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1891 article - The Thurston & Schott Milling Machine |
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1891-07-16 The Iron Age |
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8/26/2018 10:57:37 AM |
The Thurston & Schott Milling Machine.
The Thurston Mfg. Company of Providence, R. I., are building a machine especially for manufacturers of silver ware, jewelry, fire arms or any business requiring blanking or trimming dies. The principal features of the construction of the machine will be understood from the engraving, in which it is seen that the frame proper is supported upon gudgeons at either side, which are clam ed in their bearings, and serve to hold 1 e frame in any desired position for the convenience of the operator.
Through the right-hand gudgeon passes the shaft on which is laced the driving pulley; at the other end of this shaft is n bevel gear, which by means of another bevel gear, drives the spindle.
This spindle is vertical and has a vertical adjustment. It carries at the upper end the mill by which the cutting is done; this mill being of the ordinary stem cutter type, with taper shank, and with the cutting portion also tapered to suit the amount of clearance desired in the die.
This cutter projects through an opening in the bottom of the chuck, over which opening the work is placed. The chuck is moved in either direction by means of the two slides and screws at right angles to each other, and thus by means of the crank handles the lines laid out on the surface of the work can be accurately followed. It is necessary only to drill one hole through the portion of the die which is to be removed, and the cutter started in at this hole, removes the entire center in a single piece, as shown in the engraving, where the bowl of a large spoon die has been cut out and placed on top of the die when the machine was photographed. The pointer seen at the right always remains in a fixed position with regard to the cutter, so that where for any reason the cutter is below the surface of the work and therefore out of sight, the pointer indicates its exact position. This is found to be especially convenient in cases where a sharp corner is to be made in a die, when the cutter can be lowered a little and the cutting continued, guided by the pointer, thus leaving but Very little to be flied out. The machine is so designed and fitted up that the movement of the slides is smooth and under control, special provision being made for taking up all lost motion. Two sizes are built, the smaller of which will hold a plate 6 inches wide, ? thick and any length; the larger machine, 10 inches wide, 2½ inches thick, and any length. |
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