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Rifles, Reloading, Optics, Equipment
Gunsmithing
secrets of straightening a barrel
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<blockquote data-quote="Trickymissfit" data-source="post: 511374" data-attributes="member: 25383"><p>There's a gauging company (name escapes me at the moment). They sell this machine that is pretty much a custom built one for each application. You simply lay the shaft in two vee blacks that are roughly 20% in from each end. There are two tail stock affairs that use a special centering device on each end. They sorta grab the part and rotate it two or three turns in clockwise and counter clockwise directions (the reverse rotation is key). While the shaft is being rotated a vertical probe comes in and checks for runout, and locates the highest points. It then sets the shaft back down in the vee blocks (these are not conventional as they have radiused surfaces contacting the parts). The secound head will then come in and apply pressure where it's needed to make the part strait (uses a ball screw with an encoder and a device to actually measure applied pressure). It rarely has to check the part three times, and will usually be in the five tenths range when it releases it. The machine is programed to toss out parts that are warped too much (around .025"), and parts that will not straiten after five attempts. We had them big enough to do 4340 shafts 1.5" in diameter over 40" long. But most were in the 20" to 24" range.</p><p> </p><p>Most people don't realize that you can have a piece of steel perfectly strait, but when you start cutting metal it will go all over the place. EDM is not so bad, but a mill or lathe operation will change it. Nature of the beast!</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 511374, member: 25383"] There's a gauging company (name escapes me at the moment). They sell this machine that is pretty much a custom built one for each application. You simply lay the shaft in two vee blacks that are roughly 20% in from each end. There are two tail stock affairs that use a special centering device on each end. They sorta grab the part and rotate it two or three turns in clockwise and counter clockwise directions (the reverse rotation is key). While the shaft is being rotated a vertical probe comes in and checks for runout, and locates the highest points. It then sets the shaft back down in the vee blocks (these are not conventional as they have radiused surfaces contacting the parts). The secound head will then come in and apply pressure where it's needed to make the part strait (uses a ball screw with an encoder and a device to actually measure applied pressure). It rarely has to check the part three times, and will usually be in the five tenths range when it releases it. The machine is programed to toss out parts that are warped too much (around .025"), and parts that will not straiten after five attempts. We had them big enough to do 4340 shafts 1.5" in diameter over 40" long. But most were in the 20" to 24" range. Most people don't realize that you can have a piece of steel perfectly strait, but when you start cutting metal it will go all over the place. EDM is not so bad, but a mill or lathe operation will change it. Nature of the beast! gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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secrets of straightening a barrel
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