Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . he other wheel driven.) Example.—It is required to cut 20 threads to the inch, the pitch of the feed-screw being 2, one ofthe driving-wheels containing 40 teeth and the other 15. Pitch requiredto be cut. 20 -r- Pitch offeed-screw. Teeth in onedriving-wheel. 40 Teeth in otherdriving-wheel. 15 = 6000. Then, 6000 -4- 50 = 120; and hence one of the gears will require to contain 50 and the other 120 teeth. If we have not two of such wheels, we may divide by some other number instead of 50.
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . he other wheel driven.) Example.—It is required to cut 20 threads to the inch, the pitch of the feed-screw being 2, one ofthe driving-wheels containing 40 teeth and the other 15. Pitch requiredto be cut. 20 -r- Pitch offeed-screw. Teeth in onedriving-wheel. 40 Teeth in otherdriving-wheel. 15 = 6000. Then, 6000 -4- 50 = 120; and hence one of the gears will require to contain 50 and the other 120 teeth. If we have not two of such wheels, we may divide by some other number instead of 50. Thus:6000 -f- 60 = 100; and the wheels will require to have respectively 60 and 100 teeth. If there are no wheels on the lathe, we proceed as follows : Divide the pitch required by the pitch of the feed-screw ; the quotient is the proportion betweenthe revolutions of the first driving-gear and the feed-screw gear. Example.—Required the gears ito cut a pitch of 20, the feed-screw pitch being 4. Ilere 20-4-4= 5; that is to say, the feed-screw must revolve 5 times as slowly as the first driving-gear. We. now find two numbers which, multiplied together, make 5, as 2^ x 2 = 5; hence one pair of wheelsmust be geared 2\ to 1 and the other pair 2 to 1, the small wheel of each pair being used as drivers,because the thread required is finer than the feed-screw. 240 LATHE, METAL-WORKING. ;s 2589.
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