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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel Blank Curve
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<blockquote data-quote="jarnold37" data-source="post: 2567291" data-attributes="member: 29241"><p>Just wondering. When chambering between centers, and the 60° center is removed, how can you keep the barrel dialed in with a steady rest. I have tried roller bearings and bushings with steady rest and the indicator will sometimes show as much as 20 thousands runout. My expensive high quality lathe had the tailstock 2.7 thousands high when new.. Even truing tail left and right could not make up for the high up and down. So I had my tailstock ground to 9 tenths high. Started chambering in headstock with quality 6 jaw chuck. But with long cartridges there is some runout in the tailstock quill in its entire stroke. And it seems the chamber end being indicated is more critical than the muzzle end in outboard of spindle because the bore is not straight. It seems that the 6 inches of the chamber end indicated to 1 or 2 tenths will ensure that the chamber is concentric with the bore where the reamer is cutting and the muzzle need not dialed in per se. Between centers the muzzle bore is centered but the important end is off in the steady rest and the tailstock is also off. I am not arguing, just questioning.</p></blockquote><p></p>
[QUOTE="jarnold37, post: 2567291, member: 29241"] Just wondering. When chambering between centers, and the 60° center is removed, how can you keep the barrel dialed in with a steady rest. I have tried roller bearings and bushings with steady rest and the indicator will sometimes show as much as 20 thousands runout. My expensive high quality lathe had the tailstock 2.7 thousands high when new.. Even truing tail left and right could not make up for the high up and down. So I had my tailstock ground to 9 tenths high. Started chambering in headstock with quality 6 jaw chuck. But with long cartridges there is some runout in the tailstock quill in its entire stroke. And it seems the chamber end being indicated is more critical than the muzzle end in outboard of spindle because the bore is not straight. It seems that the 6 inches of the chamber end indicated to 1 or 2 tenths will ensure that the chamber is concentric with the bore where the reamer is cutting and the muzzle need not dialed in per se. Between centers the muzzle bore is centered but the important end is off in the steady rest and the tailstock is also off. I am not arguing, just questioning. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel Blank Curve
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