Easy Operation Reaming Shell Constant Correct Hole Diameter Remain
Main Features
The reaming shell is usually situated between the outer tube and the coring bit. The purpose of the reaming shell is two-fold: to gauge the hole diameter and to stabilize the core barrel during the drilling to avoid the vibration,and also, associated with stabilizer, the deviation. This stabilization helps to avoid premature wear on the outer tube of the core barrel.
Diamond Reaming Shell is connected with a Bit to be used, and the drilling by Bit and grinding of side surface can be done simultaneously, but the drilled hole should be kept not smaller than the diameter of the Bit (Reaming).
It should be used to prevent early wear and tear of the outer diameter of the Bit, and also to prevent vibration and deformation of the hole walls.
As shown in the figures, it has a cylindrical shape, with diamond particles attached at outside diameter and touchable screws at both ends.
Reaming shell is produced with the outside diameter larger than that of the Bit.
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Bit type
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Description
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Set type of Diamond
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Remarks
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Wire-line
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dia. 56, 59, 75 and 95,
BQ, NQ, HQ
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Impregnated
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Couple tube
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dia.56, 59, 75, 76, 91, 110, 130 and 150
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Impregnated
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Single tube
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dia.46,56, 59,75, 91, 110, 130, 150, 171, 223 and 300
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Impregnated
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Reaming shells are usually situated just behind the core bit and serve two very important purposes.
The reaming shell maintains a constant and correct hole diameter, and also stabilizes the core barrel during the drilling operation, preventing vibration and hole deviation. This stabilization helps in core recovery and avoids premature wear on the outer tube of the core barrel.
The outside diameter of the reaming shell is fractionally larger than the outside diameter of the core bit. It is important to make occasional checks on the outside diameter of the reaming shell. If the hole becomes undersized due to excessive wear on both core bit and reaming shell, when the bit is eventually replaced, the new bit will become quickly damaged by reaming out an undersized hole.
Reaming shells are available in two types. Tungsten carbide (TC) reaming shells are for use in soil, clay and soft rocks. Diamond reaming shells are used in harder rocks. Diamond reaming shells consist of premium grade natural diamonds set into spiral panels on the outside diameter of the shell.
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Easy Operation Reaming Shell Constant Correct Hole Diameter Remain Images
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