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396 RIMS, ARMS AND HUBS OF SPUR GEARS
will cause initial stress due to the unequal shrinkage when the
casting is made and also because the arms must not only be
strong enough to stand the strain they are to transmit, but
they must also be strong enough to stand the strain of turning
and cutting in the machine shop without undue chattering and
trouble
Following tables (Nos. 50 and 51) are offered only as a guide
and will often be modified by the designer. They are intended
for cast iron gears with teeth calculated according to diame-
tral pitch from 2 to 16 pitch.
TABLE No. 50. Shape of Gears
Diametral
Pitch Plain Web 6 Arms
2 pitch not exceeding 1 8 teeth froml8to36teetl1 over 36 teeth
3 " 20 ’
20"40 ’
40 ’
4 " 24
" ’
.24
4<
44
" ’
44
4
5 ’
4
28 " ’
28
4<
48 " 1
48 ’
6 " 32 " 1
32
(<
50
il
’
50 ’
8 " 40
" ’
40"56 " 1
56 ’
10 " " 45
M
45"65 " 4
65 ’
12 " 52 " 1
52
4
’70
" 4
70
4
14 " 58
4<
58"75
" 4
75 ’
16 " 64 " 64’ ’80 " 41
80 "
TABLE No. 51. Size of Arms in Small Gears.
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