There are two types of bowling balls: public balls and special balls. The structure of the public ball is relatively simple, and a round core can be wrapped with a layer of the outer shell, so the performance of the public ball is poor. The structure of the special ball is more complicated. It consists of three parts: the inner core, the weight fortress, and the outer shell. The core is a filler such as plastic or other ceramics to ensure standard weight. The Weight Bastion is a composite of heavy plastic particles. It comes in shapes like fortresses, blocks, bulbs, mushrooms, etc.
This special shape is to ensure that the ball has a weight compensation after drilling, creating an unbalanced weight. The shell is usually made of viscose or resin, which is commonly referred to as artificial rubber and polyester. In recent years, special balls are mostly made of active resin as the shell.
These three parts are combined through high-precision machining technology to become a sphere with a smooth surface, certain hardness, and standard weight. Various special balls have different performances, such as shell weight and core weight, large and small hook coefficients, and so on. In addition, the surface of the ball is polished into various roughnesses, that is, the so-called smooth surface and frosted surface. Compatible with a variety of fairway surfaces.
The production process of bowling balls is complex. First, the core of the ball is poured, and then the fortress of the ball is poured into the mold for pouring the fortress. The fort is made and fixed in the mold of the shell, and the whole ball is poured out. Finally, polishing is carried out, and identification marks such as trademarks are engraved. Except for the brand name, trademark, serial number and weight fortress, and other identification marks of the ball, the surface of the ball is not allowed to have any unevenness.
The ball is divided into six parts: top (top), bottom (bottom), front, back, left, and right. Identification marks such as the fort and the center of gravity are on the top of the ball. The hardness of the ball is divided into three categories: soft, medium and hard.
There are ten squares in each round, and each square contains two balls. There are ten pins in total. Try to knock down all the pins within two balls. If you knock down all the pins in the first ball, that is, "STRIKE", an "X" appears on the screen, even if you have completed the first ball.
If the grid is reached, the score is 10 points plus the number of downs for the next two balls. However, if the first ball is not completely down, another ball must be played. If the remaining pins are all down, that is, "SPARE", and "/" appears on the screen, it is considered to complete a grid, and the score is 10 points. Add the number of pins for the first ball in the next grid.
But if the second ball does not knock down all the pins, the score is the first ball plus the number of pins downed by the second ball, and then the next frame. And so on until the tenth square. However, there are three balls in the tenth square. If the first ball or the second ball knocks down all the pins in the tenth square, a third ball can be played.
The race is determined by drawing lots. Each inning is played on an adjacent pair of fairways, with fairways swapped each round until the end of the game. In the second inning, the fairways are swapped, with odd-numbered players moving to the left and even-numbered players moving to the right.
Sometimes it is also possible to move the passes to the right in unison, in order for each player to meet and have an equal chance. The order of pitching is based on the order of A, B, and C drawn.