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303DEEP HOLE DRILLING%u00bd%u0009TroubleshootingProblem Possible Cause SolutionThe Drill BreaksOr Insert Chips%u2022 Chip evacuation problems. Center misalignment of drill to workpiece. %u2022 Check that the coolant passages are clear and that the Venturi slots are not damaged. Check center alignment of drill to workpiece. Check workpiece and drill clamping rigidity. Poor SurfaceFinish%u2022 Workpiece or drill clamping rigidity problem. Inadequate coolant oil. Cutting speed too low. %u2022 Improve workpiece or drill clamping. Check the coolant oil and replace if necessary. Increase the cutting speed. ExcessiveLeakage of theCoolant%u2022 Chips block the fluid passages. The drill was incorrectly assembled, or the Venturi slots of the internal tube are located in the wrong direction. %u2022 Clear the chips. Check all connections and the direction of the internal tube. InsufficientCoolant Flow At the Cutting Zone,Despite CorrectFluid Supply%u2022 Chips block the fluid passages. Worn bushing or sealing device. Venturi slots are too wide (worn). Internal tube shorter than the external tube. %u2022 Clear the chips. Check the bushing and seal and replace if necessary . Replace the internal tube. Replace the internal tube to one with a correct length. Chips Jam in theFront end of theDrill%u2022 Insufficient coolant flow. %u2022 Adjust the fluid flow by raising the pressure; check the filter and fluid quality.