Troubleshooting Guide
PROBLEM
CAUSE
SOLUTION
Chip Packing (Back Threaded Portion)
Inappropriate spindle speed
Adjust RPM (lower or higher) for proper chip form
Decrease helix angle or choose tap with low helix angle
Helix angle too large
Chips not coiling / breaking properly
Use alternate coating
*Occurs predominantly in horizontal applications*
Chip Packing (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
Increase coolant volume / concentration to control heat
Material shrinkage
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 or entrance of hole
Avoid hitting the bottom of the hole, check stroke length, alignment and hole size
Chipping of Land Axially
Occurs when tap either hits bottom or entrance of hole
Avoid hitting the bottom of the hole, check 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
Threading Technical
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