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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Difference between a savage and a tikka barrel
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<blockquote data-quote="Trickymissfit" data-source="post: 825288" data-attributes="member: 25383"><p>the coolant systems used on gun drills are pretty expensive, and the newer ones are very elaborate. Multi stage filtration systems that are often redundant. They pumps are usually supercharged hydraulic pumps that produce a lot of volume under high pressure. The older machines used a conventional acme lead screw to drive the drill slide into the part, and this alone used quite a bit of power to drive it (most Pratts use this setup). Later on they invented the balls screw, and it took a lot less power to push the drill (most used a non precision roll thread ball screw). That's about the time that the coolant systems were completely redesigned by the big names. We had several multi axis Seneca Falls gun drills that had two sets of gun drills at each end. The operator could also program a cross axis to help him get the drill holes dead center. The drills were capable of drill from each end at the same time with no step left in the middle. This seriously sped up gun drill operations. Parts were semi hard (40rc) 6xxx series steel. This was the only drill I ever saw conformed like that.</p><p> </p><p>The high pressure coolant does two basic things in a gun drill, and most people think it only is there to cool the drill bit. It's main job is to blow the chips out of the hole. The other job is to pressurize the bushing in the bushing box. Without the correct pressures the dill will not cut strait, and the finish will be ugly.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 825288, member: 25383"] the coolant systems used on gun drills are pretty expensive, and the newer ones are very elaborate. Multi stage filtration systems that are often redundant. They pumps are usually supercharged hydraulic pumps that produce a lot of volume under high pressure. The older machines used a conventional acme lead screw to drive the drill slide into the part, and this alone used quite a bit of power to drive it (most Pratts use this setup). Later on they invented the balls screw, and it took a lot less power to push the drill (most used a non precision roll thread ball screw). That's about the time that the coolant systems were completely redesigned by the big names. We had several multi axis Seneca Falls gun drills that had two sets of gun drills at each end. The operator could also program a cross axis to help him get the drill holes dead center. The drills were capable of drill from each end at the same time with no step left in the middle. This seriously sped up gun drill operations. Parts were semi hard (40rc) 6xxx series steel. This was the only drill I ever saw conformed like that. The high pressure coolant does two basic things in a gun drill, and most people think it only is there to cool the drill bit. It's main job is to blow the chips out of the hole. The other job is to pressurize the bushing in the bushing box. Without the correct pressures the dill will not cut strait, and the finish will be ugly. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Difference between a savage and a tikka barrel
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