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In baseball, a corked bat is a specially modified baseball bat that has been filled with cork or other lighter, less dense substances to make the bat lighter. A lighter bat gives a hitter a quicker swing and may improve the hitter's timing. In Major League Baseball, modifying a bat with foreign substances and using it in play is illegal and subject to ejection and further punishment. To cork a bat, a hole approximately 1/2-inch (12.5 mm) in diameter is drilled down through the thick end of the bat roughly six inches deep. Crushed cork, bouncy ball, sawdust, or other similar material is compacted into the hole and the end is typically patched up with glue and sawdust. However, this weakens the bat's structural integrity and makes it more susceptible to breakage, even more so if the cork is placed beyond roughly six inches into the bat. Corked bats are typically discovered when they break during play. Using a corked bat in Major League Baseball is in violation of Rule 6.06 (d), which reads in full:〔"(MLB Official Rules, Section 6 )", ''MLB.com'' (accessed June 8, 2006)〕
Since , six players have been caught using corked bats. The following table summarizes these events: In addition, former player and Major League manager Phil Garner admitted in January 2010 on a Houston radio station that he used a corked bat against Gaylord Perry and "hit a home run" with it. == MythBusters test == According to the ''MythBusters'' August 8, 2007 baseball special, a ball hit by a corked bat travels at only half the speed of a ball hit by an unmodified bat, causing it to go a shorter distance. Additionally, the cork inside the bat actually absorbs the kinetic energy like a sponge, hindering the batter's performance. In addition, because corked bats are lighter, they have less momentum to transfer to the ball. This led to the conclusion that the use of a corked bat had fewer benefits over a regular bat. The show also notes that while filling a bat with cork makes it lighter, there is nothing in the rule book that prevents a player from simply using a lighter, uncorked bat. However, lighter wood bats are shorter than heavier bats (a baseball bat has a linear weight-to-length ratio referred to as "drop"); drilling out a heavier bat and adding a less dense filling allows the swing speed of a lighter bat with the plate reach of a heavier one, which may allow the batter to make solid contact with pitches more effectively. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「corked bat」の詳細全文を読む スポンサード リンク
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