Scientific American Supplement, No. 401, September 8, 1883 by Various
page 42 of 136 (30%)
page 42 of 136 (30%)
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part, as in other forms of such machines heretofore in use.
The mill shown in the perspective view is one of twenty-six saws 41/2 feet long, sash 38 inches wide in the clear, and stroke 20 inches, capable of making 230 strokes per minute. The crank shaft is nine inches in diameter, of the best forged iron. The main pillow block has a base 61/2 feet long by 21 inches bearing, weighing 2,800 pounds. The cap is secured by two forged bolts 31/2 inches in diameter, and by this arrangement no unequal strain upon the cap is possible. A disk crank is used with suitable counterbalance, expressly adapted to the weight and speed of sash; a hammered steel wrist pin five inches in diameter, and a forged pitman of the most approved pattern, with best composition boxes. The iron drive pulley is 4 to 41/2 feet in diameter and 24 inches face; the fly-wheel six feet in diameter, and weighing 4,700 pounds, turned off at rim. When a wider and heavier sash is required, a proportionate increase is made in all these parts. In the construction of the sash the stiles are made of steel; the lower girt and upper heads are made in one solid piece, without rivets, giving the greatest strength possible, with the least weight. The outfit also includes eight iron rollers for the floor, 81/2 inches in diameter, with iron stands, and geared as live rolls when desired, a full set of Lippencott's steel saw hangings, and gauges for one-inch lumber. The weight of the machine here shown is 181/2 tons. They are, however, built in larger or smaller sizes, adapted to any locality, quality or quantity of work desired. * * * * * It is said that the St. Gothard Tunnel is diverting the bulk of the |
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