Full resolution (JPEG) - On this page / på denna sida - Shafting - Classification of shafting - Horse-power transmitted by shafting
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
SHAFTING. 3<>5
Classification of Shafting.
Shafting may be divided into three different kinds.
First.— Shafts where the main belts are transmitting the
power, or so-called " Jack Shafts." Such shafts must have their
boxes as near the pulleys as possible. For torsional strength
their diameter may be calculated by the formula,
3
D — ^ / H X 125
u ~ y (See Table No. 40.)
Second.— Common shafting in shops and factories, where
the power is taken off at different places for driving machinery.
Such shafts ought to be supported by hangers as given in
Table No. 43, and their supports must also be reinforced by
extra hangers, if necessary, where an extraordinary large pulley
or heavy belt is carried. For torsional strength the diameter of
such shafts may be calculated by the formula,
3
D =
V~
7~-9
-
(
(See Table No. 41.)
Third.— Shafting having practically no transverse stress,
but used simply to transmit power from one place to another.
Such shafts ought to be supported by hangers according to
Table No. 43, and the diameter may be calculated by the
formula,
3
p = J H X 50
(See Table No. 42.)
TABLE No. 40.—Giving Horse=Power of Main Shafting
at Various Speeds.
c« a
Revolutions per Minute.
60
2.6
80
3.4
100 125 150 175 200 225 250 275 300
1% 4.3 5.4 6.4 7.5 8.6 9.7 10.7 11.8 12.9
•)
3.8 5.1 6.4 8 9.6 11.2 12.8 14.4 16 17.6 19
2X 5.4 7.3 9.1 11 13 16 18 21 23 25 27
2^ 7.5 10 12.5 15 18 22 25 28 31 34 37
2K 10 13 16 21 25 29 33 37 42 46 50
3 13 17 21 27 32 38 43 49 54 59 65
3X 16 22 27 34 41 48 55 62 69 76 82
3^ 20 27 34 43 51 60 68 77 86 94 103
S% 25 34 42 53 63 74 84 95 105 116 126
4 30 41 51 64 .77 90 102 115 128 141 154
4^ 43 58 73 91 109 128 146 164 182 201 219
5 60 80 100 125 150 175 200 225 250 275 300
<< prev. page << föreg. sida << >> nästa sida >> next page >>
