Technical Description of productsInformation 25. Trouble Shooting Troubles Over-cutting of internal thread Check point Segments Prevent uneven in Prevent overfeed of tapcutting on threadPrevent welding Check cutting condition Prevent unbalanceon 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 oating ◎Prevent vibrating of axis of tap. Jigs, Holders type. ○Prevent centering-o withwork piece. ●Use tap holder of oating 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 utes 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. Re-grind ●Provide proper land. ◎ : Most suitable solution ○ : Second most suitable solution Technical-85