Technical Information Troubleshooting Partial List of Solutions to Tapping Problems application symptom common cause remedy gage out of limits tap size and gage mismatch select tap size for gage oversize thread alignment, spindle feed correct oversize at top runout or alignment correct go gage binds part way worn tool, tap cuts off lead replace tap, synchronous holder general thread shaving feed error, high axial force programme, synchronous holder chipping high cutting force, worn tap tap geometry, replace tap breakage chip jamming flutes tap geometry, tapping depth — worn tool, high torque replace tap with new tool short life, low speed excessive wear SC or HSS-E-PM HP taps birdnest blind hole long, ductile chips GT30 GP6505 (oxide), peck feed steel chipping high material hardness GT00, GT02 WP31MG (TiN) breakage in blind holes hole depth >2D, chip jamming GT04 WH36MG (TiN/MoS2) oversize thread, low life galling GT20, GT30 GM6515 (TiN-CrC/C) stainless steel short life work hardened core hole replace drill cast iron excessive wear abrasion GT40 GP6520 (TiCN) aluminium, cast excessive wear high silicon GT40 GP6520 (TiCN) aluminium, wrought oversize thread galling GT70, GT80 WN48EG (DLC) nickel, cobalt alloys short life high cutting temperature GT10, GT12 WS32MG (TiCN) titanium short life high cutting temperature GT14, GT16 WN35MG (TiN-DLC) Y106 widia.com Technical Information