Общий каталог Yamawa 2021 - страница 704

• Copertina
• Capitoli web
• Parte finale web

20. Troubleshooting Intro Undersize cutting of internal thread Bad surface, surface damaged SP Improve cutting performance Selection and design of tap Work material Improve cutting performance Prevent welding Check cutting condition ∙ Use workpiece which ∙ Check workmaterial. has regular structure and hardness. SL ∙ Pay attention to ∙ Pay attention to tapping position and tapping position and material thickness. material thickness. PO ∙ Adopt bigger bored hole. ∙ Prevent work hardening ST of material. ∙ Prevent work ∙ Provide bigger bored ∙ Prevent slanting of hardening. holes. hole. ROLL ∙ Feed according to pitch. ∙ Use floating type CARBIDE holder. ∙ Prevent vibration of tap. ∙ Prevent centering-off with work piece. LONG ∙ Reduce cutting speed ∙ Provide proper timing for changing or filling-up of cutting oil. HAND ∙ Prevent mixing of different type of oil. TAPS ∙ Use cutting oil which prevents cold welding. ∙ Use cutting oil. ∙ Adjust flow of cutting oil and method of lubrication. EG (STI) ∙ Remove unnecessary chips during tapping. SPECIAL THREADS, GAUGES ∙ Use spiral pointed taps ∙ Provide oxide coating ∙ Provide Nitride on taps. ∙ Use oversized taps. ∙ Use oil hole taps. (for through hole). on taps. THREAD MILLS ∙ Provide larger cutting angle. ∙ Change of no. of flutes ∙ Reconsider length of ∙ Adjust relief angle on ∙ Adjust relief angle on on taps. cutting chamfer. ∙ Provide larger cutting cutting chamfer. cutting chamfer. angle. ∙ Provide thread relief. ∙ Provide smaller margin. DIES CENTER ∙ Increase re-sharpening frequency. ∙ Provide better surface finishing on flutes. DRILLS ∙ Increase re-sharpening frequency. ∙ Provide precise re-sharpening. Technical info 705