most common mistakes during the drilling process with diamond core bits

Updated: Apr 30, 2020

Problem - 1

Core bit segment detachment or breakdown.

Cause

Core bit overheating due to poor cooling or lack of water coolant. Core bit jamming.


Solution

Increase cooling water feed. Check boring machine state and how it is fixed.



Problem - 2

Core bit overheating, discoloration.

Cause

Core bit overheating due to poor cooling or lack of water coolant. High rotation speed.


Solution

Increase cooling water feed. Reduce torque. Change to a cycle boring mode.






















Problem - 3

Segment outboard inclination

Cause

Abrupt start. High-torque boring with grease on the segment. The selected segment is too hard.


Solution

Operate more smoothly. Open up the segment as per the instruction. Use core bit with a softer segment material.




Problem - 4

Segment inboard inclination.

Cause

Abrupt start. A rebar tangent to bit diameter. The bore-out diameter is too big.


Solution

Operate more smoothly. Displace the hole, if possible. Otherwise, set the lowest torque and feed the core bit as smoothly and slowly as possible.



Problem - 5

Fracture or cracks in core bit body

Cause

Uneven body wear due to wobbling, lateral loads, beating. Load increase while boring, core bit jamming.


Solution

Change to smoother operation or cycle boring mode. See Operation article here for more information about core bit jamming and core extraction.



Problem - 6

Increased wobbling

Cause

Looseness and play in core bit to boring machine coupling. Uncleaned seats. Core bit body deformation.


Solution

See Proper Installation article here for more information or Replace the core bit



Problem - 7

Core bit body deformation (ellipse, dents)

Cause

Body wobbling. Core bit jamming.


Solution

See Operation article here for more information about core bit jamming and core removal.




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