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- Gear Teeth
- Strength of gear teeth
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STRENGTH OF GEAR TEETH 413
The following tables, Nos. 56 and 57, are calculated by
means of Mr. Lewis’ formulas and will in a great measure
facilitate the calculation of the strength of gear teeth, both in
circular and in diametral pitch.
TABLE No. 56.
Strength of Cast Iron Gears. Involute form 14£ degrees or cycloidal figur-
ed for 1 inch circular pitch and 1 inch face of tooth, according to Mr.
Wilfred Lewis’ formula.—Calculated by the author.
Speed
IOC
or
per
feet
less
min.
200 300 600 900 1200 1800 2400
H
c
CO
c
3
Ph
<u
Ph
<u
CO
1-1
O
x
a
3
PL,
%
Ph
V
CO
x
-0
3
3
O
Oh
Ph
CD
CO
X
3
3
u
V
O
Oh
"8
u
X
<a
3
3
1
Ph
CO
CO
x
CO
0
3
=s
a
u
<u
Oh
<L>
co
O
X
CO
•O
3
3
U
1
V
CO
O
X
CO
-a
c
3
u
V
*
CO
»~
X
12 536 1.62 402 2-43 322 2.92 268 4.87 20I 5.48 161 5.85 134 7.31 114 8.28
13 560 1.69 420 2-54 336 3.05 280 5-09 2IO 5-72 168 6.10 I4O 7-63 119 8.65
14 |576 1.74 432 2.62 346 3-14 288 5-23 216 5.89 173 6.28 144 7.85 122 8.90
15 600 1.81 450 2.72 36o 3-27 300 5-45 225 6.13 1 So 6.54 I50 8.18 128 9.27
16 616 1.86 462 2.80 370 3-35 308 5-6o 231 6.30 185 6.72 154 8.40 131 9-52
17 640 1-93 480 2.90 384 3-49 320 5.82 24O 6.54 192 6.98 l6o 8.72 136 9.89
18 664 2.01 498 3-OI 398 3.61 332 6.03 249 6.79 199 7-23 166 9.05JI4I
9.48 148
10.26
19 696 2.10 522 3.16 418 3-8o 348 6.32 26l 7.12! 209 7-59 174 10.76
20 7 20 2.18 54° 3-27 432 3-92 360 6-54 270 7.36 216 7-85 l8o 9.81 153 11. 13
21 736 2.23 552 3-34 442 4.01 368 6.69 276 7-52 221 8.03 I84 10.03 156 n-37
23 752 2.27 564 3-4i 451 4.10 376 6.83 282 7.71 226 8.20 188 10.25 160 11.62
25 776 2.35 582 3-52 466 4-23 388 7.05 291 7-93 ^33 8.47 194 10.58 165 11.90
27 800 2.42|600 3-63 480 4-36 4OO 7.27 300 8.18 240 8.72 200 10.90 170 12.36
30 816 2.47,612 3- 70 490 4-45 408 7.41 306 8-34 245 8.90 204 II. 13 173 12.61
34 832 2.52 624 3-78 499 4-53 416 7.56 312 8.51 250 9.08 208 H-34 177 12.86
38 856 2.59 642 3-89 514 4.67 428 7.78 321 8.75 257 9-34 214 11.67 182 13-23
43 88o 2.66 660 4.00 528 4.80 44O 8.00 330 9.00 264 9.60 220 12.00 187 13.60
SO 896 2.71 672 4.07 538 4.88 448 8.14 336 9.16 269 9.77 224 12.21 190 13-85
60 912 2:76 684 4.14 547 4-97 456 8.29 342 9-33 274 9-95 228 12.43 194 14.04
75 928 2.81 696 4.21 557 5-o6 464 8-43 348 9.49 278 10.12 232 12.63 197 14-34
100 944 2.86 708 4.29 566 5.14 472 8.58 354 9-65 2S3 10.29 236 12.82 201 14.58
150 960 2.90 720 4-36j 576 5-23 480 8.72’ 360 9.81 28S 10.47 24O 13.09 204 14.83
300 976 2-95 732 4-44 585 5.32 488 8.87 366 9.98 293 10.65 244 I3-30 207 15-08
Rack 992 3.00 744 4- 50! 595 5-4i| 496 9.02] 372 10.14 298 10.82 248 I3-5I 211 15-33
For cut Steel Gears multiply these values by 2J
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