Общий каталог Yamawa 2022 - 2023 - страница 952

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Spiral Fluted Taps (for blind hole)Spiral Fluted Taps(for through hole)Spiral Pointed Taps(for through hole)Hand TapsCementedCarbide TapsRoll TapsSpecial Thread TapsSimple Inspection ToolsPipe TapsThread MillsPremium Thread MillsDiesCenter DrillsCentering Tools ⑪ Center Drills / Centering Tools Dia. Shank Overall Flutedia.lengthlengthDcDsLℓ JIS ① NC-SD V NC-SD NC Starting Drills for Chamfering (90°), Coated NC Starting Drills for Center Positioning (125°) ② Specification Specification Coating ③ Product Features Product Features After drilling with a general purpose drill, using a NC - SD V (90°) The NC starting drill with a 125°drill point is a positioning drill ④ that is larger than the drilled hole diameter makes an excellent dedicated to centering to increase hole positioning accuracy. chamfer surface finish. The NC starting drill with a 125°drill is selected to be slightly larger than the tip angle of the general-purpose drill. This creates a highly accurate hole positioning without causing chipping on the cutting edge of the drill. ⑤ Universal Drill NC-SD V 90° NC-SD 125° Universal Drill Processing completed Processing completed ⑥ ⑦ Difference between starting drill and center hole drill ⑧ It is also possible to use a center hole drill for positioning. If the center hole drill isused first and is allowed to go too deep, there is a chance the general purpose drill will hit the hole diameter instead of the center of the hole location. This can cause the drills cutting edge to chip. ⑨ Recommended cutting conditions.  Unit：min-1 Workpiece Cutting Speed Diameter (mm） Material （m/min） φ3 φ4 φ5 φ6 φ8 φ 10 φ 12 φ 16 φ 20 φ 25 ⑩ SS400 25 ～ 40 3400 2600 2100 1700 1300 1050 850 640 510 410S50C25 ～ 3230002300180015001150900750560450360 FC250 20 ～ 35 2900 2200 1750 1450 1100 860 720 540 430 350 SCM440 15 ～ 25 2200 1600 1300 1100 800 640 540 400 320 260 SUS304 7 ～ 12 1100 800 640 540 400 320 270 200 160 130 SKD61 8 ～ 15 1200 880 700 590 440 360 300 220 180 150 SKD11 7 ～ 12 1100 800 640 540 400 320 270 200 160 130 AC4C 60 ～ 90 8000 6000 4800 4000 3000 2400 2000 1500 1200 1000 ⑪ * S tandard feed rates (mm / rev) should be 1% to 3% of the drill diameter. In the case of machining on a curved surface or an inclined surface, please set a consistent feed rate of 0.1 mm / rev. JIS ⑪-53