Page 1939 - Master Catalog 2017, Inch

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 program, 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/MoS )
2
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)
aluminum, cast excessive wear high silicon GT40 GP6520 (TiCN)

aluminum, 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)

Thread Mills
Technical Information
vibration marks major crest wear edge chipping cone-shaped thread entry marks

cutting speed check reduce — — —
feed per tooth check increase reduce — —

workpiece clamping improve improve improve — improve
machine tool stability improve improve improve — improve

cantilever arm shorten shorten — — shorten
helix angle increase reduce — — —
radial runout check check — — —

coating — improve improve — —
milling operation — climb mill climb mill climb mill —

line feed/entry ramp check check — — improve
check check
coolant pressure — — —
(>20 bar, 290 psi) (>20 bar, 290 psi)

widia.com W241

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