The "Technical Promotion and Training Manual," still smelling of fresh ink, had barely been bound when the project team's first "Online Dynamic Balancing Technology" training course commenced. Over twenty trainees from seven or eight different affiliated units gathered, including veteran technicians with gray hair and sharp eyes, and young technicians fresh out of school, brimming with a thirst for knowledge. Liu Li, as the main person in charge of this technology and the main author of the manual, was chosen to give the first lecture.
Standing behind the podium, looking at the curious, scrutinizing, and expectant gazes below, Liu Li felt her palms sweating and her heart beating faster than usual. This was even more nerve-wracking than when facing complex blueprints and difficult technical problems. She took a deep breath and opened the manual she had helped write, which she could almost recite from memory.
"Good morning, teachers and colleagues. My name is Liu Li. Today, I will introduce the 'online dynamic balancing device' that our group has developed..." Her opening remarks were a bit dry, and her voice was slightly tense.
Following the outline of the manual, she began by discussing the dangers of high-speed spindle vibration and the limitations of traditional methods. At first, she seemed a bit awkward reading from the handout, but as she talked about how they were initially driven to desperation by the vibration problem and how they had a sudden inspiration during the debate, her speech gradually quickened and her eyes lit up.
"...At the time, we thought, do we really have to make it perfectly balanced in a static state? Can we make it spin and then 'secretly' make up for it?" She used a vivid analogy, and someone in the audience chuckled knowingly, which lightened the atmosphere.
When talking about making sensors, she didn't directly present the circuit diagram. Instead, she picked up a pre-wound coil and a simple probe holder: "We mechanical engineers sometimes have to use some 'makeshift methods.' If we can't buy the right ones, we'll just wind them ourselves! The key is to understand why it can 'sense' vibrations..." She explained the principle of inductance change in the simplest language, using diagrams from the manual. Several veteran technicians in the audience nodded frequently as they listened.
When it came to the fuzzy control section, she completely abandoned the lecture notes and started drawing diagrams directly on the whiteboard: "Think of it this way, like an experienced mechanic adjusting a machine. He doesn't rely on complex calculations, just on 'feel.' If the vibration is too strong, he tightens it a little; if it's too weak, he loosens it. Our device learns from that 'feel'..." As she spoke, she used simple arrows and words to describe the logic of the rule base, avoiding complex mathematical formulas as much as possible. Zhou Wei sat below, listening to her explain his complex algorithms in such a simple way, his face showing a mixture of surprise and admiration.
The afternoon session featured practical demonstrations. At the lab's test bench, Liu Li, Zhou Wei, and Sun Mei worked together, guiding the trainees step-by-step through the process. From winding, installing, and debugging the sensors, to setting the control box parameters, and finally, conducting integrated testing.
"Mr. Liu, how do you control the tension when winding this coil? It always seems inconsistent." A young technician asked.
"Look, your wrist needs to be steady and your force needs to be even," Liu Li picked up the enameled wire and demonstrated personally. "Like this, one loop close to the next, just feel the resistance evenly. Practice a few more times and you'll get the feel for it."
"Mr. Zhou, do we need to readjust these control parameters for different devices?" An experienced technician was more concerned about applicability.
"The principle is universal, but the specific parameters need to be fine-tuned according to the characteristics of the equipment," Zhou Wei patiently explained. "The manual includes guidelines for parameter adjustment and reference ranges for common equipment types."
"Mr. Sun, if this signal waveform has these glitches, what's usually the problem?" someone asked, pointing to the oscilloscope.
“It’s most likely a poor grounding or power interference,” Sun Mei immediately pointed out several possible causes and troubleshooting steps. “You can check here first, and here too…”
The trainees' questions were varied, some even quite tricky. Liu Li and her two colleagues moved among them, answering every question and sharing their knowledge generously, drawing on the manual's content and their own practical experience. Seeing the trainees' initial confusion turn into the delighted expressions of surprise when they saw the vibration curve successfully suppressed after personally debugging the equipment, Liu Li's initial tension and anxiety were gradually replaced by an unprecedented sense of accomplishment and satisfaction.
After the first day of classes ended, the students crowded around to ask questions, reluctant to leave. Looking at their enthusiastic discussions and the knowing looks on their faces, Liu Li suddenly felt that all the hard work of writing the manual and standing on the podium was worth it.
The feeling of passing on knowledge and watching it take root and sprout in the hands of more people is wonderful, and it also gives her a new weight on her shoulders. She is not only a technical tackler, but also a sower.
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