Page 230 - Threading_Handbook
P. 230

THREAD MILLING  3.15  Troubleshooting              Cause                 • Reduce cutting speed



                          Problem
                                                                                            Solution
                                            • High cutting speed
                                            • Chip too thin
                                                                               • Increase feed rate and
                                                                                 reduce radial passes
                                            • Insufficient coolant
                                                                               • Check coolant pressure




                         Flank Wear                                              / flow direction
                                            • Vibration                        • Check stability
                                            • High load on cutting edge        • Reduce feed rate
                                                                               • Add radial passes






                       Fracture/Chipping
                                            • Cutting speed too low            • Increase cutting speed
                                            • Insufficient coolant             • Check coolant pressure
                                                                                 / flow direction







                        Build up Edge
                                            • Feed rate is too high            • Reduce feed rate
                                            • Large profile                    • Add passes
                                            • Thread length too long           • Add radial passes
                                                                               • Reduce overhang







                    Thread Surface-Chatter
                       Marks/Vibrations
                                            • Tool deflection                  • Reduce feed rate
                                            • CNC program error                • Add radial passes
                                                                               • Use ZERO compensation
                                                                               • Check CNC program



                       Thread Accuracy
                      (GO/NOGO Gauge)












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