Alfa Main Catalogue Strana 192
Nabídka komerčních zákazníků **Nejlépe prodávané z ALFRA
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TAPPING – RECOMMENDED VALUES (TOLERANCE ACCORDING TO ISO 2 6H) RECOMMENDED VALUES FOR USE OF MACHINE TAP DRILLS WITH TAPPING ATTACHMENTS ON MAGNETIC DRILLS Tapping: The tap drill to be used must be matched to the core hole prepared in the work piece. Please refer to the enclosed borehole table for metric ISO threads. Borehole table metric ISO threads Dimensions M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 Stg. 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5 Fine thread Drill Ø 2.5 3.3 4.2 5 6.8 8.5 10.2 12 14 15.5 17.5 Dimensions M8x1 M10x1 M12x1 M12x1.5 M14x1 M14x1.5 M16x1 M16x1.5 M20x1 M20x1.5 Stg. 1 1 1 1.5 1 1.5 1 1.5 1 1.5 Drill Ø 7 9 11 10.5 13 12.5 15 14.5 19 18.5 Tips for the production of threads 1. Clearance hole We recommend adjacent tap drills for the clearance holes which convey the chips out of the borehole in the cutting direction. The special polished section also allows a reliable re-threading when the tap drill is withdrawn from the tapped hole and moves back in an anticlockwise direction. 2. Blind holes We recommend adjacent tap drills for blind holes. The chips are guided out of the borehole against the direction of the cutting. It is particularly important to ensure that the tap drill does not run aground, because otherwise the automatic return can no longer be activated. A correspondingly large pre-borehole depth must be planned. Chip ejection downward through the hole DIN 371 with a reinforced shank form B, with spiral point, 3.5 to 5 pitches DIN 376 with a reduced shaft, thread depth 3 x D Chip ejection along the tool DIN 371 with reinforced shank with a spiral groove, approx. 35° right-hand twist bevel C, approx. 3 pitches If this is not done, the tap drill must be loosened manually. 3. Blind holes up to 1.5 x D For this, our tap drills are suited to according to the adjacent figure. Also here, the chips are conveyed away out of the borehole against the cutting direction. Also here, it must be ensured that the tap drill does not run aground. A correspondingly large pre-borehole depth must be taken into account. If this is not done, the tap drill must be loosened manually. Beside our tap drills with a reinforced shank, tap drills with a reduced shaft according to DIN 376 can, of course, also be used. Please work with sufficient coolant that is recommended by the manufacturer for tapping. 192 DIN 376 with reduced shaft Thread depth 2.5 x D Chip ejection along the tool DIN 371 with reinforced shank with a spiral groove, approx. 17° right-hand twist, bevel C, approx. 2 to 3 pitches DIN 376 with reduced shaft Thread depth 1.5 x D
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