1368 CONTACT INFORMATION For more information please call +1 330 928 7744 or send an email to ataorders@atatools.com 1 Drilling a pilot hole 2 Enter into the pilot hole 1 We recommend to use our Karnasch solid carbide high performance twist drill 22 0402 or 22 0405 in the shortest version, to place a pilot hole. 2 Please drill a precision hole between 1.5×D and 2×D, to ensure a perfect drilling process. Enter the pilot hole with low speed and without internal colling supply before 1 mm of the hole ground (max. 300 rpm and feed rate = 1000 mm/min). Blind hole drilling – Appliation instruction for Solid carbide twist drill < 40×D 3 Deep hole drilling 4 Retract the drill Drill to the required depth. Cutting data and cooling preassure see on pages 1360 + 1367 1 Retacting of the hole until the depth of the pilot hole with feed rate = 2000 mm/min. 2 Retracting from the pilot hole with low speed and without internal cooling supply (n = 300 rpm, feed rate = 2000 mm/min.). 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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