Общий каталог Yamawa 2022 - 2023

25. Trouble Shooting 25. Trouble Shooting

Troubles Check point				Over-cutting of internal thread		l
Segments		Prevent uneven in feed of tap	Prevent over cutting on thread	Prevent welding	Check cutting condition	Prevent unbaance on entering
H	ardness	●Pay attention to unevenness, and variation ofmaterials.
	Shape
Workpiece Bo	red hole			●Provide bigger bored hole.	●Prevent slanting of hole.	●Provide countersinking on the hole entrance.
Machine		●Adjust a feed. ◎Feed according to pitch.
Jigs, Holde	rs				○Use tap holder of floating type.	◎Prevent vibrating of axis of tap. ○Prevent centering-off with work piece. ●Use tap holder of floating type.
Cutting cond	ition			●Reduce cutting speed.
Lubricant On proces	s			●Use other cutting lubricant which prevents cold welding. ●Check the viscosity.
S	election			◎Provide oxide surface treatment. ◯Use tap with oil hole.
Tap	Design		◯Provide small cutting angle. ●Adjust chamfer relief angle. ◎Check the width of thread margin.	●Provide short thread length.	●Reconsider number of flutes of tap.	●Reconsider length of cutting chamfer.
R	e-grind		●Remove burrs on teeth after re-grinding. ●Provide proper land.		●Provide precise re-sharpening.	◎Care for vibration.

◯Pay attention to tapping ●If possible, use finer pitch tap or shorter tapping length. position and material thick-

●Prevent work hardening. ◎Provide deeper tapping hole (Blind hole).

●Provide countersinking on hole the entrance.

●Remove unnecessary chips ●Remove unnecessary chips during tapping. during tapping. ●Provide bigger space for chip disposal.

●Use Roll tap. ●Use Roll tap.

●Reconsider length of cutting chamfer. ●Use set tap(Serial or conventional). ●Adjust relief angle on cutting chamfer.

●Provide smaller cutting angle. ●Provide proper hardness.

●Provide shorter thread length to tap.

◎ : Most suitable solution ○ : Second most suitable solution