Blast Furnace Cast House and its Operation The blast furnace (BF) cast house is the working area where hot metal and liquid slag are tapped from the blast furnace and either poured into ladles (torpedo car or open top ladle) or led off for solidification (pig casting and slag granulation) or treatment (cast house desulphurization).
Centre won't be hard. Thin case only. A through hard axle will snap like a rotten carrot if you boot it. If the end is hard knocking 10 thou off with a grinder should shift it then you can drill and tap in the usual fashion but use a quality drill and quality taps as the steel should be hunky stuff.
A drilling rig is a machine that creates holes in the earth's subsurface. Drilling rigs can be massive structures housing equipment used to drill water wells, oil wells, or natural gas extraction wells, or they can be small enough to be moved manually by one person and such are called augers.
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