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Title: |
1875 article on band resaw |
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Source: |
Manufacturer and builder / Volume 7, Issue 4; April 1875 |
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Insert Date: |
7/9/2003 9:45:40 PM |
Article text:
BAND-SAW FOR RE-SAWING
THE firm of First & Pryibil, of 461 to 467 West 40th street. New York, well known as the manufacturers of band-saws and other wood-working machinery, have spent several years in experiments and trials, and have at last succeeded in constructing a new and improved band-saw, especially designed for re-sawing. This machine is represented in the adjoined engraving, and has been introduced in many manufacturing establishments, where several of them are now in successful operation, giving general and full satisfaction.
The size of these machines is as follows: height, 10 feet; diameter of wrought-iron wheels, 5 feet; they rest on a planed iron bed 6 feet 2 inches long and 2 feet 9 inches wide, to be set on a strong floor, or still better on a brick foundation. The lower wheel is sunk in the floor about 2 feet 3 inches, as illustrated in our engraving. The total weight of the machine is between 4,000 and 5,000 pounds, while the price is $1,100, and with bevel attachment to saw weatherboards or ship-work, $1,200.
The best velocity for this machine is to cause the wheels to make from 360 to 400 revolutions per minute; in that case it can saw in a day of ten working hours from 12,000 to 16,000 feet of lumber; while it is able to take in lumber 18 inches thick, it has a sawing space of 30 inches. The saw kerf made is from one-sixteenth to threethirty-seconds of an inch thick.
The advantage of a thin blade, as found in these saws, is very great; first, it saves lumber, which is important, as timber is gradually becoming more costly; second, as the power required to run a saw is in direct proportion to the width of the kerf, it saves considerable power, and thus fuel. This is of more importance than is generally supposed, as with hard lumber the mere saving in the cost of the sawing, if done with these thin blades, when compared with the cost of sawing with thick blades, is more than the whole expense of the sawing with this saw amounts to.
The principal point of this machine is therefore the saving of lumber and power. In most instances by its agency it is possible to get out of 1-inch stuff two panels of 3/8 inch planed on both sides, whereas on many other machines now in use the same result can only be obtained by using 1 1/4 inch stuff, consequently this machine saves 20 per cent in lumber.
The power this machine requires is from 7 to 14 horse. The exact amount to ascertain is difficult, as some parties might use sharp and others dull saws; but at the same time the saving of power is easily illustrated by the small quantity of saw-dust produced; every pound of saw-dust may be considered as representing a certain number of foot-pounds, which however varies, according to the quality of the wood and the sharpness or dullness of the saw; but in any case one thing is certain, that machines which produce say twice the amount of saw-dust, must consume twice the amount of power for pulverizing that amount of wood. |
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