This is a way to determine whether a table tennis ball is round or not. For beginners to choose a table tennis racket, technology can improve
Today we will answer two questions from golfers:
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1. As a table tennis fan, do you need to use a good racquet to improve your skills?
(1) Why beginners don't use expensive rackets for training
It is not necessary for beginners to use a good racket for training. For example, when you first learn to play, you can go directly to Languo Kuang. The bottom board is covered with more than 1000 fiber plates, reverse side is directly connected to tire. If you have too good a sole, too good elasticity, which does not contribute to stability of your movements, the ball will fly as soon as you touch it, and you will not feel it in your hands.
(2) Guidelines for choosing a sole board for beginners
Beginners need to get feeling when they first start playing, so blade shouldn't be too stretchy.
(3) Beginners may not choose bad rackets
Beginners should pay attention to choosing a racket that cannot be used too badly. For example, some people don't understand anything when they first learn to play ball. They go to supermarket to buy a racket that costs more than ten yuan for two and gives them some balls. movement and movement will be deformed and useless if you keep practicing.
(4) Racquet tips for beginners
Beginners should choose clean wood. It doesn't matter if you add carbon or not. The elasticity of pure wood blades is moderate. Beginners do not use sticky pads in beginning, opt for semi-sticky and semi-astringent pads or pads that should not be too stretchy when paired with this pad so they can better establish their own system of action for hitting ball. . If sole isn't as flexible, you'll figure out how to apply pressure and increase feel in your hand.
Second, what is error in millimeters for diameter of a three-star table tennis ball?
(1) Table tennis diameter error
Now it's a big 40+ ball. This 40+ does not mean that 41 (42) is called 40+. 40+ refers to 40–40.5 range called 40+. The error is usually around 0.1 (~0.2) and three star ball error is usually controlled at around 0.1. If it is a star or not a star, it can be around 0.3~0.4. Of course, this will not say that it is less than 40 mm. This is due to its manufacturing process. Table tennis is made of two semicircular balls with a seam. be too big.
(2) Table tennis measurement
Do not use a caliper to measure diameter of a ball. Some people even take a ruler to measure, but it is impossible to measure accurately. Table tennis balls are round and it is difficult to accurately measure diameter of ball when measured with a caliper. There are special devices for measuring table tennis balls. This is finding center of circle at 4 points to measure roundness of ball, so it makes no sense to measure size of ball with a caliper.
(3) The quality of table tennis depends on roundness
To judge whether a ball is good or not, it mainly depends on its roundness and elasticity. Roundness can put ball on table and rotate it to see if there is a lot of swing and vibration. If it rotates smoothly, if there is no big swing, then ball is relatively round, if ball shakes a lot, then ball is not very round. So we choose table tennis balls.
(4)Ball rotationLogo placement unscientific
Some say that when you turn a ball, you can tell if it's round by whether logo is on top or not. It makes no sense. Whether logo is on top depends on position of die, not whether ball is round or not.
A seam ball consists of two semi-circles, and place where two semi-circles overlap, that is, place of seam, is of highest quality. When turning, place with greatest mass will be at equator. If logo is printed directly on equator, logo will mostly rotate around equator; if logo is printed directly on north and south poles of ball, logo will be mostly on top.
So evaluating ball's roundness is to see if it shakes a lot. As a rule, slight shaking is normal.
Ping-pong network organized by Liu Baosheng
November 30, 2023
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