Общий каталог Yamawa 2021

Troubles Check point Segments	Prevent uneven in feed of tap	O Prevent over cutting on thread	ver-cutting of internal thread Prevent welding	Check cutting condition	Prevent unbalance on entering
Hardness
Shape
Workpiece Bored hole			∙ Provide bigger bored holes.	∙ Provent slanting of hole.	∙ Provide countersinking on the hole entrance.
Machine	∙ Adjust the feed. ∙ Feed according to pitch.
Jigs, Holders				∙ Use fl oating type holder.	∙ Prevent vibration of tap. ∙ Provent centering-off with work piece. ∙ Use fl oating type holder.
Cutting condition			∙ Reduce cutting speed.
Lubricant			∙ Use lubricant which prevents cold welding. ∙ Check the viscosity.
On process
Selection			∙ 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 fl utes to tap.	∙ Reconsider length of cutting chamfer.
Regrind		∙ Remove burrs on teeth after re-grinding. ∙ Provide proper land.		∙ Provide precise re-sharpening.	∙ Avoid vibration.

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