Appleton's dictionary of machines, mechanics, engine-work, and engineering . he lift is not more than 20 inches ; and the stroke is slower, being from75 to 80 per minute. In the forges of both countries, the finishing-hammers are tilted, both for convenience of access andspeed. These are of different sizes, according to the work to be done and the quality of the iron. Thelarger ones weigh from 200 to 300 lbs., and make from 120 to 150 strokes per minute, with a fall of18 or 20 inches; the smaller range from 60 to 100 lbs. in weight, and make from 250 to 300 strokes ina minute, with a fall of n
Appleton's dictionary of machines, mechanics, engine-work, and engineering . he lift is not more than 20 inches ; and the stroke is slower, being from75 to 80 per minute. In the forges of both countries, the finishing-hammers are tilted, both for convenience of access andspeed. These are of different sizes, according to the work to be done and the quality of the iron. Thelarger ones weigh from 200 to 300 lbs., and make from 120 to 150 strokes per minute, with a fall of18 or 20 inches; the smaller range from 60 to 100 lbs. in weight, and make from 250 to 300 strokes ina minute, with a fall of not more than 12 inches. To get up this speed, the water-wheel is furnishedwith more cams, sometimes as many as 32 in number. All, the largest and smallest, work against a6ort of wooden spring, which checks their upward motion and imparts more momentum to the down-ward fall. Fig. 2404 is a projection, upon a scale of one-thirtieth, parallel to the plane of the water-wheel, ofone of the modern German hammers, in an iron frame. The faces of the head and anvil are, in this, a. uniform plane ; but often, and especially for finishing hammers, the face is like the letter T in relief,or else a full cross. This modification is borrowed from the English fashion, whose hammers, besides, are altogether morepowerful and substantial. Made of iron throughout, the hammer-head and helve weigh from 4 to 7tons. The lift is effected to a height of about 15 inches, by cams, which sei«e a projecting lip in ad-vance of the very head, and constitute a trip-h&mvaer proper ; sometimes by an eccentric, which worksagainst the helve between the head and the centre of motion. The number of strokes is about 80 or 90per minute. The power is taken off from a steam-engine, and a heavy fly-wheel is necessary to equal-ize the motion. The anvil weighs ordinarily from 4 to 5 tons. Fig. 2405 is a sketch of one of these
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
