To lose control of the valve material, valve shaft from stainless steel ANSI420.

用于输料管的阀门，阀轴由ANSI420不锈钢制造。

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Shaft Change: Three kinds of cutting shafts for optional using on this machine, which use quick changing shaft according to different material.

快速换轴装置：本机器有三种切割轴可共选用，采用快速换轴方式，因应不同材料需求。

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As amount of material diminishes along the shaft the degree to which it can bend increases.

竿身材料物质缩减的程度将影响它可以弯曲的部位增加。

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Hecla has received approval from MSHA to remove the loose material from the shaft, said Phillips S. Baker Jr.

FORBES: Hecla Officials Anticipate Clean-Up Of Mine Shaft Can Begin In Few Weeks

The mine was shut down by the U.S. Mine Safety and Health Administration due to the unsafe buildup of sand and concrete material in the main shaft of the mine.

FORBES: Hecla's Lucky Friday Mine Rehabilitation Slightly Ahead Of Schedule, Restart In Early 2013

No production from the mine is expected this year after the federal Mine Safety and Health Administration ordered the Silver Shaft to be closed for removal of built-up sand and concrete material.

FORBES: Hecla Officials Anticipate Clean-Up Of Mine Shaft Can Begin In Few Weeks