Machinery's Handbook, 31st Edition
MILLING SPEED ADJUSTMENT FACTORS Table 15e. Tool Life Adjustment Factors for Face Milling, End Milling, Drilling, and Reaming
1127
Face Milling with Carbides and Mixed Ceramics
End Milling with Carbides and HSS
Twist Drilling and Reaming with HSS
Tool Life, T (minutes)
f m
f l
f s
f m
f l
f s
f m
f l
f s
15 45 90
1.69 1.78 1.87 1.10 1.23 1.35 1.11 1.21 1.30 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.72 0.70 0.67 0.94 0.89 0.83 0.93 0.89 0.85
180 0.51 0.48 0.45 0.69 0.69 0.69 0.87 0.80 0.72 The speeds and feeds given in Table 11 through Table 14 and Table 17 through Table 23 (except for HSS speeds in the first speed column) are based on a 45-minute tool life. To adjust the given speeds to obtain another tool life, multiply the adjusted cutting speed for the 45-minute tool life V 45 by the tool life factor from this table according to the following rules: for small feeds, where feed ≤ 1 ∕ 2 f opt , the cutting speed for the desired tool life T is V T = f s 3 V 15 ; for medium feeds, where 1 ∕ 2 f opt < feed < 3 ∕ 4 f opt , V T = f m 3 V 15 ; and for larger feeds, where 3 ∕ 4 f opt ≤ feed ≤ f opt , V T = f l 3 V 15 . Here, f opt is the largest ( optimum ) feed of the two feed/speed values given in the speed tables or the maximum feed f max obtained from Table 15c, if that table was used in calculating speed adjustment factors. Table 16. Cutting Tool Grade Descriptions and Common Vendor Equivalents
Approximate Vendor Equivalents
Tool Identification Code
Grade Description
Sandvik Coromant
Kennametal
Seco
Valenite
Cubic boron nitride
1 2 3
CB50 CC620 CC650 CC680 CC690 CT515 CT525 CD10
KD050 K060 K090
CBN20 VC721
Ceramics
480 480
—
Q32
4 (Whiskers) CC670
KYON2500 — —
5 (Sialon)
KYON2000 480
—
6 7 8 9
KYON3000 — Q6
Cermets
KT125 KT150 KD100
CM VC605 CR VC610 PAX20 VC727 — — TP100 SV310 TP300 SV235 TP200 SV325 TP100 SV315
Polycrystalline Coated carbides
10 11 12 13 14 15 16 17 18 19 20
GC-A — GC3015 KC910
GC235
KC9045
GC4025 KC9025
GC415
KC950
Uncoated carbides
H13A K8, K4H 883
VC2
S10T S1P S30T
K420, K28 CP20 VC7
K45
CP20 VC7 CP25 VC5
—
S6
K21, K25 CP50 VC56
SM30 CP25 VC35M See Table 2 on page 866 and the section Cemented Carbides and Other Hard Materials for more detailed information on cutting tool grades. The identification codes in column two correspond to the grade numbers given in the footnotes to Table 1 to Table 4b, Table 6 to Table 14, and Table 17 to Table 23. KC710
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