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How Are Bowling Balls Made?

How Are Bowling Balls Made?. By: Jacqueline Philp & Cienna Ribblett. Raw Materials. Urethane A form of carbonic acid Plastic Polymers of isoprene units and other natural materials Reactive Resin A material made of Urethane and natural Resin Wood Lignum vitae. What they were Made of.

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How Are Bowling Balls Made?

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  1. How Are Bowling Balls Made? By: Jacqueline Philp & Cienna Ribblett

  2. Raw Materials • Urethane • A form of carbonic acid • Plastic • Polymers of isoprene units and other natural materials • Reactive Resin • A material made of Urethane and natural Resin • Wood • Lignum vitae

  3. What they were Made of • Bowling ball materials have evolved • From Lignum Vitae, a very hard wood- Wood balls are now just museum pieces • To rubber- Rubber balls are almost as hard to find. They may be found in bowling alleys on racks for those who don't own their own ball to use. • To plastic balls • To urethane balls • To reactive urethane balls • To particle balls • To epoxy balls

  4. How Bowling Balls Are Made • Bowling balls have been made with a core made of one material, a spherical “cover” or “shell” and a “pancake” weight block of denser material intended to compensate for the gripping holes.

  5. Facts • Bowling balls look simple • Prices for a ball can range from less than $50 to around $300 • Bowling balls travel up to and maybe over 20 mph. • First rubber bowling ball was produced in 1905 • Polyester balls were developed in the 1970s • 1980s were when the Urethane balls were invented • 1990 was when the idea of a metal core for bowling balls was first developed

  6. Step By Step ProcessSteps 1-2 • Making the core 1. A mold is formed to the core shape developed during the computerized design process. The appropriate material is poured into the core mold and left to harden. The solid core is removed from its mold. 2. Sometimes there is a second step to finish the core. For example, some ceramic cores are fired in a kiln. Compound cores are formed by inserting the first core into a second mold and pouring material of a different density around it.

  7. Step By Step ProcessSteps 3-4 • Forming the shell 3. The core is placed inside a spherical mold called the cover mold. The core is attached to a pin that points in from the shell of the mold. The pin holds the core in the right position. If the pin points toward the center of the mold the core is pin in. If it is tilted away from the center the core is pin out. 4. The cover material is poured into the mold, encasing the core, and is left to harden. The thickness of the cover may be as little as 1 inch or as much as 2 inches depending on the design of the particular ball.

  8. Step By Step ProcessSteps 5-6 • Filling the gaps 5. When the ball is removed from the cover mold, there is a hole where the core-holding pin had been. A plastic dowel is inserted into the hole and cemented in place. The pin is a different color than the cover. After the ball has been bought, the pin will be used as a guide for positioning the finger holes to take advantage of the core’s design. 6. Fill material is added to the logo imprint that was molded into the ball. The logo is located at the top of the ball.

  9. Step By Step ProcessSteps 7-9 • Finishing 7. The ball is finished to the right size by turning it on a lathe (a machine used for cutting, drilling, sanding, or shaving) and shaving off enough cover to get the right shape or it may be done on a center less grinder that scours (cutting the ball down) the ball into the right size and roundness. 8. Finally, the surface of the ball is finished to the right texture. It is sanded to an appropriate degree of polish, expressed by the roughness of the sanding material. 9. The ball is boxed and shipped to the company's distributor. And that is how they make bowling balls.

  10. A video to watch • http://www.youtube.com/watch?v=qTUHnvZSnns&feature=related • http://www.youtube.com/watch?v=mDtS955HnD0 • http://www.youtube.com/watch?v=z5oao9kPQ1U&feature=related

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