1503 PROBLEM Excessive margin wear High flank wear Hole lead off Hole out of position Hole out of round Notching of insert Oversize hole Poor hole finish Poor tool life Power fluctuation of load metre Retraction spiral Step burnt on insert 1,2,3,4,27 1,2,3,4,27 1,2,3,4,27 1,3,4,5 1,3,4,5 1,3,4,5 1,3,4,5 2,6,7 2,6,7,27 2,6,7,27 2,6,7 2,6,7 2,4,8 2,4,8 2,4,8 8,9,10 8,10,26,27 8,1 8,9,10,27 11,12,13, 19,20 11,12,13,14 11,12,13,14 11,12,13,14, 19,20 11,12,13,14 11,12,13,18, 20 2,15,16,17 2,4,15,16, 17,27 2,4,15,16, 17,27 2,4,15,16,17 2,15,16,17 2,15,16,17 2,15,16,17 12,18,19 20 12,18,19,20 12,18,19,20 9,20,21, 23 9,20,21,23 9,20,21,23 9,20,21,23 12,19,24, 25 12,19,24,25 12,19,24, 25,27 12,19,24,25 12,14,19, 24,25 12,19,24, 25 12,19,24, 25 2,23,27 2,23 2,23 15. Pre-mill or spot face entry or exit to remove interruption. 16. Decrease feed up to 50% through entry or exit interruption using Nyloc screws to retain insert. 17. Use short holders in low impact entry cuts. 18. Reduce speed if a step or burn diameter is worn on insert. Calculate the speed at worn diameter, reduce the velocity by 10% and apply to original tool diameter. 19. Improve quality and condition of coolant (water soluble preferred at 7-8% dilution with EP additive.) 20. Use more heat and wear resistant tool grade. If using powder steel 15 use powder steel 25. if using powder steel 25 use carbide. If micro structure problems presents, use more wear resistant coatings (ask us for special coatings) 21. Anneal or normalise parts if all cutting tools exhibiting poor tool life. 22. For hard spots, use tougher grade tool steel with high wear resistant coating (i.e. if using carbide use Powder steel 25. If using Powder steel 25 use powder steel 15. Use a special coating (available on request) 23. Reduce feed, but not below threshold of good chip formation. 24. Increase feed to recommended levels. 25. Contact Karnasch for special geometry on request. 26. Increase rigidity of set up. 27. Explain your problem for making a special geometry insert. SPATENBOHRER • SPADE DRILL 10 Index 9 8 OIL 7 MACHINES 6 5 4 3 2 1
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