. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . enit is desired to roll a thread on, forexample, a i in. bolt, the dies are setthe proper distance apart and the op-erator takes the threadless bolt andplaces it the proper depth, determinedby a stop in the machine and waits forthe moving die to draw back to theend of its return stroke. When themoving die begins its working strokethe bolt is caught between the dies andis rolled between them, the operatorkeeping his hand loosely on the revolvinghead. Just before the end of the strokethe bolt i
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . enit is desired to roll a thread on, forexample, a i in. bolt, the dies are setthe proper distance apart and the op-erator takes the threadless bolt andplaces it the proper depth, determinedby a stop in the machine and waits forthe moving die to draw back to theend of its return stroke. When themoving die begins its working strokethe bolt is caught between the dies andis rolled between them, the operatorkeeping his hand loosely on the revolvinghead. Just before the end of the strokethe bolt is rolled out and the operatorremoving it at once prevents the possi-bility of the return stroke drawing ihebolt back into the machine. \ Moving iPle 1 MOVING DIE WITH GROOVES FORROLLING THREADS ON BOLTS The thread is, in this way. not cuton the bolt in the sense that it is cutby a tool in a lathe or by the dies of abolt threading machine. The thread isformed by the upsetting of the metaland as no stock is cut away the burr,so often left by a cutting tool, is notformed. There is, however, a certain. SCREW THREAD ROLLING MACHINE SEND FOR CATALOGUE - scends or ascends exactly half the pitchin the distance of half the circumfer-ence; therefore, the lowest point of agroove on one die is placed exactly op-posite the highest point between grooveson the other die, and the dies are spacedapart just the diameter of the bolt,measured across the base of thethreads. The stationary die is cut away thedepth of the threads at the enteringend for about one inch, so that themachine may get a grip on the bolt at amount of scale from rough stock, andfuzz from the finished stock which dropsbetween the dies, and as this wouldin time injure the lower slide, a slot ismade in the bed plate, with a stripperattached to the slide, so that at eachrevolution the scale or fuzz drops iniothe slot and is thrown out by the scraper,thus insuring a clean working surfacefor the lower surface of the slide, whichis
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