"Young Master Su," craftsman Lu Ning walked over with the pattern, "This gun is determined to be three feet five inches long?" I'm going to get wrought iron and make it. ”

Su Chengyu hurriedly stopped him, "You don't have to make a new one, just use a ready-made bird pipe." ”

The flintlock pistol is an improved bolt from the arquebus, and the barrel of the two is identical. The processing of the barrel is the most time-consuming, and it can save a lot of time if you use the ready-made one directly.

Su Chengyu immediately went to Xu Tong to buy two gunsticks, and he owed ten taels more in the account.

These craftsmen thought that it was very unlikely that they could get wages, but Su Gongzi not only paid their wages in advance, but even paid the fine for damaging the roof of the shed.

They are all veterans of gun making, and privately casting firearms is their rice bowl, and their skills are much higher than those of the military craftsmen in the Ordnance Bureau who eat official rations.

Just after dinner, the gun bed was basically ready, and most of the simple parts on the gun machine were also made.

The most intricately shaped hammers and bolt bases can only be cast. Casting requires the production of clay molds, i.e. molds, which are extremely time-consuming.

At present, the mud fan has just been burned, and it has to wait for it to be poured out, and then it can be finished with a hammer, file, drill and other finishing.

Everyone was busy, Qiao Qian took the silver and returned to the Ordnance Bureau, and reported to Su Chengyu that someone had come to visit Shizi during the day.

Su Chengyu saw that it was getting late, so he asked a few craftsmen to rest, and he hurried back to the palace.

When he entered the palace, the ushers hurriedly reported to him that a general named Yu Xin had come in the afternoon.

Su Chengyu quickly found this person's information in his memory: Yu Xin, whose father had been Zhu Linmiao's father's bodyguard. Zhu Linmiao has known their father and son since childhood. Yu Xin, who was proficient in martial arts when he was a child, also helped him fight, and the two were punished by Zhu Yurui together.

It's just that Yu Xin joined the army two years ago, and due to the communication conditions of this era, he and Zhu Linmiao have not been in contact for a long time, and they are now officers.

Su Chengyu didn't know what was going on with this small office, but at least he could learn about the battle situation on the front line with him. He told the usher that if Yu Xin came again, he would go to the Ordnance Bureau to inform him.

Early the next morning, Su Chengyu asked Princess Chen for peace, and then turned back to the dormitory and asked Chanyi to find him in civilian clothes to change into, and then drove to the Ordnance Bureau.

The porter of the Ordnance Bureau was greeted by Xu Tong, and when he learned that it was "Su Gongzi", he let him in.

In the workshop, seven craftsmen have already gone to work, filing and polishing the freshly poured bolt parts.

Su Chengyu looked at their simple processing tools and shook his head in his heart, but he didn't have time to care about these things at the moment, and he had to improve them if he had the opportunity in the future.

After repeated processing and trial assembly, it was not until the afternoon that all the parts were ready.

Since it was the first trial production, the bolt was extremely sluggish after installation, and it was simply unusable.

The craftsmen got together to ponder, disassemble the bolt, grind the parts that felt inappropriate, file them one by one, install them and try again, if they didn't work, they would disassemble the parts and do it, and then install them......

Su Chengyu looked depressed next to him. In fact, you can't blame the craftsmen, there is no mature industrial drawing method in this era, and you can only draw a rough picture on the drawing, and many key parameters have to be estimated by the person who looks at the drawing.

For example, a section of arc, what arc length, tangent angle, outer distance, etc., are all absent, plus the drawing is a brush, the line ...... There is no way to talk about accuracy.

The craftsmen of the Ming Dynasty relied on experience to make utensils. A journeyman teaches his apprentice by word of mouth, and the apprentice then teaches the apprentice. Without a skilled worker to teach him by hand, he can only rely on repeated modifications and debugging like luck, and finally "try out" satisfactory objects and make himself a skilled worker.

Su Chengyu simply found a hard charcoal block from the hearth and sharpened it into charcoal. He took out the drawings of the self-made firebolts, compared them with the actual bolt parts, and drew the standard three views of all the parts with a pen and paper. During this time, he also had to ask the master carpenter to help make a pair of triangles and compasses.

Once the new drawings were ready, he speculated on the inventor's idea based on how the parts would behave with each other, mainly the hammer part, and then used the functions to calculate the appropriate parameters such as moments, angles, and radians.

Although it is only a very simple mechanical structure, it is still a bit challenging for Su Chengyu, a modern person who is used to using computers to calculate, but he has not returned all his college courses to the teacher. As an engineer who worked in the Vehicle Research Institute for three or four years, it took him an hour and a half to get these six or seven parts ready.

Based on his calculations, he instructed the craftsmen to re-polish and modify the bolt parts.

I was busy until it got dark, and the whole gun was finally able to run smoothly.

Su Chengyu personally loaded the polished flint pieces on the hammer, tightened the thread buckle, put down the fire sickle, pulled up the hammer hard, and pulled the trigger in the distance.

With a click, the hammer struck the flint on the fire sickle, and in the dim light, a few sparks could be faintly seen bursting out.

Several craftsmen saw the faint spark, their faces full of excitement and surprise.

A new gun that they had never touched before, from the pattern to the working ability, took less than two days! It's incredibly efficient, and they thought they would be able to do it in ten days.

All of this seems to have originated from Su Gongzi's pile of strange symbols like heavenly books, and somehow, after he finished drawing those "heavenly books", the specifications of all the parts were in his heart. The parts were reprocessed as he said, and the bolt was ready to use immediately.

Could it be that this Su Gongzi has learned the art of Qimen Dunjia? Several people couldn't help but admire Su Chengyu in their hearts.

Su Chengyu was the only one in the shed who shook his head slightly. The lid of the pot seemed to open a little late when firing, and he pulled the hammer and tried a few more times, and sure enough, most of the sparks were blocked by the lid of the pot, and it was difficult to fall into the pot.

Originally, there were fewer sparks, and it is certain that the shot rate of this gun will not be high now.

When he pointed the problem to the craftsmen, they looked at each other, after all, they were the first time they had come into contact with this thing.

Su Chengyu first asked the craftsmen to call it a day, and he removed the bolt from the gun bed and brought it back to the palace for study.

In the prince's bedroom, Chan Yi saw that the prince could see that he was holding those "iron lumps", so he hurriedly took a number of candlesticks and illuminated the room brightly.

After repeated observation and operation, and after comparing it with the flintlock pistol he had seen on the forum before, Su Chengyu finally discovered the problem.

In fact, the "high-tech" flintlock pistol of this era was not complicated in later generations, the hammer sandwiched the flint and hit the opposite fire sickle under the action of the spring, the fire sickle brought up the lid of the medicine pot, and the spark fell into the medicine pot to ignite the gunpowder.

The base of this self-generating fire gun is designed to be too small, resulting in a lack of angle between the hammer and the fire sickle when they collide, not only will it not hit too many sparks, but it will also cause the lid of the medicine pot to bounce too late.