Каталог Iscar вращающийся инструмент 2017 - страница 737

USER GUIDE General Recommendations (Regrinding) TAPS Maintenance Picture 6 It is important to periodically regrind the worn tap. This is to avoid permanent damage or even tool breakage. The Grinding Wheels The structure and grain of grinding wheels must be appropriate for the tap to be resharpened. Taps for Cast Iron Chamfer out Taps used on cast iron can rarely be resharpened, as of center it is very abrasive and tends to wear the flank in such a manner that it becomes grossly out of tolerance. Taps for Aluminun After regrinding it is advisable to remove the steel burrs with a wire brush. Tap Inspection It is important to inspect the tap after regrinding to ensure that all of the dimensions and angles have remained according to the specifications. Controls (tests) Once the tap is resharpened, it is always best to test it to correctly obtain the same threads as when the tap was new. • The chamfer must be perfectly on axis Picture 7 in order to avoid the effects of picture 6. a The cutters must have correct divisions. • The results of resharpening with an incorrect division is shown in picture 7. 3 b • The length and number of threads in chamfer must be precisely identical to those of the new tap. 2 4 1 γ Incorrect division-cutters not concentric 733 733