hristina
Originally published as [Fun Physics] How do you make a tape measure that you can "whoosh" away with a click? Previously, in "Disposable tea bags, how to wrap tea with filter paper?"? In Funny Made, the cutie asks, "How is a tape measure made?"? Vaguely felt as if it had been written.. At the beginning of the year, I was asked again, "What happened to the tape measure?" This time, I completed another piece of my memory puzzle. Recently, I finally remembered it completely. It's a collection of mechanical principles published by Guoku- "How do tape measures, ATMs and toilets work?"? A set of gifs to solve your years of doubts! ！ Last time, I only introduced the principle, but not the production process. Today, I will introduce this spring retractable tape measure which is used to measure furniture and head in many cute homes! Make a ruler strip Many tape measures use a steel rule, which is first primed using a series of rollers. In order to make the contrast between the red and black scale and the background color more obvious, the ruler will be dyed yellow. Expand the full text The painted steel bar will be rewound and waiting for the scale to be printed. The cylinder printing machine will spray ink on the ruler to make a scale. In order to protect the scale from wear, the tape measure is heated and thermoplastically attached with a protective plastic film. Press and bend the ruler strip A continuous roller is then used to press the tape into a concave profile. After the two sides of the tape measure are bent, the tape measure can be kept straight when being stretched,custom tailor tape, and is not easy to bend. What can I say? It may be "rather bend than break"! Looking at the slow close-up below, there is a gap in the middle of the bottom wheel, and the upper wheel presses down the ruler, thus forming a concave shape. Cut the ruler strip Now we need to cut the ruler into individual pieces. Let the passing ruler slow down somewhere and then cut. When the laser senses this part, it cuts off, which is exactly the length of the tape measure of 5 meters. At the same time, the end is perforated to facilitate the installation of the ruler hook. The ruler hook is the fixed thing in the picture below. When I was a child,custom tape measure, I stepped on this part with my big toe and measured my height. Of course, the palm on the top of the head must be turned up, so that the measured height will be slightly higher than the actual height.