"Nephew Heng, this is the horse-drawn cart you want, what do you think, don't blame me if it falls apart soon, I am the hardest wood to use."

The uncle came to Yang Heng with a complaining face, looking like he had been ruined by Yang Heng, "And this matter of the blacksmith Lao Liu, who is also the best blacksmith in your family." ”

"Hello Xiaolangjun, I don't know what is on this car that can use the villain." Lao Liu was very good before he came to Yang Heng's house, but after coming to Yang Heng's house and seeing the heirloom used by Yang Heng, all the bull spirit was gone, you must know that Yang Heng used a double iron hammer, which was a hammer made of meteoric iron, and it was a pair of iron hammers made by Yang Hengzu with a lot of effort, and the weight of each hammer was more than 200 catties. Otherwise, Yang Heng's father would not be able to make such a good knife, but now this hammer is passed on to Yang Heng, not his father, you must know that this is the heirloom of Yang Heng's grandfather, and only the descendants who inherit the genealogy of their grandfather will pass it on.

"Come, Lao Liu, let me tell you the simplest thing first, but, uncle, there is still something for you here, that is, you have to replace the outer ring of this wheel with a two-inch thick wooden ring, and it should be moderately soft and hard, that is, not too hard and not too soft, that is to say, walking on some roads with stone blades, when you encounter a stone blade, there will be an indentation on this wheel, and after the past, the indentation will recover most of it, and Lao Liu, you need to create two thick iron sheets on both sides of this wheel. I want to use this iron sheet to clamp the whole wheel, but this outer ring should be left half an inch to an inch wide, so that this piece of wood is exposed and made into a wooden ring suitable for the outer ring to be easily replaced. "Naturally, Yang Heng wants to replace the rubber tires of later generations with this moderately soft and hard wood, Yang Heng can't make rubber now, not to mention that there are no rubber trees in this place, even if there is, it is not something that Yang Heng can do now, but Yang Heng can let people plant eucommia trees at this time, what leaves, bark are stored for future development and use, but at that time, these leaves and bark don't know if they can be used, but this eucommia also has a role, that is, medical treatment, Sun Simiao can be asked to study the medical value of Eucommia, but Sun Simiao should know the Tao of this matter, and Eucommia can be used in medicine, which is recorded in the Han Dynasty.

Now Yang Heng is a busy man, the training in the army, he has to ask from time to time, some inappropriate training methods have to be slowly improved, and some training methods that have not been involved have to continue to be added, the most important thing is to improve the three training outlines, with these three outlines, the soldiers' system, and obedience ability, will be greatly strengthened, no matter which famous general leads, will be very good to complete the synthesis of his battle formation.

Also, for the construction of the cement plant, Yang Heng should also pay attention to it from time to time, and also remind the workers who are developing it, as well as make reasonable improvements.

And the most important thing is the car in front of him, Yang Heng did not take the car back to the uncle, but stayed, with samples, he will always improve, now he is considering the axle system, ball bearings are not to think about it, but the sliding axle with bearing pads is Yang Heng has practiced on the waterwheel, which proves that this is a more suitable axle, and now it is used on the wheel, but the only thing to do now is to consider the dust-proof thing, Because this cart has been fighting with the soldiers in the north and south, there are all kinds of environments.

"Yes, this can be used as a dust-proof facility," Suddenly, Yang Heng remembered that in his previous life, some earlier machinery had really seen the kind of parts that used felt as oil seals, so another thing was solved.

Yang Heng waited for a long time, and the uncle appeared in front of Yang Heng with Lao Liu again, and then the car they brought, except for the wheel axle, was wrapped with a thick layer of iron sheet in other parts, Yang Heng was really a little crying and laughing.

"I said uncle, and Lao Liu, what are you doing here, when did I say that this car needs to be covered with iron sheets, doesn't this increase the burden on the horses, come, let me tell you, you see, in this place, this place, these mortise and tenon parts, you can add T-shaped iron, or horn-shaped iron, and the other parts, only those hard wood are enough to support the car, and these attached shelves, they do not bear the weight, naturally, these can be without iron sheets, Also, you bring this model back, this is the frame that supports the bow and crossbow, add it to this part, and this part, Lao Liu, this place needs an iron shaft, you can also build it, this does not need any steel, as long as it is iron, but it still has to be stricter, you go, according to what I said and then improve it back, next time I need to teach Lao Liu you to make load-bearing axles. Yang Heng once again drove Uncle Xiao and Lao Liu out of the city and asked them to continue to improve the car.

After a long time again, Uncle Xiao and Lao Liu appeared in front of Yang Heng again, and Yang Heng was not idle during this time, he was sorting out the standards for steel smelting, in recent years, Yang Heng found that some of the secret recipes for steel made from his ancestors were the best ones that were somewhat the same as the forty-five medium carbon steel in later generations.

Only No. 45 steel, not yet, naturally also need annealing and quenching procedures to make qualified axles, but also become, Yang Heng in his previous life with some stonemasons learned the ability to use water to simply quench, that is, to see the color of the steel just burned, and then after immersion in water, look at the color to quench the steel, this kind of soil Mr. method is not even worse than using a computer to measure the temperature and quench, this is also the result of Yang Heng's previous life idle and chatting with the old man, it is also useful in ancient times, but the most important thing is that his family has the formula of this steel.

This axle is the most important part of this car, other places need accessories, this part, Yang Heng does not want to prepare accessories, he needs to do it himself, in order to complete the manufacturing process of this axle.