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4 i4 STRENGTH OF GEAR TEETH
TABLE No. 57.
Strength of Cast Iron Gears. Involute form 14£ degrees or cycloidal figured
for "one diametral pitch" and 1 inch face of tooth, according to
Mr. Wilfred Lewis’ formula.—Calculated by the author.
Speed
100 feet
or less
per min.
200 300 600 900 1200 1 3oo 2400
o
o
h
o
6
03
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3
3
5
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<u
en
O
•a
1
u
O
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03
u
K
f
3
IOII
u
ss
<u
to
u
X
9.2
03
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1
842
u
u
15.3
03
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3
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a.
u
V
03
u
K
17.2
03
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3
3
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505
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03
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u
O
03
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3
3
C
P4
u
12 1684 5-1 1263 7.6 631 18.3 421 22.9 358 26.0
13 1759 5-3 1319 7-9 1056 9.6 880 16.0 660 18.0 528 19.2 440 24.O 374 27.2
14 1810 5-5 1357 8.2 1086 9.8 905 16.4 679 18.5 543 19-7 452 24.6 385 28.0
15 1885 5-7 1414 8-5 1131 10.2 942 17.1 707 19.2 565 20.5 471 25.6 401 29.1
16 1935 5-8 1451 8.8 1161 10.5 968 17.6 726 19.8 580 21.0 484 26.4 4ii 29.8
17 2010 6.0 1508 9-i 1206 10.9 1005 18.2 754 20.5 603 21.9 503 27.4 427 31.0
18 2086 6-3 1565 9-4 1252 H-3 1043 18.9 782 21.3 626 22.7 522 28.4 443 32.2
19 2187 6.6 1640 9-9 1312 11.9 1093 19.8 820 22.3 656 23-8 547 29.8 465 33-7
20 2262 6.8 1696 10.2 1357 12.3 1131 20.5 848 23.1 679 24.6 565 30.8481 34-9
21 2312 7.o 1734 10.5 1387 12.6 1156 21.0 867 23.6 694 25.2 578 3i-5 491 35-7
23 2362 7-i 1772 10.7 1417 12.8 1181 21.5 886 24.2 709 25.7 591 32.2 502 36.5
25 2437 7-3 1828 11.0 1463 13.3 1218 22.1 914 24.9 73i 26.5 609 33-2518 37-4
27 2513 7-6 1885 11.4 1508 13-7 1256 22.8 942 25-7 754 27.4 628 34-3 534 38.8
30 2564 7-7 1923 11.6 1538 13.9 1282 23-3 961 26.2 769 27.9 64I 34-9545 39-6
34 2617 7-9 i960 11.9 1568 14.2 1307 23-7 980 26.7 784 28.5 653 35-6 555 40.3
33 2689 8.1 2017 12.2 1614 14.6 1344 24.4 1008 27.4 S07 29-3 672 36.6 57i 41-5
43 2765 8-3 2073 12.5 1659 15-0 1382 25.1 1037 28.2 829 30.1 69I 37.6587 42.7
50 2815 8-5 2111 12.8 1689 15-3
1407J
25.5 1056 2S.S S44 30.7 704 38.4 !
598 43-4
60 2865 8.6 2149 i3-o 1718 15-6 1433 26.0 1074 29.3 860 31.2 716 39.0609 44-3
75 2915 8.8 2187 13-2 1749 15-9 1458 26.5 1093 29.8 S75 31-8 729 39-7 6I9 45-0
100 2966 8.9 2224 13.4 1779 16.
1
1483 26.9 1112 30.3 890 32.3 741 40.4630 45-8
150 3016 9.1 2262 13-7 1810 16.4 1508 27.4 1131 30.8 90 5 32.9 754 41. 1 641 46.5
300 3066 9.2 2300 13-9 1838 16.7 1533 27-8 1150 31-3 920 33-4 767 41.8 656 47-4
Rack 3116 9.4 2373 1 4.1] 1870 17.0 1553 28. 3 I
1 169 31.8 935 34-oi 776J 42.41622 48.1
For cut Steel Gears multiply these values by 2\
Example i. What is the safe working strength of a cast iron
gear having 100 teeth, 4 diametral pitch.running 300 revolutions
per minute and matching a machinery steel pinion of 25 teeth,
the width of the face being 2I inches.
Solution: The speed of the gear is:
100 „ r
3.1416 X 300 X I2 x
= 1964 feet per minute.
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