The t-4178a single-axis barrel drilling and boring machine is a special machine tool specializing in the processing of gun barrels. It mainly performs drilling and reaming of barrels. It is a high-precision machine tool. Lu Jiadong often came into contact with this machine tool when he was in an internship in a military factory, so he is very familiar with it.

Of course, Chen Ziyue and Chen Zihao didn't know about these things. They just watched Lu Jiadong walk straight to the edge of the machine tool, looked left and right, touched several parts with his hands, then put on the gloves on the operating table, picked up the wrench, and began to remove the spindle sleeve cover.

"Lu Jiadong, you'd better stop doing it. Something happened just now. I'm afraid..." Chen Ziyue didn't finish her words, but it could be seen from her eyes that she didn't believe that Lu Jiadong could repair it.

"Yes, just like my sister said, please come to repair it tomorrow!" Although Lu Jiadong said the model of the machine tool, it does not mean that it can be repaired, so when Chen Ziyue finished speaking, Chen Zihao also came up to persuade him.

Looking at the two of them with suspicious eyes, Lu Jiadong stopped what he was doing and smiled slightly: "Does this machine have a tightening phenomenon when the spindle sleeve moves vertically in a hot state?"

After hearing Lu Jiadong's words, Chen Zihao's eyes were wide open, his mouth was so open that he could stuff a fist into him, and he looked at Lu Jiadong incredibly.

Chen Ziyue looked at her brother's expression, then looked at Lu Jiadong with a calm smile, blinked her eyes and asked, "Brother, is he right?"

"Yes!" Chen Zihao came to his senses: "Yes, it's so right, how did you know?"

"It's actually very simple!" Lu Jiadong said with a smile on his face, and took off the spindle sleeve cover: "I saw just now that when you were operating the machine, the spindle sleeve made a clacking sound, indicating that this direction was not running smoothly."

Lu Jiadong said while using a wrench to twist the screw inside: "I came over and touched the spindle just now and found that the temperature was a bit high. Thinking about it, this should be the problem."

After Lu Jiadong finished speaking, Chen Zihao and others present were even more stunned. In their memory, only the old fitter in their factory, Master Liao, who judged the problem of the machine so quickly and accurately. There is a saying in the machining workshop that a good worker will be born in three months, and a good fitter will not be born in three years. It can be seen that it is difficult to master the fitter technology, but looking at Lu Jiadong who is only eighteen or nineteen years old, he is just an apprentice, how can he have such good technology?

Seeing his brother's expression, Chen Ziyue knew that Lu Jiadong was right again. Seeing him skillfully dismantling the machinery and quickly and accurately judging the cause of the failure, Chen Ziyue became confident in Lu Jiadong, so she asked:

"Lu Jiadong, are you really good at repairing machines?"

"I understand a little, I understand a little!" Lu Jiadong responded modestly, took off his two parts, then took off his gloves, touched the gears of the spindle with his hands twice, and the grease was stuck all over his hands. Seeing this, Lu Jiadong couldn't help but frowned, then put the grease on his nose and smelled it, then turned his head and asked Chen Zihao:

"Has this machine been maintained a few days ago?"

"yes!"

"What kind of grease are you using?" Lu Jiadong continued to ask.

"Two 5, what's wrong?"

"No wonder!" Lu Jiadong said as he wiped the oil stains on his hands with a rag: "You are using grease improperly, and when you are maintaining, you add too much grease, which causes the temperature to rise too high when the spindle is running at high speed, causing the phenomenon of clamping!"

"How is it possible? The spindle sleeve is tightened, because there is little grease. If the grease is not added, how can the parts be run?" Chen Zihao frowned and raised his own question.

Lu Jiadong looked at Chen Zihao and showed a calm smile on his face: "The usual thinking is that lubricating oil or grease is required to tighten the parts. However, in some machines, the grease cannot be placed too much, especially for such high-speed moving parts. There is a lot of heat when running at high speed, and the heat dissipation of grease is very bad. If added too much, the temperature of the machine parts will be too high."

Chen Zihao lowered his head and pondered: "Well, yes, the master said this before. Since that's the case, what should I do?" Chen Zihao lowered his head,

"It's easy!" Lu Jiadong replied confidently and crisply: "Do you have special 7 grease here?"

"have!"

"Then take it over, remove the moving parts, remove the previous grease, and apply it again with Special 7, but remember to apply only a thin layer."

"Is this OK?" Chen Zihao asked.

"Don't worry!" Lu Jiadong replied confidently. After hearing Lu Jiadong's words, Chen Zihao did not let go of his doubts. Although the first time he saw Lu Jiadong, the 18-year-old boy had already given him too many surprises, from flying to saving his sister to accurately naming the machine tool model, from quickly and accurately judging machine tool failures to how to use lubricating grease.

But this does not mean that such a complex extra bed can be repaired. However, he heard what Lu Jiadong said, and it was okay to ask Lu Jiadong to try it when he had no good method, so he handed the wrench to Lu Jiadong.

Lu Jiadong took the wrench and started to disassemble the machine tool. Chen Ziyue couldn't help but feel a little worried because of the previous incident, so she asked her brother in a low voice:

"Brother, do you think Lu Jiadong can do it?"

"This... I don't know much!" After hearing Chen Zihao's words, Chen Ziyue's worries were even better. She knew very well that her brother was known for his research and technology in the entire factory. Even the masters in the factory sometimes could not compare to him. Now he can't repair the machine. Is this new Lu Jiadong really OK?

Lu Jiadong didn't know what the Chen brothers and sisters thought. At this time, he was concentrating on dismantling the machine. Looking at the gears and connecting rods coated with a thick layer of grease, Lu Jiadong knew that his judgment was correct, so he picked up the cloth to clean the special 5 grease on these moving parts, applied a thin layer of special 7 grease, and then reinstalled the machine.

Then he took the previous flying steel pipe, put it in the slot of the operating table, and locked it with a fixed button. At this time, he turned to Chen Zihao and said:

"Your fixing button was not locked just now, and then the rotor of the operating table was twisted by you accidentally, causing the drill bit to be in line with the blank, causing the danger to occur!"

"Haha, I was a little anxious at that time!" Chen Zihao scratched his head and explained awkwardly.

Lu Jiadong did not continue to talk about it. After all, the lesson Chen Zihao had learned in this dangerous situation. If he was held accountable for this unreasonable situation, it might have a reverse effect. So Lu Jiadong turned around and operated the machine tool seriously. His operation method was no different from Chen Zihao before, except that he held the rotary handle of the left and right test operating table very firmly.

"You guys get out of here!"

"Lu Jiadong, be careful!" Chen Zihao instructed, then pulled Chen Ziyue to the side.

Lu Jiadong did not answer, but straightened the drill bit with a calm smile, and then operated the spindle sleeve with his right hand and slowly fell vertically. During this period, it was running smoothly and an uninteresting clamping phenomenon occurred. As the props touched the blank, a turbid cutting fluid mixed with metal crushing and gushed out. As the spindle slowly fell, the drilling hole of a barrel was completed.

The Chen brothers and sisters standing next to them did not expect Lu Jiadong to repair the machine so easily. In their impression, only Master Liao, a gold medal fitter in the factory, had such skills, but Master Li was almost 60 years old, and Lu Jiadong in front of him was not even twenty years old!

Because Lu Jiadong was paying attention to the machine tool, he did not see the surprised expression of the Chen brothers and sisters. He just felt that the two had not reacted for a long time, so he asked, "The machine tool has been repaired, don't you try it?"

"So quickly!" After hearing Lu Jiadong's question, the two of them woke up, so the two brothers and sisters walked to the machine tool, started the machine tool, and successfully processed a blank according to Lu Jiadong's previous operation steps.

"You really repaired the machine tool, Lu Jiadong, you are so awesome!" Chen Ziyue turned off the machine tool switch and praised excitedly.

Chen Zihao, who was standing beside him, also nodded: "The gold medal master in our factory is just like this!"

"It's just a problem of grease, nothing is amazing!" Lu Jiadong waved his hand indifferently: "You may be just a moment of impatient, or you are confused by the authorities, it's only a matter of time before you fix it!"

Lu Jiadong really felt that this was not a problem. After all, when he was intern in the military factory in the later generations, he had been exposed to the use of grease and the maintenance of getting up. Such a small technical problem was not a problem for him, but it was not a problem in his eyes. However, it was indeed a profound technical problem in the eyes of the Chen brothers and sisters. Moreover, what Lu Jiadong said made the brother and sister think that this was Lu Jiadong's modest expression, and therefore his favorability for him became a little more.

"Jiadong, you don't have to be humble. What I, Chen Zihao, admire most is the skilled person. Besides, you saved my sister today and didn't say anything. Go to my house tonight and I'll treat you to dinner!"

"this......"

"What? Is it inconvenient?" Chen Ziyue saw that Lu Jiadong was a little embarrassed, so she stepped forward and asked.

"No!" Lu Jiadong replied with a smile: "But my friend who came with me probably has prepared the meal. If he doesn't want to go..."

"So that's the case. Well, tomorrow is Sunday. I'll ask Xiaoyue to find you. Then you come to my house with your friends!" Chen Zihao didn't force anyone to do anything: "By the way, you live in the staff dormitory, are you?"

"Yes, live in the second floor, Room 206!"

"Okay, that's it!"
Chapter completed!