Chapter 100 Equidistant Spiral

After saying that, Su You hummed the tune of "A Laugh in the Sea": "How dare you underestimate me for not using only the correct pronunciation?"

Shi Tong was dumbfounded: "What kind of music is this? Why does it keep repeating in waves?"

Su You laughed and said: "In "A Laugh in the Sea", the surging cross-strait tides are just recurring waves, right?"

Shi Tong said anxiously: "You must have the full word, right? Tell me quickly..."

Su You quit: "How dare you look down on Master, but I won't tell you! Let's go, Wei'er, and let's adjust the music box."

Shi Tong said: "Farewell, Master, change, let's change! You tell me all the music, and I will also tell you the music of these tubes."

Su You was very happy: "Apprentice, given your level, I will believe that you can compose music? Maybe it will become a song! Do I still need you to tell me when it becomes a song? Zizhan Ziyou, Sister-in-law Banniang, who is not

Expert? Can I trade with you? "

Shi Wei was as proud as a little rooster who won a fight: "Hmph! You deserve to speak ill of Brother Xiaoyou!"

Seeing the two children leaving, Shi Tong shouted: "Don't go, Master, put that music on the music box and repeat it in an uninterrupted cycle. It's better than anything else... Master, I was wrong, I was wrong, okay...

…”

When he got up the next day, Su You found a cylinder and a rope, and tied one end of the rope to the cylinder and the other end to the chalk.

Su You stood in front of the blackboard: "Today we will introduce a super-class content, a magical curve, an equidistant spiral."

"We assume that there is a point that expands to the straight line distance from the center at a uniform speed and at the same time changes its angle around the center of the circle at a uniform speed. What will the resulting trajectory look like?"

"To obtain such a trajectory, we can actually change the idea, that is, the two velocities at this point are constant, so their ratios are the same."

"Then can we do this? Now wrap the rope around the cylinder, and then fix the cylinder on the blackboard. Weier, come up and help me circle the circle with the chalk, and let the rope out. Pay attention to keeping the rope straight while drawing.

…”

"Everyone, please pay attention. Every time the chalk rotates once, is the distance between the chalk and the center of the circle exactly the length of the side of the cylinder? Is this the trajectory we want? Now look at it, what does this trajectory look like?"

"Like a snail! Like a dodder! Like a thermometer!"

Only Shi Wei dared to say: "Like clockwork!"

"Yes, it's like snails and dodder tips. What's the use of them?"

"In fact, it is very useful. If Uncle Shi and Grandpa Shi want to make a bead grinder, we can use this method to draw countless identical but non-overlapping curves starting from different bottom positions on the cylinder. Below

Who will try?"

The children stepped forward enthusiastically and soon got eight equidistant spirals.

The starting point is eight equal points on the cylinder. Sure enough, the spirals become denser and denser, but the distance between each spiral is completely equal and never overlaps.

Su You used a ruler and compass to make the center of the circle, and then drew two circles with the starting point and end point of the spiral as radii: "Look, if we cut these spirals into hemispherical grooves and put the iron balls in from the outside,

, put a lid on top and rotate it, what will happen?”

"By the way, the beads will roll toward the center along the spiral while rotating. If we remove the circle in the middle, will the beads fall in? So that each bead will go through exactly the same grinding stroke?"

Shi Fu finally understood, and his white beard flew wildly with excitement: "Wonderful! Wonderful! It's similar to the principle of a millstone, but the path the beads take is much longer than that of soy milk! It can also increase the yield rate!"

The pressed beads are actually basically the same size, but the degree of grinding is difficult to control. This method can solve this problem well. Finally, the diameters will be the same.

The ball grinding machines of later generations are actually based on this principle.

Su You took a piece of paper, used a small cylinder and pencil to draw an equidistant spiral, then cut along the line with scissors, and said with a smile: "Actually, there is a magical phenomenon."

After speaking, he pulled and turned the paper roll. The paper roll magically turned into a three-dimensional shape, and the entire outer contour turned out to be a cylinder!

Su You said: "You can also make such a device to dig holes in the soil, and the lower soil will be spirally sent out of the ground..."

"If we seal the cylinder with a sleeve and put it into the water for rotation, what will be brought up will not be soil, but..."

"Water! Water pump!" All the children started making a fuss.

Su You smiled and said: "Yes, in fact, machines that use mechanical energy or the gravity characteristics of objects to lift water from a low place to a high place are called water pumps. There is actually a physical problem of energy conversion..."

Several children raised their hands: "Kinetic energy is converted into potential energy..."

Su You laughed: "You guys from the infrastructure team...it's not impossible to start early, and it's necessary to preview, but it's not possible to be so far ahead unless you have a solid foundation." "Stay after class to do a set of test questions,

I'll take a look at your basic level, and if there's nothing wrong with it, you'll be responsible for tutoring your friends in physics from now on."

After the class, Shi Tong came over to say goodbye. He was going back to get micrometer parts.

But Shi Fu stayed, and his and Su You's mission was to produce qualified turning tools.

As the saying goes, "A fitter needs a file, a lathe needs a knife." The production of turning tools is also very particular.

According to different functions, turning tools are divided into five categories: outer circle, inner hole, thread, cutting, and forming.

Before the advent of precise distance gauges, angle gauges, vises, grinding wheels and belt sanders, talking about turning tool grinding was nonsense.

It is purely hand-grinded and must be extremely precise. Even if Shi Fu, a master who corresponds to later generations and is almost between the technician level and senior technician level, has to make turning tools without suitable tools, he will still be blind.

With the powders of various meshes obtained by the water flying method, the high temperature resistant adhesive water glass, various types of grinding wheel belts and copper-based steel-based sandblasting saw blades, manufacturing is possible.

With these, we come to the issue of lathe tool bits.

Shi Fuzhen was a treasure, and Su You was responsible for the drawings. He was responsible for forging the large size with a forging hammer, and then hand-made the cutter head blanks. Finally, he used a grinding wheel to rough grind and quench, and then used a sharpener to manually finely grind to the hundredth scale.

, he didn't dare to move anymore and waited for the arrival of Shi Tong's micrometer.

Su You had a lot of free time these days. In addition to attending classes and self-study, he also wrote to his sister-in-law and Er Su every week to ask questions and correct the children's homework.

In the remaining time, Shi Wei led Shi Wei to collect resources in the village and gradually worked out an idea for comprehensive agriculture in her mind.

The mountain pond has been renovated, the water power is twice that of before, the power is obviously "surging", and the weight of the forging hammer has been increased to two hundred kilograms.

The incubation room is the focus of Shi Wei's care. With Su You's love for her, how could he let his little daughter-in-law take care of chicken and duck eggs in a dark room? So we found some pieces of thin linen and we made transparent windows!

But don't think too much, just open two windows in the incubation room, brush a mixed solution of tung oil and rosin with tissue, and cover the indoor and outdoor sides of the windows.

It can transmit light and isolate air, which is good. As for glass, hahaha, I am too busy making lathe heads, so I really don’t have time!

However, Shi Wei was already very satisfied. She had to measure and adjust the temperature of the eggs and duck eggs every day, and she focused on being a mother.

Finally, that day, when Su You and Shi Fu were studying the carburizing box, Shi Wei hurriedly ran out: "Brother Xiaoyou, brother Xiaoyou, the eggs in the greenhouse are moving!"

All the children cheered, Su You also threw down the pencil ruler in his hand, and everyone ran towards the greenhouse in a swarm.

Shi Fu looked anxiously: "Hey! Is the carburizing box more important or a few broken eggs?!"

As a result, no one responded at all, and the venue was already empty.

Recommend a book "The Rebirth of the Financial Overlord", manipulating the stock market, making waves in the futures market, and wreaking havoc on the foreign exchange market. In the stock exchange, Zhao Jiangchuan looked at the crowded hall and couldn't help but sigh: So many fresh leeks... I
Chapter completed!