Troubleshooting guide for tapping Problem Tapping oversized threads (no-go gauge is too loose ) You used improper tap for material and thread applicat

Troubleshooting guide for tapping Problem Tapping oversized threads (no-go gauge is too loose ) You used improper tap for material and thread application. You should use a suitable tap for hole type and material being cutted according to the table in catalogue. Cutting speed was too high. You should reduce cutting speed. You should use more coolant/lubrication. There was cold welding on the flanks of the tap. You should change your tool for new one. You should use coated tap. You should use more coolant/lubrication. You should remove damaged teeth. Chip packing in flutes occured. You should use tap with another flute geometry. There could be necessity of using set of taps Grinding burr occured. Remove it with fiber brush. Incorect fixturing or positioning of part. You should use tap holders with axial and parallel compensation. Try presicely fix cutted element. Inconsistent feed of tap. You should control the feed while tapping. You should check parameters of CNC machine (program). Check lead screw for backlash. You should use holder with compensation. Problem: Tapping oversized threads (no-go gauge is loose) The tolerance of used tap was too high comparing with required class of the thread. You should check marking on the tap and revise if it is suitable for making required class of thread. If you have any problems contact our Technical Representative. Inapropriate reconditioning of a tap. While reconditioning it is required that all ground surfaces maintain the original geometry put on by the manufacturer. For instructive information please contact our Representative. Problem: Tapping undersized threads (go gauge doesn’t enter part way into hole). The chosen tap has not suitable geometry for multiple regrinds. You should limit the number of tap regrinds. Try to use another tap. A part of tap surface wasn’t renewed while resharpening. Try to grind the tap again. You should use a new tap. You used inapropriate tap for the tread being made and material being cutted. You should use tap suitable for the hole type and material being cutted according to the table from catalogue. The used tap has too small nominal size (tolerance). You should check marking on the tap and revise if it is suitable for making required class of thread. If you have any problems contact our Technical Representative. Problem: Tapping bellmouthed hole (first few threads are oversized) The tolerance of used tap was too high comparing with required class of the thread. You should check marking on the tap and revise if it is suitable for making required class of thread. If you have any problems contact our Technical Representative. Inapropriate reconditioning of a tap. While reconditioning it is required that all ground surfaces maintain the original geometry put on by the manufacturer. For instructive information please contact our Representative. Problem: Too low tap life All reasons stated in next table "torn and rough threads”. Please read the table "torn and rough threads” The tap lost its hardness by excess hear during regrinding. You should change the specification of the grinding wheel. You should use coolant while grinding. The loss of surface treatment occured after regrinding. Retreat surface of tap. You should check suitability of surface treatment for material being tapped. Work hardened drill hole and hole chamfer. You sholud frequently change or regrind tap drill. You should check proper drilling speed and feed. Please anneal part before tapping. TECHNICAL INFORMATION 3.6.