Farrow's military encyclopedia : a dictionary of military knowledge . r-ies for rifling gun-barrels with a uniform twist, fromone turn in 30 inches to one in 36 inches. The cut-ter-rod carries from one to three cutters, as the ri-fling is four, five, or six to the circumference. Anadjustable feed-stop gauges the depth of the rifling,and the racks, which are of steel, are double, to takeup all back-lash, so that the cutters cannot ride onthe lauds. An oil-pump feeds automatically ateach end of the stroke. The carriage is gibbed onthe outside of the long slide, allowing freeaccess toits working
Farrow's military encyclopedia : a dictionary of military knowledge . r-ies for rifling gun-barrels with a uniform twist, fromone turn in 30 inches to one in 36 inches. The cut-ter-rod carries from one to three cutters, as the ri-fling is four, five, or six to the circumference. Anadjustable feed-stop gauges the depth of the rifling,and the racks, which are of steel, are double, to takeup all back-lash, so that the cutters cannot ride onthe lauds. An oil-pump feeds automatically ateach end of the stroke. The carriage is gibbed onthe outside of the long slide, allowing freeaccess toits working parts. Weight, 1,600 pounds. Thismachine rities by the filing process, which is morecorrect than the planing process, and will turn outabout one gun-barrel an hour. See Orooves, Sys-tem I if Ritiilin. I RIGHT SHOULDER ARMS.—A position in the Manual ! of Arms, executed as follows : Being at a carry, theInstructor commands: \. Right shemlder, 2. the piece vertically with the right hand : grasp I it with the left at the lower band, and raise this hand. Although the rifling bar is fixed to the saddle andmoves with it, it can revolve independently of it;and toward the end farthest from the gun isfixed apinion which gears into a rack sliding in the saddleat right angles to the l)ar itself. The outer end ofthis rack is fitted with two small rollers or frictionwheels which run along a copying bar fixed to oneside of the rifling machine. This copying bar is in-clined at accrl;iin ;uiglc lo the side of the machine,and the greater tliis ;inglc, the more the rack is pull-ed out by the friction rollers, and the greater thetwist given to tlie rilling bar and so to the groovesin the gun. The angle can be altered if reiiuired :and we can also takeaway the straight copying liiirand use a curved one, as is done when a gun is to lierilled witli increasing twist. By thus changing thecojiying bars, or their jiositiou, we can use -a singlemachine for any descriplion of rillinu. The
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Keywords: ., bookcentury1800, bookdecade188, booksubjectmilitaryartandscience
