Soccer ball

Soccer ball. It is used in the most popular sport in the world, the team soccer game played between two sets of 11 players each and one referee who is enforcing the rules.

Summary

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  • 1 Features and measurements
  • 2 Manufacturing
  • 3 Sewing
  • 4 Sources

Characteristics and measurements

  • Measurements: A circumference of between 68 and 70 centimeters (inclusive).
  • Weight: Between 410 and 450 grams (inclusive) at the beginning of the match.
  • Inflation pressure: 1.6 – 2.1 atmospheres (600 – 1,100 grams per square centimeter) at sea level.

Manufacturing

Although the soccer ball is called “spherical,” the most common soccer balls are truncated icosahedrons with 12 pentagons and 20 regular hexagons . The faces are not completely flat, if not slightly curved. FIFA defines three different levels of quality for soccer balls: FIFA approved .

Sewing

  1. Use strong, thick threads of cement, kapronovye. You will need a loop, and loop. Your make it yourself, for this, take elastic steel rope diameter from 0.4 to 0.5mm, it will be enough with two centimeters of metal wire for making bows. Heat half of the string cut over the candle flame, then fold it in half.
  2. Now, making the hinge lever, which was like pulling a thread. Take a metal bar with a diameter of 8 to 10 mm and tighten at its mid ends of the rope. This requires an m5 – m6 screw. Pre-drill a hole under the thread. Now improve the knot a little at the end so that the thread is held. Give it the shape of a small hook.
  3. And directly on the shwe. Soccer balls are made up of piatiygolnyh drawing, which have ready the holes of the threads. A part of the pentagon – a seam. To sew take about fifty centimeters of thread. The inner podshivaite ball of thread sewing should be inside.
  4. First rassheite break the seams and make sure the ignition doesn’t agree. The knot is usually found near a corner of the pentagon. If he is gone – tie. Repeat two or three times.
  5. Now in this hole you miss the clip. She has to pass through the two openings of the sshivaemyh piatiygolnikov.
  6. Insert the end of the thread into the loop, and drag it through the holes. The ends of the threads must be the same. After this double knot knot. Make node, such that he was inside the ball.
  7. Then insert the clip on the right into the next two sewing holes and pull one end of the thread from the left to the right. Then drag the end of a thread and insert the clip into the same two holes in the seam on the left, then pull the other end of the thread from right to left.
  8. Next and repeat the process. When you reach the corner of the pentagon, tighten the thread, pulling on both ends, and adjust the knot four times. If the thread will stay in the next seam – continue. If not, cut out and start sewing again. The reserve of the seam does not squeeze too hard, and the phosphor wood push knot inside the ball.

 

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