Page 180 - Demo

178 ISCAR PRE-THREAD DRILLING WITH CHAMFERING SOLID-DRILL Regrinding InstructionsThe solid carbide combined drills can be re-sharpened and re-coated at least 10 times. 45%u00b07%u00b0 spiral relief1 Primary Clearance%u03b1%u00b0 D Range7 0.8-6.010 >6.12 Secondary Clearance3 Chisel%u03b1%u00b0 D Range100 3.0-4.8105 4.9-1095 10.1-204 Edge PreparationRAAR D Range0.02 0.8-6.00.03 6.1-18.00.04 18.1>UPNotes:%u2022 Recommended for each grinding operation: rotate the drill 180%u00b0 and repeat the grinding procedure.%u2022 Grinding wheel recommended specifications:%u2022 Diameter grinding wheel: GA2.%u2022 Grinding wheel bond: Synthetic resin.%u2022 Grit size: 325/400 mesh (45/38%u03bc).%u2022 Diamond concentration: C-75 (3.3 carat/cm3).%u2022 Cutting fluid emulsion 3%.