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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