Yuki Precision made the championship win in Coma Battle can be rotated quietly for more than 3 minutes

"February 2 was held in Yokohama"All Japan Manufacturing Industry Combat World WarYuki Precision which paid the victory at "SEIMITSU COMA"Is a powerful coma that keeps rotating for more than about 3 minutes while being a small size less than 2 cm.We also produce parts for artificial satellitesIt seems that it has become a serious specification beyond the range of toys produced by gathering the company's precision processing technology's styles so we decided to actually buy it and see if it can be turned steadily for a long time did.

Purchase is "BRANCHFrom the website of. The price is 840 yen including tax, shipping fee is 350 yen nationwide. If you buy 10 pieces, it will be 1 735 yen.


I entered the envelope with such feeling and arrived.


This time I bought 3 pieces.


Since the bag has a zipper, keep it tightly closed and keep it safe without loss of contents.


I tried out it from the bag. It is small enough to get on the tip of the finger.


It is about this size when compared with 10 yen coin. I can imagine that it is difficult for amateurs to precisely process metal with this size.


Weighs about 3 grams each.


I tried arranging three. Because it is made of stainless steel it is glowing dull silveryly, and it is designed so as not to feel strange even if it is decorated on the desk or shelf.


The part of possession is grooved with handmade by craftsmen one by one.



I found a step that is concentrically attached from the rotation axis. It may be a secret that the structure around here can keep rotating for a long time.


The part in contact with the floor during rotation is like this. The tip is sharp as painful as pressing your finger.


I looked at the tip part from directly above. The center of the circle is made to be sharp without deviation of the size.


When turning, pinch with your fingertips as follows and twist vigorously.


It is actually appearing.



As the axis becomes perpendicular to the floor, it continues to rotate steadily enough to make it look as if it is stationary.


Here is the movie where you can see how long you can keep rotating it. There are scenes that seems to be "too stabile" in a sense of stability, but all the time, from the start of the measurement with the stopwatch until stopping, the frame continues to rotate. In addition, although the coma raises the beat when it is turned all the time, it can be seen at the beginning of the movie.

Continue to go around more than 3 minutes with a sense of stability as if it is still - YouTube


Because it is a product that you can experience the underpower of Japanese manufacturing industry whilst it can be purchased easily on the net, those who want to experience the technology by turning with their own hands is a necessity check.