. Canadian forest industries 1886-1888. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA LUMBERMAN. WE not of P( A STANDARD GANG SAW MILL. ated in our last issue that the Wm. Hamilton Mfg. Co. I'eterborougji, Out., had just made arrangements with Wm. M. Wilkin, of Erie, Pa., to manufacture his improved patent Compensating Balance Gang, and now give description and cut which very clearly shows its general construction and operation. The radical departure in this machine from pre- vious practice consists in the device adopted for preventing
. Canadian forest industries 1886-1888. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA LUMBERMAN. WE not of P( A STANDARD GANG SAW MILL. ated in our last issue that the Wm. Hamilton Mfg. Co. I'eterborougji, Out., had just made arrangements with Wm. M. Wilkin, of Erie, Pa., to manufacture his improved patent Compensating Balance Gang, and now give description and cut which very clearly shows its general construction and operation. The radical departure in this machine from pre- vious practice consists in the device adopted for preventing the excessive vibrations to which the ordinary gang mill has Been subject. The immense weight of a heavy sash full of saws, re- ciprocating at the rate of 200 to 300 strokes a minute required an absolutely stable foundation ; and even then many gangs tore themselves to pieces. The shaft of the compensating gang here illustrated is pro- vided with three cranks, the centre one operating the main pitman and the sash. - The other two carry inverted pitmans attached to a counterweight sliding in vertical ways. The counterweight is exactly equal to the sash and its saws. The three cranks have the same throw, the two inverted pitmans are of the same weight as the driving pitman, and as the motions of the sash and the counterweight are in exactly oppo- site directions, it will be seen that the reciprocating parts are self-balanced, the opposing shocks and vibrations will thorough- ly neutralize each other, and the machine will run at any speed without jar. Such are, in brief, the claims of its makers. Moreover, it Will be seen that the vertical throw of the mechanism being absorbed within itself, the journal boxes are required to bear only the uniform weight of the sash, rods and counterweight. The sash is made of orie casting of steel, and is oscillated by long inverted pendulums pivoted at the bottom, and oscillated near the top b| means of an eccentric rod and rock-shaft, so timed w
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectforestsandforestry
