. Automotive industries . sees that the scale has been removed from the heads-and bevel seats so that there is no danger of tool damagefrom this source. The first machine manufacturing operation on the valveis that of forming the head. This is done on a turretlathe with a compound tool. The operation is shown inFig. 6. The machine is an ordinary Fuller turret lathe,the interesting feature being the cutter, which works ona cross-feed. This tool cuts the outside diameter of thevalve, forms the seats and forms the underside of thevalve to proper radii. The operation is located from thevalve stem
. Automotive industries . sees that the scale has been removed from the heads-and bevel seats so that there is no danger of tool damagefrom this source. The first machine manufacturing operation on the valveis that of forming the head. This is done on a turretlathe with a compound tool. The operation is shown inFig. 6. The machine is an ordinary Fuller turret lathe,the interesting feature being the cutter, which works ona cross-feed. This tool cuts the outside diameter of thevalve, forms the seats and forms the underside of thevalve to proper radii. The operation is located from thevalve stem diameter, which is held in an ordinary the head is formed in this rough forming opera-tion, the heads are given center marks for locating thefinish grinding and machining work on the stems. Thecentering operation, which is shown in Fig. 7, is done ona special machine, the stem being clamped in a V-blockwhich serves as a locating means. When so clamped the June 23, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 1383. 1—Cutting off stock to length e In. longer than finished valve stem. Stock is .010 in. diameter larger than finishedstem. 2—Drilling the cast Iron valve heads on a special machine which drills six at a time. 3—Cleaning out counter-sinks In the valve head casting. 4—Welding valve stems to valve head. The stem projects within the countersunk portionof the head and after welding, the projecting piece of stem and the flux when fused fill the entire countersunk —Rough grinding the valve head to take off the hard scale after welding. 6—First machine operation which forms thehead and seats of valve. 7—Operation for establishing center of valve head, locating from diameter of valve stem by means of at A. 1384 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE June 23, 1921
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
