Общий каталог Yamawa 2021 - страница 705

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20. Troubleshooting Intro Troubles Over-cutting of internal thread SP Check pointSegments Prevent unevenin feed of tapPrevent over cuttingon threadPrevent welding Check cutting condition Prevent unbalanceon entering SL Hardness 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. Jigs, Holders ∙ Use floating type ∙ Provent centering-offholder.with work piece. ∙ Use floating type LONG holder. 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. DIES Tap Design ∙ Adjust chamfer relief ∙ Provide short thread ∙ Reconsider number of ∙ Reconsider length ofangle.length.flutes to tap.cutting chamfer. ∙ Check the width of thread margin. CENTER DRILLS Regrind ∙ Remove burrs on teethafter re-grinding.∙ Provide proper land.∙ Provide precisere-sharpening.∙ Avoid vibration. Technical info 706