. Bulletin - United States National Museum. Science. Jin- ii Details 01 rw phreading lathi seen in the right foreground of figure g showing the method of drive and support foi the work From J / , vol. g, plate i. dl work. This can be realized from figure 16 which shows .1 traverse-spindle lathe headstock typical oi the mid-19th century. During the years intervening be- tween the machines of figures 12 and 16, the gem raJ design was greatly improved b) removing the lead screws from the centei of the spindle. This made pos- sible a shorter, much stiffer spindle and supported both ol the spindle
. Bulletin - United States National Museum. Science. Jin- ii Details 01 rw phreading lathi seen in the right foreground of figure g showing the method of drive and support foi the work From J / , vol. g, plate i. dl work. This can be realized from figure 16 which shows .1 traverse-spindle lathe headstock typical oi the mid-19th century. During the years intervening be- tween the machines of figures 12 and 16, the gem raJ design was greatly improved b) removing the lead screws from the centei of the spindle. This made pos- sible a shorter, much stiffer spindle and supported both ol the spindle in one frame or headstock rather than in separate pieces attached to the bed. The screws were now mounted outside oi the spindle- bearings, one .it .i time, while the mating nuts were cut into the circumference ol a disk which could lie turned to bring an) particular nut into working position as required. With this arrangement, a wide variety of leads either right or left hand could be pro- sided and additional leads could he lilted at an\ hum e time. Screw-cutting lathes of this design were popu- lar foi a \ei\ long time with instrument makeis .md opticians who had little need to cut screws of great length. The demands of expanding iiidiisti\ lor greater versatility in the production of engineering elements late in the Kith century set the stage for the evolution of more complex machines tending to place the threaded spindle lathes in eclipse. Maudslay's lathe of 17'J7 Willi) ill-. 13) appeared at this time when industry was receptive to rapid innovation. Un- fortunately, the gearing which once existed to connect the headstock spindle with the lead screw has long been lost. At this time it is quite difficult to say with certainty whether the original gear set offered a \ ai i CI tTTNG HY THE MASTER-SCREW Ml HUH) 113. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
Size: 2486px × 1005px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
