Page 9 - bpk_brill
P. 9
RECOMMENDED CUTTING DATA (CC DRILL)
Decide S(R.P.M) and F(feed); CC 드릴 (CENTER & CHAMFER DRILL)
Inch inch α= Point angle 90°, 120°and 142°
R.P.M
D=2×H×tan(α/2) ipm(inches per minute) H = Centering Depth
S=3.82×(Vc/D) D = Effective Diameter
F=n×f×Ff Vc = Cutting Speed
Metric mm m/min. or ft./min.
R.P.M S = Spindle Speed
D=2×H×tan(α/2) mm/min F = Feed Rate
S=3.82×(Vc×1000/D×π) f = Feed Per Rev.
F=n×f×Ff
mm/rev.
inch/rev.
Ff = Feed Rate Factor
**Max. H Centering=7mm(0.28″)
Grooving=5mm(0.20″)
Chamfering=7mm(0.28″)
Centering and Grooving Chamfering
11
ReCoMMenDeD CuttInG DAtA FoR MAteRIAlS
WORKPIECE CUTTING SPEED FEED PER REV.
CARBON STEEL 탄소강 m/min ft/min mm/rev. inch/rev.
ALLOy STEEL 합금강
HIGH ALLOy STEEL 고합금강 120~150 400~500 0.05 0.002
HARD STEEL < HRC40° 저경도강 0.04 0.0015
HARD STEEL, 40°< HRC < 48° 고경도강 100~120 330~400 0.03 0.001
STAINLESS STEEL 스텐레스강 60~80 200~260 0.03 0.001
GRAy CASTING IRON 회주철 60~80 200~260 0.03 0.001
0.03 0.001
50~60 165~200 0.05 0.002
50~60 165~200
80~102 260~332
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