Page 83 - ISCAR(HOLE_MAKING_CATALOG_65)
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USER GUIDE




          Troubleshooting
                         Cutting Edge Chipping
                       1  Check the stability of the machine spindle, tool and workpiece clamping rigidity.
                       2  Reduce feed rate, increase speed.
                       3  If the drill vibrates, reduce cutting speed and increase feed rate.                         INDEXABLE DRILLS
                       4  When drilling rough, hard or angled (up to 12° angular surface), reduce the feed rate by 30-50%.
                       5  Check cooling lubricant. Increase coolant pressure. In case of external
                         coolant supply, improve jet direction and add cooling jets.
                         Chisel Area Chipping
                       1  Reduce feed rate.
                       2  Increase coolant pressure.
                       3  Increase workpiece chucking force.
                         Excessive Flank Wear
                       4  Reduce cutting speed.
                       5  Increase internal coolant pressure.

                         Excessive Land Wear
                       1  Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial).
                       2  Reduce cutting speed.
                       3  When drilling rough, hard or angled (up to 12° angular surface), reduce the feed rate by 30-50%.
                       4  Increase coolant pressure.
                       5  Check the chisel point runout and make sure it is within 0.02 mm T.I.R.
                       6  Increase workpiece chucking force stability and rigidity.
                         Built-Up Edge
                       1  Increase cutting speed/feed.
                       2  Increase
                         Inaccurate Hole Position
                       1  Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial).
                       2  Check the stability of the machine spindle, tool and workpiece clamping rigidity.
                       3  When drilling rough, hard or sloped surfaces (up to 7°), reduce the feed rate by 30%-50% when entering.
                       4  Drill a pre-hole with a 140° point angle for centering.
                       5  Check the chisel point runout and make sure it is within 0.02 mm T.I.R.
                         Deviation of Hole Tolerance
                       1  Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial cutting points).
                       2  Reduce feed rate.
           Ø > D nominal + 0.15mm
           D nominal   3  Check the chisel point runout and make sure that it is within 0.02 mm T.I.R.
           Ø < D nominal - 0.03mm
                       4  Wrong cutting edge. Replace head.
                       5  Increase workpiece chucking force.
                       6  Increase internal coolant pressure.
                         Burrs on Exit
                       1  Reduce the feed rate by 50%-70% during exit.
                       2  Replace the worn head.

                         Surface Finish Too Rough
                       1  Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial).
                       2  Adjust the feed for improved chip formation.
               Ra      3  In case of chip jamming - increase the coolant flow and/or reduce the cutting speed.
                       4  Increase the coolant pressure.
                       5  Check the chisel point runout and make sure it is within 0.02 mm T.I.R.
                       6  Use pecking cycle.
                       7  Replace the drilling head.






















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