Общий каталог Yamawa 2022 - 2023 - страница 1236

25. Trouble Shooting Description of products Troubles Over-cutting of internal thread Check point Prevent uneven in Prevent over Prevent welding Check cutting condition Prevent unbalance Segments feed of tap cutting on thread on entering ●Pay attention to unevenness, and variation of materials. Hardness Shape Workpiece ●Provide bigger bored hole. ●Prevent slanting of hole. ●Provide countersinking on the hole entrance. Bored hole ●Adjust a feed. Machine ◎Feed according to pitch. ○Use tap holder of floating ◎Prevent vibrating of axis of tap. type. ○Prevent centering-off with Jigs, Holders work piece. ●Use tap holder of floating type. ●Reduce cutting speed. Cutting condition ●Use other cutting lubricant which prevents cold welding. ●Check the viscosity. Lubricant On process ◎Provide oxide surface treatment. Selection ◯Use tap with oil hole. ◯Provide small cutting angle. ●Provide short thread length. ●Reconsider number of ●Reconsider length of cutting flutes of tap. chamfer. ●Adjust chamfer relief angle. Tap Design ◎Check the width of thread margin. ●Remove burrs on teeth after ●Provide precise re-sharpening. ◎Care for vibration. re-grinding. Information Re-grind Technical ●Provide proper land. ◎ : Most suitable solution ○ : Second most suitable solution Technical-85