyone stared at the back of the musket, trying to see where the fine fire smoke was spewed, as a result, with a "snap", the bullet did not fly out, but the connection between the front and rear barrels exploded!

It was "blown up"!

Seeing this, Yang Cong couldn't help but have black lines on his face.

At this time, the musket was easy to explode, he had heard of it, because the original barrel was rolled with a thin iron sheet, which was easily deformed after being heated, and the bullet and the barrel were almost tightly fitted, as long as the barrel was deformed, the bullet would be stuck in the barrel, and the power of gunpowder would explode in the barrel, and the barrel would explode, which was a common thing.

Unexpectedly, this new musket only fired two shots and exploded, which is also too wasteful, obviously, this kind of gun can not be brought to the battlefield, otherwise, all muskets will be scrapped after a few battles.

So, what to do, is it still the production of the original old-fashioned muskets.

This plan is also not advisable, the cavalry is better than mobility, no matter who it is, there is no guarantee that it will not be raided by cavalry in the field, not to mention that if you want to destroy or drive away the Tartar cavalry, you have to go to other people's territory, and it is impossible not to be raided.

Yang Cong couldn't help frowning again and pondering.

Now, he somewhat understands why the musket of the Ming Dynasty has been developed for nearly two hundred years and is still the same, because the development of the musket has encountered a bottleneck, and the existing technology of the Ming Dynasty can only make a one-piece musket, that is, the entire musket is a closed barrel at one end, once there is a connection part, there will be a disjointed explosion like just now.

In fact, it is very simple to solve this problem, that is, to put threads on the two barrels, and screw the front section of the barrel to the back section of the barrel, so that the two barrels cannot be disjointed and exploded.

However, in this case, the front section of the barrel had to be cast and drilled, since it was impossible to make threads on thin sheets.

There is another advantage of drilling holes in the front of the barrel, that is, it is not easy to deform, after all, the thickness of the pipe wall is at least about half a finger of the cast thing, and the deformation is impossible, and it is even more impossible to explode.

So, the question arises again, the back barrel is only as long as the bullet has to drill for an hour, and how long will the barrel in front of the more than one meter long take to drill, more than ten hours?

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