After much trial and error, they finally installed the "dynamic balancing device" on the old C620 lathe. Tightening the last screw, Liu Li straightened up and wiped the sweat from her brow. The onlookers were still there, and Master Zhao was still standing a short distance away with his arms crossed, his eyes still filled with suspicion, but now with a more scrutinizing "let's see what you can pull off."
"Try turning it on," Liu Li said to Xiao Wang, the young worker operating the machine.
Xiao Wang glanced nervously at Master Zhao before reaching out to switch the power on. The bed started spinning with a rumble, but the sound seemed... not much different?
Master Zhao curled his lip, the meaning of which was clear: See, all that work for nothing?
Liu Li ignored them, took out the vibration measuring instrument she had brought, and carefully measured several key positions on the main shaft, while Xiao Zhao quickly recorded the data beside her. After the measurement was completed, she asked Xiao Wang to process a stepped shaft that had previously had a high scrap rate.
The cutting tool contacts the workpiece, and the cutting sound rings out. Liu Li stares intently at the screen of the measuring instrument. Zhou Wei's optimized fuzzy control algorithm begins to work quietly inside the device, driving the mass block to perform micron-level compensation based on the real-time detected vibrations.
A few minutes later, the part was finished. Xiao Wang took off the workpiece and, as usual, picked up the calipers to measure it—usually at this time, the dimensions would be out of tolerance.
"Don't rush," Liu Li stopped him and used the measuring instrument to check the spindle vibration again. "Look, the vibration amplitude is much smaller than before."
On the measuring instrument screen, the value representing the vibration amplitude had indeed decreased. Only then did Liu Li allow Xiao Wang to measure the workpiece dimensions.
The calipers were tightened, and the reading came out... The critical dimension was right in the middle of the tolerance range! Absolutely perfect!
Xiao Wang seemed incredulous, measuring it twice more, a look of surprise on his face: "It...it passed? So easy?"
Master Zhao couldn't help but come over, take the calipers and measure it himself. Looking at the precise reading, he remained silent for a long time.
"Master Zhao, please listen to the sound again," Liu Li reminded him.
Master Zhao listened carefully. Indeed, the annoying, subtle buzzing noise from before had almost disappeared, and the machine tool's operation sounded much smoother and more solid.
Liu Li handed the vibration data record book, which showed before and after the modification, to Master Zhao. It clearly showed that the spindle vibration amplitude had decreased by more than 70%. She then took out the previous processing records for this workpiece, which showed a scrap rate of nearly 30%.
“With less vibration, the machine tool is more stable, which naturally improves machining accuracy and reduces scrap.” Liu Li’s tone was calm, yet carried an undeniable authority. “Master Zhao, you’re an expert. These data and these results can’t be faked, can they?”
Looking at the solid data in the notebook, and then at the precisely machined part in his hand, Master Zhao's stubbornness and doubt gradually crumbled. He was silent for a moment, then handed the notebook back to Liu Li and muttered, "This thing... there's something to it."
He didn't say anything more and walked away with his hands behind his back. But in the following days, observant people noticed that Master Zhao would occasionally stroll over to the C620 machine, listen to the sounds, observe the workers operating it, and even once, he took the initiative to ask Xiao Wang, "That metal box, is it alright if there are any more problems?"
The effect of the "prototype machine" was like a stone thrown into calm water, beginning to ripple throughout Workshop 2 and even the entire factory area. The initial skepticism and doubt gradually subsided in the face of irrefutable data and facts. More and more people became curious, started discussing it, and began actively inquiring about what this "iron box" actually was and whether they could install one in their own beds.
Liu Li knew that the "model" she had carefully established was beginning to truly take effect. The next step was to let this spark ignite a prairie fire.
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