Общий каталог OSG 2018 - 2019 - страница 682

Troubleshooting Guide PROBLEM CAUSE SOLUTION Chip Packing Inappropriate spindle speed Adjust RPM (lower or higher) for proper chip form (Back Threaded Portion) Helix angle too large Decrease helix angle orchoose tap with low helix angle Chips not coiling / breaking properly Use alternate coating Chip Packing *Occurs predominantly in horizontal applications* (Single Thread) Weak rake angle (positive) Decrease rake angle Chips not evacuating properly Use a POT style tap or a LHH / RHF Chips not coiling / breaking properly Use alternate coating Chipping During Reversal Improve wear resistance of tap Chips left behind in flute during tap reversal Improve / add surface treatment / coating Material shrinkage Increase coolant volume /concentration to control heat Chipping Due to Wear Improve wear resistance of tap Tap substrate not suitable for work material Improve / add surface treatment / coating Cutting action work hardened material Shorten chamfer length Chipping of Land Edge Occurs when tap either hits bottom Avoid hitting the bottom of the hole, check or entrance of hole stroke length, alignment and hole size Chipping of Land Axially Occurs when tap either hits bottom Avoid hitting the bottom of the hole, check or entrance of hole stroke length, alignment and hole size Chipping of Chamfer Tap substrate not suitable for work material Improve wear resistance of tap Inappropriate pre-drill size Select suitable pre-drill size 682 Threading Technical WWW.OSGTOOL.COM