percussion drilling การใช้

• Ancient percussion drilling methods became obsolete and most of the drilling rigs were torn down due to decay.
• Wealthy families of the Sichuan city of Jingyan invented deep percussion drilling techniques used in Zigong-400 years before the Europeans.
• Later, Europeans copied and further refined the percussion drilling methods-so its effects can be seen in the modern Drilling rig used for oil and water.
• In 1846, under the supervision of state advisor V . N . Semyonov engineer Alekseev drilled a 21 m deep well using a primitive percussion drilling mechanism, in BibiheybYt to explore for oil, with positive results.
• The " best of both worlds " is a single system capable of both " fine " and " coarse " melt expulsion . " Fine " melt expulsion produces features with excellent wall definition and small heat-affected zone while " coarse " melt expulsion, such as used in percussion drilling and trepanning, removes material quickly.