Table 20. Speeds and Feeds for Drilling, Reaming, and Threading Ferrous Cast Metals Table 20. (Continued) Speeds and Feeds for Drilling, Reaming, and Threading Ferrous Cast Metals
Drilling Reaming
Drilling
Reaming
Threading
Indexable Carbide Insert
HSS
HSS
Uncoated
Coated
HSS
HSS
Brinell Hardness Number 270-330 330-400 190-225 225-260 240-300 100-150 125-175 175-225 225-300 150-200 200-250 250-300 175-225 225-250 250-300 300-350 350-400
f = feed (0.001 in/rev), s = speed (ft/min) Metric Units: f 3 25.4 = mm/rev, s 3 0.3048 = m/min Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg.
Speed (fpm)
Material
25 10 70 50 40
15
(Martensitic): 120-90-02
{
5
45 30 25 65 60 45 35 50 40 30 45 35 30 20
(Ferritic-Pearlitic): 80-55-06
f s
13 60
6 60
11 70
6 150
11 195
6 405
21 55
11 40
83 60
20 55
(Pearlitic-Martensitic): 100-70-03
Cast Steels
18 35
9 70
29 75
15 85
83 65
20 85
f s
(Low carbon): 1010, 1020
100
90 70 55 75 65 50 70 60 45 30
(Medium carbon): 1030, 1040, 1050
{
f s
4 475
24 65
12 70
83 55
20 70
15 35
7 60
8 195 †
(Low-carbon alloy): 1320, 2315, 2320, 4110, 4120, 4320, 8020, 8620
{
f s
8 130 †
4 315
(Medium-carbon alloy): 1330, 1340, 2325, 2330, 4125, 4130, 4140, 4330, 4340, 8030, 80B30, 8040, 8430, 8440, 8630, 8640, 9525, 9530, 9535 {
20 10 See the footnote to Table 17 for instructions concerning the use of this table. The combined feed/speed data in this table are based on tool grades (identified in Table 16) as follows: uncoated = 15; coated carbide = 11, † = 10.
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