Каталог Iscar высокоточные развертки и метчики 2022 - страница 67

TAPS USER GUIDE General Recommendations (Regrinding) 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 Taps used on cast iron can rarely be resharpened, as it is very abrasive and tends to wear the flank in such a way that it becomes grossly out of tolerance. Chamfer out Taps for Aluminun of center 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 its specifications. Controls (tests) Once the tap is resharpened, it is always best to test it to correctly obtain the same Picture 7 threads as when the tap was new. a • The chamfer must be perfectly on axis in order to avoid the effects of picture 6. 3 The cutters must have correct divisions. b • The results of resharpening with an incorrect division is shown in picture 7. • 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 377