수고하셨습니다 The method of working the casing and hammer at the same time is very good. Can you explain the first hammer and bit?
@brandtu7527
11 ай бұрын
The hammer is a high wind pressure down-the-hole hammer. The drill bit is an eccentric drill that can be opened and closed. This kind of eccentric drill bit can pass through the outer casing in a closed state, and then open after passing through the outer casing. This will catch the head of the outer tube. Drill the outer casing and drill bit together.
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