Page 93 - 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 sloped surfaces (up to 7°), reduce the
                                  feed rate by 50-70% when entering and exiting.
                                5  Check cooling lubricant and 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
                                1  Reduce cutting speed.
                                2  Increase internal coolant pressure.


                                  Excessive Land Wear
                                1  Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial).
                                2  Reduce cutting speed.
                                3  When drilling rough, hard or sloped surfaces (up to 7°), reduce the
                                  feed rate by 50%-70% when entering and exiting.
                                4  Increase coolant pressure.
                                5  Check the chisel point runout and make sure it is within 0.03 mm T.I.R.
                                6  Increase workpiece chucking force stability and rigidity.


                                  Built-Up Edge
                                1  Increase cutting speed/feed.
                                2  Increase coolant pressure.


                                  Deviation of Hole Tolerance
              Ø > D nominal + 0.15mm  1  Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial cutting points).
              D nominal         2  Reduce feed rate.
               Ø < D nominal - 0.03mm
                                3  Check the chisel point runout and make sure it is within 0.03 mm T.I.R.
                                4  Worn cutting edge. Replace head.
                                5  Increase workpiece chucking force.
                                6  Increase internal coolant pressure.
                                  Surface Finish Too Rough
                                1  Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial).
                  Ra
                                2  Adjust the feed for improved chip formation.
                                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 0.03 mm T.I.R.
                                6  Use pecking cycle.
                                7  Replace the drilling head
                                  Hole Not Straight
                                1  Drill a pre-hole for centering (check recommendations for pre-hole operation).
                                2  Increase coolant pressure, improve jet direction in case of external coolant supply.
                                3  Increase the feed.
                                  Inaccurate Hole Position
                                1  Check the runout and make sure it is within 0.03 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 50%-70% 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 0.03 mm T.I.R.
                                  Burrs on Exit
                                1  Reduce the feed rate by 50%-70% when exiting.
                                2  Replace the worn head.



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