Общий каталог Yamawa 2022 - 2023 - страница 952

⑪ Center Drills / Centering Tools Dia. Dc Shank dia. Ds Overall length L Flute length ℓ JIS NC-SD V NC-SD Spiral Fluted Taps (for blind hole) ① NC Starting Drills for Chamfering (90° ), Coated NC Starting Drills for Center Positioning (125° ) Spiral Fluted Taps (for through hole) ② Specification Specification Coating Spiral Pointed Taps (for through hole) 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 Hand Taps 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. Cemented Carbide Taps ⑤ Universal Drill NC-SD V 90° NC-SD 125° Universal Drill Processing completed Processing completed Roll Taps ⑥ Special Thread Taps Simple Inspection Tools ⑦ Difference between starting drill and center hole drill Pipe Taps It is also possible to use a center hole drill for positioning. If the center hole drill is ⑧ used 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. Thread Mills Premium Thread Mills 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 Dies 25 ～ 40 ⑩ SS400 3400 2600 2100 1700 1300 1050 850 640 510 410 S50C 25 ～ 32 3000 2300 1800 1500 1150 900 750 560 450 360 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 Center Drills Centering Tools 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