Gun Barrel Drilling Machine
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Gun Barrel Drilling Machine

Gun Barrel Drilling Machine




      

Gun Barrel Drilling Machine


Gun Barrel Drilling Machine

In the manufacture of rifle barrels the finest machinery is now used. The advent of the barrel-drilling machine has affected the manufacture of the smaller caliber rifle barrels to a greater extent than any other invention of the past fifty years. The operator can, without any particular effort of mechanical skill, drill a continuous hole through solid stock, with little deviation from a straight central bore of uniform size, if conditions are what they should be.

No particular apparatus is required for starting the drill; neither is any straightening required during the operation, and little or none until after the proof reaming.

The machine is double and has a horizontal bed. The heads are at the end and have mounted in them independent spindles parallel to each other. On their inner ends are chucks for securing and rotating the barrels in the adjustable rests which support, guide and control the starting of the drills, which are secured in the sliding carriages. These are fed positively 38 inches by a screw having automatic stops. The screw has a variety of speeds through change gearing, to compensate for different qualities of stock to be drilled.

Two rotary pumps (one for each barrel) force oil, supplied from a tank placed underneath the machine, through a series of tubes into and through the drill. The oil lubricates the cutting lip, and forces out the chips into the basin on top of the tank, where they are drained, and the strained oil returned to the pump again.

Farrow, Edward S. American Small Arms; a Veritable Encyclopedia of Knowledge for Sportsmen and Military Men. New York: Bradford, 1904. Print.

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