Daile looked at Jiayi's operation and couldn't help but admire, she was not blind, it was obvious that he didn't know why he was distracted at the beginning, and he scribbled randomly. Now he has changed it into a strange car.

It's supposed to be a car, with wheels, Dale thought.

"What are you??" Although she guessed, Dale couldn't help but ask.

"Clever!" Looking at the drawings he had drawn, Jia Yi couldn't help but feel proud, this painting was the one he felt most satisfied with.

Dale asked, "Then how do you get this car? Won't it fall? Do you use horse-pulling?"

After Jiayi gave an affirmative answer, she was even more puzzled, because she really couldn't understand how to use this car.

"I call it a two-wheeled human-powered self-driving vehicle, or bicycle for short. When I make it, you'll know what to do with it. "Jiayi pretended to be profound, but of course there was no physical object, so I couldn't specify it.

The picture came out, and Kaichi was suddenly full of motivation and couldn't wait to get the car made.

In Jiayi's impression, the bicycle is still very simple, just two wheels and a chain, which does not seem difficult. If you can't build a bicycle, can't you even build a bicycle?

In his last life, when he first graduated, he shared a house with his classmates, and his classmates bought a second-hand mountain bike, and then bought all the parts online and replaced the parts of the whole car.

It's all! including frames, wheels, and so on.

In fact, it is equivalent to reassembling a mountain bike.

So in Kaichi's impression, it is not difficult to make an ordinary bicycle.

He didn't just roll up his sleeves recklessly, first of all, he started drawing. It's not the renderings that Dale sees, but the design of the whole thing, even though he's never drawn it.

But there is a saying, have you never eaten pork and never seen a pig run - although in the previous life, many people have only eaten pork and never seen a pig run. He has also seen a lot of design drawings, according to the cat and the tiger, it would be good to have a similar appearance, anyway, it is all for himself.

In the process of designing the drawings, he also made models out of wood, the kind of equal scale, because the drawings are always not intuitive, the specific size is always not good, how big the wheels should be, how to design the forks, where the stool is, where the foot pedal is easier to use, etc.

He designed it for 10 days with just a drawing, because he had to make a wooden model to try it out for himself, and at the same time he had to pull Flower to try it out, because he was still young, and if he used himself as a model, the design would be a children's car.

But after the drawings were designed, a wooden model car also came out, but the wheels, bearings and everything were wooden, and there were no chains, and the pedal was still an ornament.

Looking at this strange-shaped car, Flower was full of doubts: "Jiayi, this car can't stand steadily, how to use it?"

Jia Yi stepped forward, adjusted the stool to the lowest, then straddled the car, landed on the ground with both feet, and then climbed on the ground with his feet, and the car began to run forward. When he first started learning to ride, he enjoyed riding like this, without worrying about falling.

Flower looked at Jiayi's "cart" galloping, and became interested, and hurriedly stepped forward: "Jiayi, let me play, I have made an experiment for you for so long, let me play." ”

Jia Yi was not interested after playing for a while, after all, it was just a model, and the axles were not polished and smooth, and it was actually quite difficult to "ride". He got out of the car and gave it to Flor.

"Jiayi, what are these two pedals doing here, it feels like it's in the way, and it's useless!" After "riding" two laps of the car, Flower couldn't help but give his opinion.

Jia Yi didn't even reply: "Because it's not done yet, this is just a model, used to determine the size." ”

"Oh, okay, give me one when you're done, and I have a lot of credit for it. The rise of Flor's play, said.

After designing the drawings, it was rare that it had just begun, because Kaichi suddenly thought that he didn't know what to do with tires, and there was no rubber. The steel ring should be very shocking, and it won't be broken. Although this is quite troublesome, Jia Yi can't think of a good solution for a while, so he can only do other parts first, and the tires will be solved last.

If it really can't be solved, it's a big deal to ask the teacher to use magic to refine some elastic materials, or engrave an anti-gravity magic circle, and just make a flying bicycle.

Kaichi first made the frame out of steel, and in order to make it strong, he made a triangular frame directly, but in order to make it easier for him to ride, he moved the right side of the crossbar down to form an inverted figure 4. After the frame is made, it is the front and rear forks, which are all large parts, and it is not difficult to make, and Jia made them all in half a day.

He is now very proficient in using the magic furnace, especially since his tentacles have been calcined so hard that he can embroider flowers from molten iron or glass in the furnace.

Once these are done, the first challenge comes out – the chain.

In fact, the production of the chain is not particularly difficult, but there is a point, annoying! Each section of the chain must be made separately, and then connected together, and to ensure that the size of each section of the chain is exactly the same, so that it can completely coincide with the gear, otherwise, the two sides can not be combined, it will be wasted.

There are no industrial assembly lines here, there are no lathes or anything, all of them need to be refined little by little by themselves in a magic furnace. Originally, Jia Yi wanted to make a hydraulic forging press, but unfortunately the flow of the stream in the valley was too small to drive the hydraulic forging press at all.

After refining four or five chains, Jiayi no longer wanted to do this kind of repetitive work, but fortunately, there was still Flower.

He used to make a special car for Flower, plus the paper made him the second author, fooled him into coming over to help make the chain, and then Dale knew about it and took the initiative to participate.

After two days, the chain was ready.

Mainly to ensure the accuracy of the chain, the finished chain of each section must be compared in detail to ensure that each section is exactly the same.

But the chain is only the easiest of these difficulties, at least if you are willing to spend time, this is not a difficulty.

Next, we encountered difficulties in making the bearings.

In order to ensure that the ride is labor-saving and the steering is easy, he is ready to make ball bearings. However, how to ensure that each ball is the same size, and to ensure that the shape of the ball must be perfectly round, these are very troublesome and not easy to solve.

Finally, each of the steel balls made has to be ground manually by themselves, grinding them until the shape is consistent, and the surface is recognizable, and the friction coefficient is the smallest when it is installed in the bearing as a support.

In this way, sometimes after several days have passed, after the bearings are made, they are installed on the gears and hubs, and then the foot pedals and wheels can be installed.

But the wheels are not in a hurry, because they have not been done yet, and rubber has not thought of an alternative method.

In fact, if the road can be better, there is nothing without rubber tires, but the town is still too small, it does not take half an hour to walk from beginning to end, and not all places are easy to walk. Without rubber tires, it is destined to be a big toy.

I thought I'd ride home with a bicycle.