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Gun Mounts
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Firing  Circuits
Figure 6-10.–Gun-positioning equipment. Base  Ring The base ring is also called the lower carriage. It is the rotating platform, supported by the stand, and supports  the  upper  carriage. Gun Carriage and Trunnion Bearing The gun carriage is also called the upper carriage. It is a massive pair of brackets that holds the trunnion bearings. The trunnion bearings support the trunnions, which are part of the slide; together they form the elevation  pivot  point. Slide The slide is a rectangular weldment that supports all of the elevating parts of the gun. FIRING   EQUIPMENT Firing equipment includes all the components necessary to allow the gun to safely fire, absorb the shock of recoil, and reposition for further firing. This includes the housing, breechblock, recoil, counter-recoil systems,  firing  circuits,  and  firing  cutouts. Figure  6-11.–The  sliding-wedge  breechblock. Housing The housing is a large steel casement in which the barrel and breechblock are fitted. The housing moves in recoil inside the slide. Breechblock The breechblock seals the breech end of the barrel. The  sliding-wedge-type  breechblock  (fig.  6-11)  consists of a machined steel plug that slides in a grooved way in the housing to cover the breech opening. The grooves are  slanted  so  that  the  breechblock  moves  forward  as  it covers the back of the casing, edging it in place. All guns currently  use  the  sliding-wedge-type  breechblock. Recoil  System Normally, a recoil system (fig. 6-12) consists of two stationary  pistons  attached  to  the  slide,  set  in  a liquid-filled cylinder in the housing. As the housing moves rearward in recoil, the trapped liquid is forced around the piston head through metered orifices, slowing  the  movement  of  the  housing. Counterrecoil   System A counterrecoil system consists of a piston (or pistons) set in a pressurized cylinder. As the gun recoils, the piston protrudes further into the cylinder. After the force of recoil is spent, the air pressure, acting against the piston, pushes the housing back into the battery (the full forward position). The piston may be attached to the slide, allowing the cylinder (which is machined into the housing) to slide over it during recoil (fig. 6-13). Later guns use two free-floating pistons set in an air chamber mounted to the inside of the slide (fig. 6-14). Air pressure 6-16

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