Page 162 - Demo

160 ISCAR PRE-THREAD DRILLING WITH CHAMFERING Assembled combined drills belonging to the Pre-Thread line exist in two variations: with straight flutes and with spiral flutes. Drill with straight flutes designated DCT %u2026 and carry interchangeable CHAM-DRILL drilling heads. Drill with spiral flutes designated DCNT %u2026 and carry interchangeable SUMO-CHAM drilling heads. Straight flute drills are designed with a central coolant channel, while spiral fluted drills are designed with spiral coolant channels.The Tables Below ProvideRecommendations for Using the Assembled Combined DrillsBelonging to the Pre-Thread Line.DCNT %u2026DCT %u2026