Chapter 100: Equidistant Spiral

After that, Su You hummed the tune of "A Laugh in the Sea": "Dare to underestimate that I won't only use the correct tone?" ”

Shi Tong was stupid: "What kind of song is this?" How does it go back and forth? ”

Su You said with a smile: "A Laugh in the Sea", the surging tide on both sides of the strait, isn't it just a cycle of waves? ”

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

Su You quit: "Dare to look down on Master, I won't tell you!" Let's go, let's tune in the music box. ”

Shi Tong said: "Don't, Master, change, let's change!" You tell me all the tunes, and I tell you the tunes of these tubes. ”

Su You was happy: "Apprentice, at your level, I will believe that you can compose music?" Maybe it's a song! I still need you to tell me about the song? Zizhan Ziyou, Ba Niang's sister-in-law, who is not an expert? Can I trade with you? ”

Shi Wei was as proud as a little rooster who won a fight: "Hmph! Dare to say bad things about Brother Xiaoyou, you deserve it! ”

Looking at the backs of the two children leaving, Shi Tong shouted: "Don't go, Master, that song is on the music box, and the cycle is uninterrupted, it's better than anything else...... Master, I was wrong, I was wrong, I was wrong, I can't ......do it."

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 have a super-outline content, a kind of magical curve, an isometric spiral. ”

"Let's assume that there is a point that expands to the center at a constant velocity while changing the angle around the center of the circle at a uniform speed, and the trajectory obtained in this way will be like a miracle?"

"To get such a trajectory, we can actually think differently, that is, the two velocities of 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, Wei'er, you come up and help me circle with chalk, release the rope, pay attention to the rope kept straight when drawing......"

"Everyone, pay attention, every time the chalk rotates, is the distance between the chalk and the center of the circle exactly the length of the side of the cylinder? Is this getting the trajectory we want? Now you see, what does this trajectory look like? ”

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

Only Shi Wei still said: "Like clockwork!" ”

"Yes, it's like snails and silk shoots, what do we find it to be for?"

"Actually, it's very useful, if Uncle Shi and Grandpa Shi want to make a bead grinder, we can use this method to draw countless curves that are the same but not overlap from different bottom positions on the cylinder. Who's going to try it next? ”

The children jumped forward and soon got eight equidistant spirals.

The starting point is the eight equal points on the cylinder, and sure enough, the spirals are getting denser and denser, but the distances between each helix are exactly equal and never coincide.

Su You used a ruler to make the center of the circle, and then drew two circles with the starting and ending points of the spiral as the radius: "Look, what will happen if we cut these spirals out of hemispherical grooves, put iron balls in from the periphery, and put a lid on them to rotate?" ”

"By the way, the bead will roll along the spiral, rotating and going to the center, and we will remove the circle in the middle, will the bead fall in? So that each bead goes through exactly the same grinding stroke? ”

Shi Fu finally understood, and his white beard flew around with excitement: "Wonderful! Wonderful! It's similar to the principle of grinding discs, but the path taken by the beads is much longer than that of soy milk! It can also improve the yield of that - the yield! ”

In fact, the size of the beads pressed out is basically the same, but the degree of grinding is not easy to control, and this method can solve this problem well. Finally, the diameter is consistent.

The ball grinding machine of later generations is actually this principle.

Su You took a piece of paper, drew an equidistant spiral line with a small cylinder and pencil, and then cut it along the line with scissors, and said with a smile: "In fact, there is a magical phenomenon." ”

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

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

"If we close this cylinder in a sleeve and spin it in the water, it will not be dirt that will be brought up, but ......."

"Water! Pump! "The babies all made a fuss.

Su You said with a smile: "Yes, in fact, the machinery that uses mechanical energy or the gravitational characteristics of the object to lift water from a low place to a high place is called a pumping machine, and there is actually a physical problem of energy conversion in the middle......

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

Su You smiled: "A few of you from the infrastructure group...... It's not impossible to start early, and it's also okay to preview, but it's so much ahead unless you have a solid foundation. “

"Stay after class to do a set of test questions, I'll see your basic level, if there is nothing wrong, you will be responsible for tutoring your partners in physics in the future."

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

And Shi Fu stayed, and his task with Su You was to make qualified turning knives.

The so-called "fitter's file, lathe worker's knife", the production of turning knives is also very particular.

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

Before the precise distance gauge, angle gauge, vice, grinding wheel and belt grinding machine came out, it was nonsense to talk about turning tool grinding.

Pure hand-grinding, but also incomparably accurate, even if Shi Fu, who corresponds to later generations, is almost a master between the technician level and the senior technician level, if he does not have the right tools, he will have to cry blindly.

With the various mesh powders obtained by the water fly method, the adhesive water glass with high temperature resistance, various types of grinding wheel grinding belts and copper-based steel-based sandblasting saw blades, it is possible to manufacture.

With these, it can be said that the problem of the lathe cutter head comes up.

Shi Fu is really a treasure, Su You is responsible for drawing, he is responsible for forging a large scale with a forging hammer, and then manually making the blade head embryo, and finally using the grinding wheel to grind roughly, quenching, and then using the knife sharpener to manually grind to the level of a micrometer, he does not dare to move again, waiting for the arrival of the micrometer on Shi Tong's side.

Su You is idle these days, in addition to attending classes, self-study, and every week, he has to write letters to his sister-in-law and Ersu to ask questions and correct the homework of the children.

The rest of the time was to lead Shi Wei to collect the resources of the township, and gradually clear out a comprehensive agricultural idea in his mind.

The mountain pond has been renovated, the water power is twice as much as before, the power is obviously "surging", and the weight of the forging hammer has increased to 200 catties.

The hatchery room is the focus of Shi Wei's care, with Su You's love for her, how can she let her little daughter-in-law take care of chickens and duck eggs in the black room, so I found a few thin linen yarns, and we built transparent windows!

But don't think too much, just open two windows in the hatchery room, take a thin silk brush with a mixed solution of tung oil and rosin, and cover the windows on both indoor and outdoor sides.

It can transmit light and isolate air, which is good, as for glass, hehehe, I can't be busy making lathe cutter heads, I really don't have time!

However, Shi Wei is already very satisfied, and she has to measure the temperature of the eggs, ducks and eggs every day, adjust them, and be a mother with one mind.

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

All the babies cheered, Su You also threw the pencil ruler in his hand, and everyone rushed towards the greenhouse.

Shi Fu looked anxious: "Hey! Is it important to have a carburized tank or a few broken eggs?! ”

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