Tyrolit - Product range of diamond tools Page 336
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SAFETY 334 Trouble-shooting Wet core drill 1. Excessive wear of diamond segments – Insufficient coolant supply. Adjust the water supply and / or check the water lines. – The operating speed of the core drill is too low. Increase the RPM (see RPM recommendations). – The engine power is too high. Match the motor power to the drilling diameter. – The machine is vibrating. Fix the drill rig and / or check the general state of the machine (e.g. bearings and rollers). – The selected core drill may not be suitable for the material being drilled, or the material is too abrasive. Use a harder specification (e.g. CDL - CDM). 2. Excessive wear of the steel tube – The machine is vibrating. Fix the drill rig and / or check the general state of the machine (e.g. bearings and rollers). – The core drill is warped / is not running true. – The core drill is not fixed properly. Check if the core drill is aligned with the motor spindle. – There are remains in the hole, which have not been removed by the coolant. Increase the coolant supply temporarily. – You are drilling in loose material (e.g. gravel). 3. Broken segments – In case of brazed segments, a short interruption of the cooling can lead to overheating and thus to a destruction of the soldered joint. – The core drill has struck multiple times against reinforcements or fragments. Remove all loose steel and segment parts before introducing a new core drill. – Re-sharpen the drill bit by drilling into soft, abrasive material or use a Tyrolit sharpening plate. – The operating speed is too high. Reduce the RPM. – The grinding pressure is too low. Increase the pressure. – The engine power is too low. Match the motor power to the drilling diameter. – The core drill is cutting into loose reinforcement. Reduce the RPM when drilling reinforcements in order to avoid damage to the core drill. – Excessive coolant supply, only clear water is coming out of the drill hole (no slurry). Reduce the coolant supply and check the consistency (should be milky/cloudy). 4. Drill bit does not drill – The material may be too hard for the used specification. Use a softer specification (e.g. CDL CDM). Segments are overloaded Flat segment surface, possible deformation of the segments, high number of pull-outs (> 50 %), drill chatters – The operating speed is too low. Increase the RPM. – The grinding pressure is too high. Reduce the pressure. – The material may be too soft and abrasive for the used specification. Use a harder specification (e.g. CDL - CDM). 5. Drill bit does not drill Segments are underchallenged Smooth segment surface, polished diamonds (shining, no sharp edges) – The diamond segments are smooth (polished). 6. Core drill is jammed – Debris is blocked between the core and the tube wall (steel, pieces of material). Remove the drill rig and, using a wrench, turn the core drill alternately in both directions until it can be removed. Take the debris out of the drill hole before introducing a new core drill. – The drill rig was not fixed correctly and has moved during drilling. Drill rig and core drill are no longer aligned. Align and re-fix the drill rig.
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