Transcription
Hello, I am Jo Han-bi, the CEO of Seungbaek Scissors. Today, I would like to explain how to do good after-sales service. In truth, I cannot reveal all the know-how I possess in this video. The reason is not that I am unwilling to share, but rather that it is difficult to capture in a video. It is a time-consuming task, and because it is my work, I cannot convey 100% of it through video. I want to share at least a little of my method for those who wish to do good after-sales service, focusing on the parts I particularly want to emphasize.
As you can see here, this is not a guide for servicing scissors. This is a guide in the process of creating new scissors. These two pairs in front are scissors that were processed 100% in Japan, from Yamamura. They are imported scissors. And these two pairs above are scissors that I personally produced at the factory. And the scissors remaining are those that still need to be processed on this surface and the back of the blade, and then completed as scissors.
When you look at them like this, they are almost identical, only the color is slightly different. So, first, I will explain using these two products that are produced at our Korean factory. Scissors, these scissors, have a concept of space called XYZ for the surface, the back of the blade, and the bottom of the blade. What is that? To process this surface, this surface, and the back of the blade, you need to process three spatial planes called XYZ. The first, X, is the thickness of the blade, isn't it? To make this part thin so that the bottom surface and the back of the blade can meet, it needs to be made thin. The first grinding action that thins this part, when it flows from here to here, is X. This is X. This is X. X, X. When you draw this X all the way through, this part will become thinner, won't it? This part will become thinner. Let's take a look.
[Music]
Comparing the part that has been worked on and the part that hasn't, the thickness has been significantly reduced, hasn't it? It has changed. You can see that it is much closer to the blade's edge. The color is also different. We have processed about half of this part. This is X. X. It is read as approaching the blade's edge. However, for scissors that have undergone after-sales service, the X has already been set by aligning the inner and outer surfaces to sharpen the blade, so there is no need to specifically look for X. If the inner and outer surfaces meet, the value of X is complete.
Now, let's try to find the value of Y. This is important, so please listen carefully. You really must listen carefully. I want to honestly tell you that this logic, which I have found over 23 years without compromising with myself for a single day, is true. And I want to tell you that it is a very difficult technique, and you must work very hard and diligently to learn it. And it will probably be difficult even for experienced professionals. However, I am filming this video with the hope that it will be a guide for someone.
If you had a Bible next to you, I would place my hand on it and tell you, without a single lie, that I look at the entire curve from the tip of the blade to the starting point of the blade, and here, the back of the blade. If we consider scissors that have undergone after-sales service, I look at it. The important thing is to divide this part from the tip to 3mm, 3mm, 3mm, 3mm, 3mm, 3mm, 3mm, 3mm, 3mm, 3mm, 3mm, 3mm, and view it in segments of 3mm. When this 3mm is magnified, let's assume this entire section is 3mm. So, we are currently processing this long pair of scissors. This 3mm, when this 3mm gap is magnified, let's assume it's this big. Then, if we divide it in half, this is 1.5. Here, this is the blade's edge. Even within this 3mm section, there is a peak of the curve. The highest point. When you look here, there is a curve. This is also a curve, so even if it's measured in millimeters, there is a curve here. There is a curve here, and a curve here, and a curve here. You have to find that curve. The highest point. It should be placed like this. At that time, the important thing is, when you find this 3mm and the peak of this 3mm curve, it should not be twisted or bent like this. If this shoulder is in a straight line with the grinder, and you draw a line from the center of the bolt here to the tip of the blade, you must move along that axis line. You should not move like this. You should go like this. And most people move like this, like this, but I do not move like this. I personally believe that the more you move, the more unstable it becomes. Others may have different methods, but I do not do it that way. I do not move like this. Unless it is a special case, I move like this from this position. I have stabilized my technique in that way because I believe it is the most efficient. Let me say it again. And you continue to find the peak in this 3mm. Like this. By doing so, let's find the value of Y.
[Music]
First, we found the value of X, and then we found the value of Y using vertical movement. I mentioned 3mm, 3mm, 3mm. However, as you observe the nuance, there is a cushion behind it. This grinding tool is a cushion, so even if it's 3mm, a larger area touches. However, I consider the nuance of the grinding and think of the 3mm concept, so I process a larger area simultaneously, but it's not that I don't look at the 3mm at all.
Now, let's try to find the value of Z. The value of Z is nothing other than that most people, almost everyone, only think about the values of X and Y and move like this on a disc, or like this. And there are also people who go like this. Honestly, there is no single right answer in the world. No matter how you do it, if you find it difficult, you can try someone else's method and find your own. So, what I want to explain now is that on this disc, while processing this surface like this, you sharpen the blade like this. However, in most of these methods, I think people fail to find the value of Z. The value of X, Y, and this Z, the Z value flowing in this direction. If you find this Z value, the cutting power will be completely different. Finding the Z value, rather than just X and Y, greatly helps with cutting power. At this time, how do you look at it? You might think, "It looks good, what else do I need to do?" If it turns out well, that's fine. But I'm talking about when it doesn't turn out well. When it doesn't turn out well, you need to work hard until you have the skill to find the excess material flowing in this direction. And there is something important. Look closely at the groove inside here. See how the light flickers inside here? The Japanese ones also have grooves on the bottom. Look here, here too. As I said before, you were told to divide it into 3mm segments and look. But beyond that, you need to be able to visually read whether the direction of this groove inside is straight or flowing downwards. If you cannot read this flow inside, you will suffer for life. You will suffer for life. You will never be able to find the concept of scissors. If you say you found it without looking at this, when you repair multiple pairs of scissors, and put the same scissors in to repair them, you might get a different feeling from each one. However, if you can read this inside groove and have the vision to divide and look at the 3mm intervals, you will achieve your wish for scissor blades. I have no doubt about the logic I am explaining. I have no shame about it, and I can show results that can be responsible for almost 99.9% of what I say, with the data and skill I possess. I want to appeal to you with that.
Now, let's find the value of Z. I have found the value of Z. Look at the thickness; it has become much thinner. It has become much thinner. But before heat treatment, and why would you grind it thin before heat treatment? Some people might think it would be easier. However, the concept of scissors is that you cannot process this part thinly just before the inner processing is finished. To process the inside here, this thickness must remain substantial. That's why making scissors is so difficult. If you could process the inside here after making this part extremely thin, it would be great. But if this thickness is thin while processing the inside, the blade will warp. So, the concept of scissors keeps warping, and the algorithm for making scissors becomes extremely complex. Therefore, you cannot grind it thin in advance. And I want to tell you that a person is much better at grinding this thick material thinly than a machine. This is it. This sandpaper is 40 grit. After this 40 grit is finished, then 80 grit, 80 grit, then 180 grit, 180 grit, and then not just up to 600 grit, but after up to 600 grit, apply polishing compound and process it finely. Then, when you polish it, it shines brightly.
Today, I wanted to show you how to process the back of the blade. And from this state, you continue to alternate between sandpapers, doing the same thing. You do it four times. Four times. The blade thickness is very different. Now, I will try to process this part at a fast speed. This is 180 grit. Some people do the XYZ grinding that I am doing now on this disc. I don't do this work on this disc because the rotational speed here and here are different. The amount of grinding is also different. So, I don't do it here. And if you do the work of the groove on this disc, it seems to go well, but there can be excess material. Experienced people can do it here, but beginners should not do the back of the blade grinding here. It would be better to use a grinding wheel like this. The grinding process up to the point of sharpening the blade is complete. It is complete. Now, let's try to process the eyebrow area. Let's try to process the eyebrow area. At this time, we blunt the corners a bit like this, blunt it like this, and it seems to be perfectly aligned. It seems to be perfectly finished. The remaining minor imperfections can be perfectly addressed while sharpening the blade. For those who do after-sales service, you probably don't need to watch the part about alternating sandpapers. Watch it for the main context, and if you see me doing a grinding method that you don't do, find it and use it after watching the video. You don't have to follow everything. I am just leaving behind this kind of video as a record, so I have shown many processes. You can watch what you need and find your way.
If there is one more tip I want to give you, it is that after grinding, when you look at it, the feeling, the flow of this surface and this surface should be well balanced. Let me say it again. The flow of this surface and the flow of this surface should be well balanced. When you look at it like this, the balance should be precise, and it should pull straight. If this surface is twisted like this, this surface and the bottom surface should be the same. The flow of this surface and this surface should be almost the same. It should align perfectly like this. If it suddenly decreases like this, the cutting power will not be good. Let me say it again. It is very important for it to pull straight like this. And when you look at it like this, the feeling should be very different. The curve of this blade, the flow here, and the flow of this should be beautiful. This is something you see when you are skilled. The feeling when you look at it like this, and the feeling after processing, should be very different. It should have a beautiful feeling, like a bamboo leaf. Like a bamboo leaf. Now, I will quickly go and polish it over there. Just a moment. I have polished it a bit over there. The subtle aura, the light flowing to the blade's edge. It is consistent. If you make this light well, your wish for scissor blades will be fulfilled. And I can promise you that I can provide a lot of technical help in fulfilling that wish, and that I can teach you without any lies.
Next, we will balance it by hitting it with a hammer. That will be serialized in the next episode. Thank you. This was Jo Gwang-bae, CEO of Seungbaek Scissors.