1426 CONTACT INFORMATION For more information please call +1 330 928 7744 or send an email to ataorders@atatools.com 1. Center punch with annular cutters For annular cutters with a diameter of 12-15 mm it is absolutely necessary to set a strong center mark. See that the tip of the ejector pin is set exactly in the middle of the center mark. Highly recommendable also with all other diameters. The same applies for the Power Max carbide tipped hole saws with usage as annular cutters with ejector pins. The spindle tolerances of the machine must be in good condition for annular cutters / T.C.T. hole saws diameter 12-15 mm (do not use old, worn out machines for these diameter). 2. Speeds for annular cutters/hole saws With HSS annular cutters 12-15 the minimum speed is 450 rev/min. For carbide annular cutters a minimum speed of 600 rev/min is optimal. In case this is not possible, it is recommended to work with half the feed (feeds and speeds see pages 1427-1429 / 1434). 3. Feed Slowly and cautiously drill 1 mm deep. Then proceed with normal feed (feeds see page 1429). This procedure is absolutely necessary for diameters of 12-15 mm. Highly recommendable with all other diameters. Please heed this procedure. It significantly extends the drill's durability. 4. Drilling It may be necessary to ventilate the drill depending on the chip flow. This especially applies for cutting depths of approx. 25 mm. In case you feel a higher resistance or in case of clattering please immediately proceed as follows: a. Exit the borehole while drill is turning. b. Free drill and borehole from chips (e. g. with Karnasch pressure bottle art. 20 1308/20 1327 on page 470). c. Fill borehole with cooling and lubricating emulsion (see Karnasch cutting oils from page 1233). d. I nsert the drill into the borehole while drill is turning. During the entire process, the position of the machine or the workpiece must not be changed. So do not switch off e.g. the magnet of the core drilling machine. e. This procedure has to be repeated according to the chip flow and drilling depth. 5. Cooling Use only heavy-duty cutting oils (Karnasch cutting oils see from page 1233). We recommend continuous cooling during the entire drilling process. Use tool holders with internal cooling only for dia. 35 mm and more. (Tool holders see pages 463-465). APPLICATION GUIDELINES FOR ALL ANNULAR CUTTER CARBIDE-TIPPED, POWDER STEEL, HSS-XE STEEL 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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