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Now think of two wings or cutting blades hinged at the top. The hinge slides up and down in slots. The pier is drilled (12″ Auger) and then bell rig goes to work 2nd. Belling tool is placed on the bottom of the hole. Apply down pressure and then spin the tool. The down pressure causes the wings to come out cutting a bell shape.

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The two wings of our PDC roofbolt drill bit adopt PDC (Polycrystalline Diamond Compact) as the cutting tooth, the application of PDC has greatly improved the drilling efficiency of roofbolt drill bit, and is taking the place of tungsten carbide roofbolt drill bit

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Basically you have two wings, one on each side, that come out and they are hinged at the top. 2.5″ HEX ADAPTER REQUIRED ON AUGER. Imagine a piece of pipe with a trap door bottom. Now think of two wings or cutting blades hinged at the top. The hinge slides up and down in slots. The pier is drilled (18″ Auger

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PDC Roof Bolt Drill Bit Two Wings PDC Drill Bit Anchor Drill Bit. About Products. ZuanLong PDC anchor shank drill bits are mainly used to drill the roof and side supporting hole, the gas drainage, water infusion, geological exploration hole and grouting hole and so on for the coal mine seam, water conservancy and hydro-power, dam and roadway construction of bolt-mesh support.

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Roofbolt drill bit is a kind of drilling tool for fixing anchor bolt of coal mine. The two wings of our PDC roofbolt drill bit adopt PDC (Polycrystalline Diamond Compact) as the cutting tooth, the application of PDC has greatly improved the drilling efficiency of roofbolt drill bit, and is taking the place of tungsten carbide roofbolt drill bit gradually.

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Basically you have two wings, one on each side, that come out and they are hinged at the top. 2.5″ HEX ADAPTER REQUIRED ON AUGER. Imagine a piece of pipe with a trap door bottom. Now think of two wings or cutting blades hinged at the top. The hinge slides up and down in slots. The pier is drilled (18″ Auger) and then bell rig goes to work 2nd.

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