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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why dial a rifle bore within .0001"
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<blockquote data-quote="SidecarFlip" data-source="post: 1141633" data-attributes="member: 39764"><p>As a machine shop owner and Journeyman tool and die maker, I own numerous lathes, both manual and CNC and for practical purposes, no lathe with the exception of a second operation toolroom lathe, is capable of holding 1 ten thousandths of an inch.</p><p></p><p>It's impossible simply because the TIR of the spindle precludes that. The only way a spindle (the headstock end( can hold 0.0001 is if the bearings are Class 5 and 99% of machines sold for general use, aren't. Secondly, 1 tenth is entirely dependent on factors such as temperature of the workpiece and tool deflection.</p><p></p><p>Anyone who claims they are holding 1 tenth accuracy in a shop enviroment without very special considerations is simply FOS.</p><p></p><p>Besides, most laymen can't measure 1/10th accurately anyway, tailstock alignment or not, floating reamer or not. Not gonna happen.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 1141633, member: 39764"] As a machine shop owner and Journeyman tool and die maker, I own numerous lathes, both manual and CNC and for practical purposes, no lathe with the exception of a second operation toolroom lathe, is capable of holding 1 ten thousandths of an inch. It's impossible simply because the TIR of the spindle precludes that. The only way a spindle (the headstock end( can hold 0.0001 is if the bearings are Class 5 and 99% of machines sold for general use, aren't. Secondly, 1 tenth is entirely dependent on factors such as temperature of the workpiece and tool deflection. Anyone who claims they are holding 1 tenth accuracy in a shop enviroment without very special considerations is simply FOS. Besides, most laymen can't measure 1/10th accurately anyway, tailstock alignment or not, floating reamer or not. Not gonna happen. [/QUOTE]
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Why dial a rifle bore within .0001"
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