Page 706 - Yamawa_European_Catalogue_YEU21

20. Troubleshooting

Intro

Troubles Breakage Excessive wear
SP Check point
Prevent excessive
cutting torque Prevent clogging of chips Tap Workpiece Tap
Segments
∙ Use workpiece which ∙ Use workpiece which
Hardness has regular structure has regular structure
SL and hardness. and hardness.

∙ Pay attention to
∙ Pay attention to tapping position and material
Shape tapping position and
thickness.
material thickness.
PO
∙ Provide bigger bored
Workpiece
∙ Provide bigger bored holes.
holes. ∙ Provide countersinking
∙ Prevent work on hole entrance.
hardening. ∙ Prevent work
ST Bored hole hardening
∙ Provide deeper bored
hole.
∙ Prevent slanting of
hole.
ROLL
∙ Avoid inconsistent
Machine feed.
∙ Adjust feed stroke
CARBIDE
∙ Use holder fl oating
type.
Jigs, Holders
∙ Use tap holder with
torque limiter.
LONG
Cutting condition ∙ Reduce cutting speed ∙ Reduce cutting speed

HAND ∙ Provide proper timing for changing or fi lling-up of
cutting oil.
TAPS ∙ Use cutting oil which ∙ Prevent mixing of diff erent type of oil.
Lubricant prevents cold welding. ∙ Use cutting oil which prevents cold welding.
∙ Use cutting oil. ∙ Use cutting oil.
∙ Adjust fl ow of cutting oil and method of
lubrication.
EG (STI)
∙ Remove unnecessary
chips during tapping.
On process
∙ Provide bigger space
for chips disposal.
SPECIAL
THREADS,
GAUGES ∙ Use PO tap (through
hole).
Selection
∙ Use SP tap (blind hole).
∙ Use roll tap.
THREAD
MILLS
∙ Use serial set tap.
∙ Change material of
∙ Provide bigger taps. ∙ Change material of
taps.
chiproom. ∙ Provide proper ∙ Provide proper
DIES Tap Design hardness on taps. hardness on taps.
∙ Reconsider length of cutting chamfer. ∙ Reconsider length of cutting chamfer.
∙ Use set tap. ∙ Provide nitride on taps.
CENTER
DRILLS
∙ Be careful about burning during re-sharpening. ∙ Be careful about burning during re-sharpening.
Regrind
∙ Provide proper land. ∙ Increase re-sharpening frequency.
Technical
info

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