. American engineer and railroad journal . DIE AND FEED MECHANISM—THREAD ROLLING MACHINE. ing the elevation and section of the machine that at the rearend of the main spindle there are two spiral springs and meansfor putting them in tension. These keep the dies in the bolt enters and the rolling begins at different pointson the rotating die, the breaking down or the beginning ofthe thread is not confined to one particular place. The diesadmit of fine adjustment for the required size of work, orto compensate for wear. The adjustment for different diam-eters with threads of the same pit
. American engineer and railroad journal . DIE AND FEED MECHANISM—THREAD ROLLING MACHINE. ing the elevation and section of the machine that at the rearend of the main spindle there are two spiral springs and meansfor putting them in tension. These keep the dies in the bolt enters and the rolling begins at different pointson the rotating die, the breaking down or the beginning ofthe thread is not confined to one particular place. The diesadmit of fine adjustment for the required size of work, orto compensate for wear. The adjustment for different diam-eters with threads of the same pitch is made entirely byvarying the setting of the stationary die. For other pitchesa different set of dies may readily be substituted. Equippedwith two sets of dies, as shown, the machine can be used forrolling studbolts, forming both ends at one operation. The following results of a recent test illustrate the com-parative strength of cut and rolled threads, the material inboth cases being machine steel. A 1% by 24%-in. bolt withcut thre
Size: 1744px × 1432px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
