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A claw hammer was quickly brought in. If it wasn’t for the older worker around him, the worker with the claw hammer must be a flying hammer and smashed Master Craftsman from the stairs.

Smashing this Little Old Man is everyone’s thoughts including Li Huaxing.

Isn’t it the case that hits people?

In their eyes, perfect is not enough. There is nothing worthy of praise for baby products like child?

“You come down to me!” The already grumpy person began to growl angrily.

“Come down, we have a kind of open posture, it’s better than precision.”

It didn’t matter before, no expression could touch his expression, and disappeared from Master Craftsman’s face.

Replaced by the arrogance of to disdain as beneath contempt, in the eagle-like sharp eyes, the aloof and remote look down is revealed.

In response to the angry voice of the crowd, Master Craftsman spoke.

In a word, they instantly became the silence of being bombed.

“The two-side frame girder, I just glanced at it, and I knew that its straightness error exceeded 2 mm and 0.07 m.”

“12 meters long beam, what do you think the distortion is like?”

“The distortion has become a reptile, tell me, what is this qualified product?”

Everyone’s anger was blocked in the throat by Master Craftsman.

The straightness error of the beam…

The 12-meter long beam is a whole, and the larger the large-scale parts, the more difficult it is to process. Master Craftsman means that these 2 beams are crooked, no one meter is straight.

Master Craftsman is right. The beams milled by the large-scale milling machine itself have a certain precision error. When the crane is lifted to the frame for welding, the high-temperature thermal deformation caused by the welding makes the precision error of the beam larger.

The errors here can be measured by workers, but within a certain error range, workers feel that this will not affect the vehicle.

But how did this Little Old Man see it?

Chief Engineer Wang Caiqi couldn’t help but blush his old face. He knew that this error was one thing in his heart, and it was another thing to be pointed out by others instantly.

Although it feels no problem. But this error is indeed too large. Putting it on an ordinary car is definitely a substandard product.

They wanted to know, but unfortunately Master Craftsman did not give them a chance to ask questions.

“Look at your engine reducer housing again. Is that round? I draw a circle, which is higher than its precision.”

“It’s really ridiculous. Look at the distance between the screw holes of your reducer housing. The distance is so large. Is it saving money or time?” Master Craftsman brandished a claw hammer: “I dare to guarantee that the reducer housing will be used in one year. Lubrication begins.”

“This is rubbish, garbage designed without experience.”

The reducer shell is made of cast iron, and the size of the merely cast iron is really immense. And the reduction gear inside does not need to be in contact with the casing, so it is not so particular about precision…

As long as the precision of drilling at the position connected to the engine crankshaft is well controlled then it will be alright, anyway, the tolerance of the space left at the beginning of the design is large enough, and the extra power should leave room for the lubricating oil.

From the perspective of pursuing efficiency, there is nothing wrong with the design of Chief Engineer Wang Caiqi.

There are so many parts of a dump truck, in order to save time and cost, it can only be simplified as much as possible in unnecessary links, which is a common practice of many Heavy Industry companies.

but!

A word from Master Craftsman suddenly made Chief Engineer Wang Caiqi realize that he had made a big as the sky mistake, but also a classic dogma mistake.

He put the original 190-ton reducer on the 240-ton class, which is not at all wrong.

But he actually enlarged the design of 48 screw holes to make the shell seal, which was also enlarged to 240 tons without any increase.

The larger the size, the larger the spacing between the same number of screw holes.

As the spacing becomes larger, the fastening capacity will naturally decrease. For a long time, there must be violent wear between the gaskets, resulting in a problem often caused by domestic products-oil leakage.

Everyone was shocked by the cold sweat. Chief Engineer Cai Cai was pale, subconsciously touched the jacket pocket, took out the notebook he carried with him, and tremblingly recorded this big as the sky error.

Wait for him to write down this time with a quick recording method that only he can understand. Chief Engineer Wang Caiqi fiercely wiped off his cold sweat and let out a cool breath.

Then he turned around and found that all the workers around him actually took out their notebooks or cell phones, and he quickly recorded this fatal defect with fear.

It can be said that if Master Craftsman does not give them enlightenment today, they want to find this overlooked detail, only to wait until the product is delivered to the customer, and after a year or two of use, they are swarmed by the ensuing question Only when the phone bursts can we organize technical personnel to study it.

Unfortunately, at that time, their brand reputation will be affected, crowned with unreliable, oil leakage, design problems, and so on.

The more complex products, from design and finalization to true maturity and reliability, all need to go through a series of improvements, and have suffered numerous losses before they can be perfect.

Master Craftsman’s words directly let them step on a big hole.

“Look at your hydraulic lifting device again. The four main hydraulic lifts are so close together. Do you want to top the car?”

“Look at your turn again. I’ll trouble you to take a ruler to measure it and measure its spacing…”

“Look at your suspension design…”

Master Craftsman stood on the high operating platform, gushed, without any pause, any word he said, at this time in the ears of those below, has all become the best notes in the world.

Even those mantras that open your mouth and refuse to close your mouth become so sweet.

They became Wen Daoist at this time. The disdain in their hearts had been transformed into a strong admiration to the limit, and the worship of ten cows could not be moved.

Rustle ~

Here are a few technicians who use their pens and papers to quickly record sounds.

They were so obsessed with obsessed that they even recorded the words garbage and unqualified.

Li Huaxing’s performance at this time is really not strong enough. He has stood next to a technician, reviewing every word like a manuscript, ready to wait for the transcript to be completed, immediately take a copy and take it back to the office, studying behind closed doors.

“He… he’s not a guard, is he responsible for the janitor…” The bodyguard, who was stumbling in place like a stake, the brain has been down, and Bill Gates can’t solve the garbled characters.

“Look at the telex system you designed. I can only describe it with garbage. The gears of the DC motor are obviously…”

“Cough cough ~cough cough ~” Ye Qing heard Master Craftsman actually commented on the core technology of mining trucks, DC motor drive system, and immediately flicked his eyes with prompts.

Master Craftsman’s sudden silence made the following gang of technicians and workers who had already cleaned their ears ready to listen, immediately anxious.

“Master you continue to say.” The worker who wanted to smash him down with a hammer has now become a model of learning better than 3 good students. The cell phone directly opens the video function.

“Master, you continue to say, don’t stop at 10 million.” Chief Engineer Wang Caiqi is climbing the construction support at this time. He wants to get close to Master Craftsman and listen to the teaching at close range.

“Master you continue, our junk product has many technical defects, waiting for you to explain.”

“Yeah yeah.” The following technicians were nodded and threw their previous anger to the Country of Java.

What international joke, in front of him, this respectable old man is definitely a World Grade master. He may even have worked as a top grade technician at Caterpillar Company. His sentence is worth a decade of imagination.

“It’s all rubbish, and I can’t finish it at all.” Master Craftsman hēng hēng 2 walked along the road as spacious as the road to the rear axle where the immense DC motor was plugged.

A full-meter one meter thick, 8 meters long, shiny-white mirror-like drive shaft is exposed in Master Craftsman’s eyes.

Master Craftsman jumped flexibly onto the rear axle and tapped the immense power shaft with a claw hammer fiercely in his hand.

When 啷~

A clear and melodious sound of metal impact was transmitted to everyone’s ears.

No one dared to speak and even closed his breath temporarily.

Because Master Craftsman is closing his eyes and resting with his hands beside his ears.

When the melodious impact disappeared, Master Craftsman jumped to the other side and knocked the power shaft again.

“This can also be called a power shaft? There is even an internal injury in the middle, and the problem lies with it.”

Master Craftsman returned to the construction rack with a disgusted look, and said to the workers and technicians who stretched their necks and waited for the teaching: “Who is responsible for the production of such a garbage power shaft?”

Including Li Huaxing, everyone looked towards a technician wearing grey overalls.

They have unconditionally trusted the ability of Master Craftsman. With a claw hammer, they can distinguish the internal injury in the main shaft. What kind of magic is this?

“Boss…I…” the young technician blushed and said bluntly: “The precision of the power shaft is not…no problem, I dare to guarantee.”

“Every step of the workers is strictly in accordance with the production process, precision will not… there is a problem.”

“Master Qiao!” Chief Engineer Wang Caiqi kept scratching the silver-gray hair on his head at this time, which was also inexplicable: “If the precision of the spindle is not enough, it should be stuck directly, and it can’t move in one step, but it obviously runs. It’s been more than ten kilometers.”

“Your request for precision makes me feel despair low…” Master Craftsman shook his head.

“But the problem is not with precision, although precision only meets the minimum walking requirements.”

“The materials used are too rubbish, the processing technique is too rubbish, and the quenching is too rubbish.” Master Craftsman touched a power shaft: “The DC motor in the center of the power shaft gradually accumulates heat during operation, causing a slight thermal expansion of the power shaft. .”

“You certainly haven’t calculated the thermal expansion coefficient of the main shaft, and at the same time overestimated the quality of this DC motor.”

Heat…Coefficient of thermal expansion…

Chief Engineer Wang Caiqi as if was struck by lightning, his body trembled violently, and he was more excited than a morning of enlightenment.

A word to wake the dreamer!

No wonder everything was normal at startup, and it only ran for more than ten kilometers before it became stuck.

When they took the dump truck back to the workshop and unloaded 8 blocks of research, the temperature of the power shaft had already dropped, and naturally no precision error could be measured.

When the 190-ton dump truck was produced, it was a foreigner mature technology purchased directly. This problem has never occurred.

The self-developed 240-ton grade spindle material has also been used for 190-ton grade spindle materials, so the culprit is naturally a DC motor.

As long as you work hard on the heat dissipation problem of the DC motor, you can solve the stuck problem.

so that’s how it is, so that’s how it is.

Large-scale dump trucks are all engines, which drive the generator to work, and then generate immense electricity, which drives the DC motor on the rear axle.

The 190-ton dump truck DC motor and the 240-ton DC motor must be two designs.

Then only need to redesign the DC motor…

How to design…

Chief Engineer Wang Caiqi was just about to scratch his ear and scratch his cheek. When his hand touched his hair, he suddenly dropped down and slammed his thigh.

The Master of World Grade is right in front of me, I even want to display one’s slight skill before an expert to design the motor…

hā hā ~

Only their Board Chairman is bleeding this time!


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