. Metal spinning . Fig. 22. Various Steps in Spinning the Two Brass Shells at the Right large end, while the lower one is 7^4 inches long by 3% inches indiameter. It was necessary to anneal these shells between eachoperation, the upper shell being annealed four times and the lowerone three times. These pieces were made in quantities sufficient to war-rant the making of chucks for each operation, which enabled them tobe spun with less skill than would be required if a finishing chuck. Fig. 23. Another Brass Spinning Operation ; the Chuck used is shown at A only were made. When a single finishin
. Metal spinning . Fig. 22. Various Steps in Spinning the Two Brass Shells at the Right large end, while the lower one is 7^4 inches long by 3% inches indiameter. It was necessary to anneal these shells between eachoperation, the upper shell being annealed four times and the lowerone three times. These pieces were made in quantities sufficient to war-rant the making of chucks for each operation, which enabled them tobe spun with less skill than would be required if a finishing chuck. Fig. 23. Another Brass Spinning Operation ; the Chuck used is shown at A only were made. When a single finishing chuck is used, the variousoperations in spinning a shell of this kind would be left to the judg-ment of the spinner, who would decide the limit of the stretch ofmetal between the operations before annealing. A brass shell that is made in five operations and with four anneal-ings is shown in Fig. 23. The finishing chuck used is a split or keychuck on which it is necessary to cut out the end of the shell in order 22 No. 57—METAL SPINNING to withdraw the key after the shell is spun. This shell, which isshown finished to the right, is 5^ inches long. It is spun smooth ona machine steel chuck, and is not skimmed, but gone over with aplanishing tool at the last operation. The two pieces shown in were also finished in this way.
Size: 2332px × 1071px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidmetalspinnin, bookyear1912
