Общий каталог Yamawa 2021 - страница 705

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20. Troubleshooting Intro Troubles Over-cutting of internal thread SP Check point Prevent uneven Prevent over cutting Prevent unbalance Prevent welding Check cutting condition in feed of tap on thread on entering Segments Hardness SL Shape PO Workpiece ∙ Provide bigger bored ∙ Provent slanting of ∙ Provide countersinking holes. hole. on the hole entrance. ST Bored hole ROLL ∙ Adjust the feed. Machine ∙ Feed according to pitch. CARBIDE ∙ Prevent vibration of tap. ∙ Use floating type ∙ Provent centering-off Jigs, Holders holder. with work piece. ∙ Use floating type holder. LONG Cutting condition ∙ Reduce cutting speed. HAND TAPS ∙ Use lubricant which Lubricant prevents cold welding. ∙ Check the viscosity. EG (STI) On process SPECIAL THREADS, GAUGES ∙ Provide oxide surface Selection treatment. ∙ Use tap with oil hole. THREAD MILLS ∙ Provide small cutting angle. ∙ Adjust chamfer relief ∙ Provide short thread ∙ Reconsider number of ∙ Reconsider length of Design DIES Tap angle. length. flutes to tap. cutting chamfer. ∙ Check the width of thread margin. CENTER DRILLS ∙ Remove burrs on teeth ∙ Provide precise Regrind after re-grinding. ∙ Avoid vibration. re-sharpening. ∙ Provide proper land. Technical info 706