One day in the spring of 1973, before the desserts of the power supply bureau to repair the power supply equipment in the workshop, this unforgettable opening of the furnace finally ended smoothly with a narrow escape. Everyone couldn't help but sigh. I bought two steamed buns in the canteen and ate them while walking back to the model room to work. Humming a cheerful tune, I gently opened my workbench and took out a few commonly used tools. I was prepared to first sharpen the tools that needed to be sharpened and repair them. Then, he would look for the team leader to accept the mission.
At this moment, technician Liu from the workshop came to my workbench. She was holding a broken arc-shaped cast iron part in her hand. He asked me tentatively,"Can you recreate a model of this incomplete circular cast iron object that is roughly the same as this object?" I turned around and glanced at the cast iron block. Before I could answer, she had something else to do. She conveniently placed the incomplete cast iron piece on my work table and turned around to do her other things.
At that time, I was blaming this technician Liu in my heart. I haven't even agreed to it, but you put this piece of cast iron on my workbench. What's going on? Even if it's a production task given to me by the workshop. You're a technician, so you can't directly send the task order under my name. At least you have to go through the section chief, Master Yang. You're already doing this, and you're throwing it at me so directly. What should I say? Master Yang would definitely have an opinion. I think it's better to be safe.
So I took this piece of iron to Master Yang. I didn't expect the section chief, Master Yang, to laugh before I could ask."You don't have to say anything. I know everything. Technologist Liu told me that I asked her to put this cast iron fragment on your workbench. Just make a model for him. Remember this. It was cast iron. You have to calculate the radius of those arcs first. Don't be in a hurry to cook. Before you make the model, let me know about it. Let me see."
Oh my god, this piece of iron really fell on my head. It seems that I can't get rid of it. Since he couldn't reject it, he would start doing it. I asked Master Yang,"There's no data on this object. How can I do it?" Master Yang said,"Take it and move it slowly on the sample. Try it first." He picked up another call and turned to leave.
I sat in front of the workbench, holding this incomplete piece of work flat in my hand and placing it on a drawing board. I moved it along the arc direction bit by bit. At the same time, I used half a carpenter's pencil to follow the outer arc of the incomplete iron piece. Slowly, a smooth arc appeared on the drawing board. It could be seen that the length of this arc segment was more than half of the length of the part. Then, I used a steel ruler to pass through its approximate center. He roughly measured the diameter of this incomplete piece of work. He roughly calculated its radius. Of course, in the end, I was able to draw out the entire shape of the metal fragment.
By slowly moving it, he could try to get a radius or diameter. I don't know if the data is correct. He did not have any confidence at all. At this moment, my fellow disciples all looked at me with strange gazes and came over from all directions. They felt that I was very strange. From afar, I looked like I was setting out. But there was no blueprint for the layout. All I could see was a black, rusty piece of cast iron, and I was making some random gestures on the drawing board. Those few senior and junior brothers were laughing at me, and I couldn't help but laugh. While chatting and laughing, I assigned the work section chief, Master Yang, to me. I told everyone about the whole thing, and the six or seven people scrambled to draw on my drawing board. After a long while, six or seven arcs appeared on the board. The data obtained had their own merits. In comparison, everyone's measurement accuracy was different. It could only be said that it was generally inclined to a certain value. Which one was the standard? I don't know. He did not dare to say which data was correct. He still couldn't determine which arc to use as the diameter benchmark.
The radius calculated by measuring and calculating with a ruler could only be a rough base. Due to the lack of theoretical proof, everyone's vision was different and their senses were different. The visual data could not be completely consistent, but it could be generally inclined to a rough range. Although I can roughly get some basic data, I don't know if the result meets the original design requirements of this artifact. Therefore, he did not dare to rashly start making models.
That afternoon, the workshop sent me to the city to do some work. After I finished my work, I saw that I still had some free time, so I went to my alma mater. Chengdu City 32 Middle School. I want to consult my geometry teacher. But I was told that the geometry teacher had taken his students to the factory to learn how to work.
I had no choice but to walk out of the school gate with disappointment. I had no choice but to turn to the library near the People's Park in Chengdu City. However, most of the books in the library were not lent out, especially the textbooks on science and technology. At that time, they were sealed and could not be lent out at all.
So I went to the Xinhua Bookstore on South People's Road. It was better than the library. There were middle school algebra books for sale. There were still no geometry textbooks. There were also some books on mechanical drawings. I flipped through it and found that the book only talked about how to draw. How to do it in the front view, top view, and left view. Draw the artifact. However, it did not mention the specific data source and theoretical calculation method.
When I got home at night, I took out all the math textbooks that my eldest brother used in high school from under the bed and patted the dust off the books. I couldn't wait to open up the books on analytical geometry and plane geometry. I copied the diagrams from the books, used the basic laws of analytical geometry and the basic drawing methods of plane geometry, and after repeated examples and verification, I finally confirmed the basic idea of making the model of the cast iron fragment the next day.
The next morning, as soon as I entered the model room, I sat in front of the workbench and began to think about the model structure and size of this incomplete cast iron piece. First, I placed this incomplete cast iron piece on the drawing board with my left hand. Along the outer arc of the incomplete cast iron piece, I randomly drew two arcs of the outer circle. On each arc, I randomly drew a straight line segment of the lower chord. Then, I used the compass drawing method to find the upper and lower center points of these two long straight line segments. Then, I connected these two groups of upper and lower center points respectively. Two sets of vertical bisected lines were obtained. These two sets of vertical bisected lines must intersect here. There must be an intersection point, and they could only intersect at one focal point. From this focal point to any point on the outer arc, their distance was the same. The distance between the lines was exactly the same. Then this intersection point must be the center point of the circle. According to the laws of analytical geometry and the basic principles of plane geometry, the distance from the center point to the outer edge of the circle in any direction was equal. Theoretically speaking, the resulting figure must be a circle.
After repeated theoretical verification and actual measurement verification. The result of the theoretical verification calculation was compared with the drawing method of moving along the circular arc bit by bit. The difference between the two methods was about 3 centimeters.
According to the theoretical verification and the actual measurements over the past two days. After repeatedly comparing the two plans, I got the outermost radius of the cast iron fragment. Using this as a reasoning technique, he took out a drawing board and actually set out the size of this cast iron piece. After the sample was released, I asked the section chief, Master Yang, to come over and review my calculation results. After Master Yang carefully calculated repeatedly. In the end, they agreed to my proposal.
Since Master Yang has already agreed to my calculations, I'm afraid that I'll have to do something about it. With my confidence and courage, I let go of my hands and feet and began to operate normally. After that, the process of making models would become a cliché. As for the subsequent cutting, planking, and marking. Cutting wood. He screwed the wooden screws and installed the wooden model. I won't go into detail.
According to the material of the work piece and the requirements of the process flow, I quickly completed the model. After the inspection, the section chief, Master Yang, went to the workshop office. The technician in the workshop, Liu, passed the inspection. Based on the model that I created, I will use the data to deduce and redraw the blueprint. Then, he moved on to the next production process.
In order to summarize my experience, I compared the radius of the circular arc that I pieced together with the real object with the radius of the circular arc that I obtained using the theoretical calculation method. The difference between the two circular arcs was nearly 12 millimeters.
That afternoon, the workshop's labor and personnel manager told us,""Your apprentice allowance has been adjusted to 22.50 yuan per month.”
From this matter, I feel that the most profound experience is: Model workers indeed needed to master more scientific and cultural knowledge. More importantly, they needed to integrate theory with practice. As a model worker, not only did one have to be able to understand blueprints, but more importantly, one had to master various cultural knowledge and understand many professional skills other than blueprints. Turn them into an organic data system and apply them to specific production practices to better complete our production tasks.
With the little cultural foundation I learned in the classroom when I was in junior high school, it's impossible for me to be a good wood model worker. As the saying goes,"Work till you are old, learn till you are old."”No one dared to say that his skills had reached the peak and he could stop learning.”In my practice as a wood model worker, I deeply felt that I was seriously lacking in all aspects, especially mathematics and geometry. At that time, if I hadn't flipped through my brother's mathematics textbook, I definitely wouldn't have dared to determine the outer arc diameter of this incomplete artifact.
When I was in junior high school, I had a strong interest in geometry class. Mathematics class was the foundation of geometry class. He had the common sense of mathematics and geometry classes in junior high school. In addition, he had taken a few days of drawing lessons at the construction site. My ability to read mechanical maps is faster than other apprentices. The same blueprint. Everyone received the blueprints together. When others were looking at the blueprints, I was already setting up the layout. When others began to stock up, I was already cutting the materials. While the others were cutting the materials, I had already started to make the model. In addition, I often make some auxiliary tools myself. He had improved his skill level and sped up the progress of model making.
Time passed too quickly. In the blink of an eye, it was the winter of 1973. In the workshop, during a normal re-election of the Youth League branch, a fierce debate was triggered at the expansion meeting of the Youth League branch around the confirmation of the list of candidates for the new Youth League branch with the theme of democratic centralism.
Please look at the next section,"A fierce debate at an expanded meeting of the Youth League Branch."
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