Page 166 - Demo

164 ISCAR PRE-THREAD DRILLING WITH CHAMFERING Explanation of Pre-Threading Drills Description Example:DCNT 085 - 026 - 12 A - M101 2 3 4 5 61 Designation of Drill DCNT%u2014 SUMO-CHAM pre-thread drill with spiral flutes DCT %u2014 CHAM-DRILL pre-thread drill with straight flutes2 Minimum Pre-Thread Hole Diameter (DCN)DCN 3 Step Diameter Length (SDL)SDL4 Connection Diameter Machine Side (DCONMS)DCONMS5 Shank TypeA%u2014 with flange, one flat shankB%u2014 without flange, one flat shank6 Adaptation for Thread SizeBasic Dimensions of Pre-Threading DrillsDCTDCONMSLSOALLPRLUSD_2SDL DCN-DCXPL DC_2 STA_2DCNTLTA LSSDLSD_2LUDCONMSOALDCN-DCX PL DC_2 STA_2DCN %u2014 minimum cutting diameterDCN %u2014 maximum cutting diameterDC_2 %u2014 counter bore cutting diameterDCONMS %u2014 connection diameter machine sideSDL %u2014 step diameter lengthLS %u2014 shank lengthLPR %u2014 protruding lengthOAL %u2014 overall lengthSTA_2 %u2014 step included angleSD_2 %u2014 step distancePL %u2014 point lengthFTDZ %u2014 adaptation for thread size