Общий каталог OSG 2018 - 2019 - страница 683

Troubleshooting Guide PROBLEM CAUSE SOLUTION Premature Tap Wear Inappropriate spindle speed Reduce spindle speed Possible work hardening of pre-drilled hole Prevent work hardening of pre-drilled hole Inappropriate thread relief Use proper thread relief Inappropriate chamfer length Adjust chamfer length Change coolant method Inappropriate lubrication Increase volume / concentration Apply surface coating / treatment Welding / Galling Inappropriate spindle speed Reduce spindle speed Change coolant method Inappropriate lubrication Increase volume / concentration Apply surface coating / treatment Deformed Lobes Possible work hardening of pre-drilled hole Prevent work hardening of pre-drilled hole Inappropriate spindle speed Reduce spindle speed Inappropriate pre-drill size Increase pre-drill hole size as much as possible Change coolant method Inappropriate lubrication Increase volume / concentration Apply surface coating / treatment Tap substrate not suitable for material Improve wear resistance of tap Tap Breakage Possible chip packing Avoid chip packing Inappropriate pre-drill size Increase pre-drill hole size as much as possible Inappropriate spindle speed Reduce spindle speed Possible runout or tapered hole Reduce runout and assure hole is straight Too high of torque generated Use tap holder with torque adjustment / limiting feature Possible tap collision with bottom of hole Avoid hitting the bottom of the hole, check strokelength, alignment and hole size Overcutting / Oversized Threads Use compensating tension / compression tapholder Inconsistent feed of spiral fluted style tap Adjust feed rate appropriately Check CNC program Use compensating tension / compression tap holder Inconsistent feed of spiral pointed style tap Adjust feed rate appropriately Check CNC program Tearing on Flanks Inappropriate thread relief / rake angle Use sharper / freer cutting relief and angle Change coolant method Inappropriate lubrication Increase volume / concentration Apply surface coating / treatment Extremely Torn Threads Possible welding / galling Select appropriate cutting conditions Possible chip packing Select appropriate cutting conditions Inappropriate thread relief Use sharper thread relief Change coolant method Inappropriate lubrication Increase volume / concentration Apply surface coating / treatment Chips Remain at Bottom Reduce chamfer relief angle Use thinner land width Inappropriate geometry of tap Reduce chamfer length Reduce cutting angle WWW.OSGTOOL.COM Threading Technical 683