American Agriculturist, November 17,1923 
339 
Figuring the Size of Pulleys 
1 have an eight horsepower engine with a 
speed of 335 revolutions per minute. The 
pulley of the engine is 22 inches in diameter. 
The pulley on my threshing machine is six 
inches in diameter. The threshing machine 
should have a speed of 1,050 revolutions per 
minute. I want to run the thresher from a 
line shaft. yNow what size pulleys would I 
need on the line shaft to give me that speed? 
I also have a pulley five inches in diameter 
for same threshing machine. If I use the 
5-inch pulley, what size pulley on the engine 
would I need then ? 
I also have a feed cutter with a 13-inch 
pulley and it runs about right when run di¬ 
rect from the engine. However, I want to 
run it from the line shaft also. What size 
pulleys will I need to keep it at about the 
same speed? — H v S., Pennsylvania. 
U NLESS it is absolutely unavoid- 
able a farm line shaft should not 
be" run faster than 250 revolutions per 
minute. To obtain this speed for the 
shaft, using your engine which has a 
22-inch pulley and runs at 335 revolu¬ 
tions per minute, it would require on 
the shaft a 29-inch pulley. There is a 
very simple rule to follow in finding 
the size of the pulley to be used. Multi¬ 
ply the two things or quantities _ you 
know about one pulley together. Divide 
by what you know of the other or sec¬ 
ond pulley and you will find out the 
other factors or what you desire to 
know about this second pulley. 
In your case you know the size and 
speed of the engine pulley. Therefore 
multiply these two quantities together 
(335 x 22 equals 7,370). Assume a 
speed for the line shaft pulley of 250 
revolutions per minute. What you 
want to know is how large this pulley 
must be. Therefore, you divide 7,370 
by 250 and get 29.5. Therefore, either 
a 29 or a 30-inch pulley must be used, 
preferably a 29-inch pulley as this is 
a driven pulley. 
Same Rule for Other Problems 
All of your other problems may be 
solved by using the same rule. Take 
your thresher, for example. It is to 
run at 1,050 revolutions per minute. 
You have a 5-inch pulley for it. The 
line shaft turns at 250 revolutions per 
minute. Multiply the two things you 
know or the two quantities of the 
thresher pulley (1,050 x 5 equals 5,250). 
Divide this by what you know about 
the line shaft pulley, namely its speed 
of 250 revolutions per minute. The re- 
sult will be the necessary size of the 
pulley for the line shaft (5,250 divided 
by 250) or 21 inches. Figuring simi¬ 
larly, for a pulley to drive your feed 
grinder from the line shaft, the latter 
turning at 250 revolutions per minute, 
it develops that you would require a 
30-inch pulley. 
I would suggest that you put a smal¬ 
ler pulley on your engine, for by do¬ 
ing so you could use smaller pulleys on 
the line shaft. Using a 12-inch pulley 
on the engine would make it possible 
to use a 16-inch pulley on the line shaft 
for the belt from the engine and another 
16-inch pulley on the line shaft for the 
belt to the feed grinder. If you use 
the 5-inch pulley on the thresher, a 
21-inch pulley would be required on the 
line shaft to drive the thresher. If 
you were to use a 4-inch pulley on the 
thresher a 17-inch pulley would be large 
enough for a line shaft pulley to drive 
the thresher.—F. H. B. 
GAS ENGINE DUTY 
Will you kindly toll mo if a gasoline engine 
doing light work, on a line shaft can charge 
a set of batteries at the same time? Would it 
take any more power? Would it be satis¬ 
factory as a honn> plant for lighting with 
electricity and perhaps some light work? — 
A. H. H., New York. 
The ability of a gas engine to charge 
a battery simultaneously with the ac¬ 
complishment of other work will de¬ 
pend upon the power required to op¬ 
erate the electric generator and the 
power of the engine. The rate of 
charging of the battery will depend en¬ 
tirely upon the size of the generator. 
A generator of small power require¬ 
ments can probably be hooked up with 
a gas engine without any very ap¬ 
preciable increase in the load on the 
gas engine. If the gas engine has a 
little reserve power, it will handle the 
job without any particular trouble. 
Naturally, it will require some more 
power, since it takes power to generate 
electricity. A lighting plant made up 
of separate units, including separately 
mounted gas engine and generator is 
entirely practical. The current can be 
taken directly from the generator for 
lighting and small power purposes. 
VJK 
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