bon with folded edges is then transferredto a high speed punch in which the holes for the tubesare pierced and the ribbon cut off in 1-in. lengths, whichform the individual fins. The metal in the holes is notcut away but is bent up to form a good surface for solder-ing to the tube. As each fin is… … Fig. 3—The punch here shown pierces the holes in the finstheir front edge, cuts the fins off to length and inserts themshoiiH at the right This automatic punching machine is capable of load-ing from thirty-six to forty jigs per hour. The machineis shown in Fig. 3. The unloaded jig is placed in…
Automobiles · Aeronautics
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