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Rifles, Reloading, Optics, Equipment
Reloading
Brass Spring Back
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<blockquote data-quote="SidecarFlip" data-source="post: 887361" data-attributes="member: 39764"><p>Derek...</p><p> </p><p>It's all about repeatability and consistency. Look at it this way. You can make a part on a manual machine at the same level of accuracy and tolerances but it takes exponentially longer than using a CNC machine (so long as the CNC machine or the manual machine will hold the desired tolerance in the first place).</p><p> </p><p>It's difficult to get consistency when you introduce the human factor.</p><p> </p><p>If heat treating (which is what annealing is, that is, altering the grain structure of the brass, basically aligning the grain structure) any metal was consistent in a manual operation, commercial heat treaters would do it manually. They don't. They use digitally controlled heat sources and conveyance mechanisms to achieve consistency.</p><p> </p><p>Of course most heat treating involves controlled atmospheres as well but heat treating steel produces oxidation, much like the discoloration of the brass that we all equate to it being 'annealed'.</p><p> </p><p>A machine lie the Bench Source or the Gerauld, 'index' the case in the flame for a preset amount of time, that preset is of course a tighter tolerance than you can achieve, plus, they index the case in exactly the same position in respect to the flame every time as well. Thats consistency in annealing.</p><p> </p><p>I realize the hand method is much less expensive but you cannot obtain the consistent indexing the machines can and that is what you pay for, consistency.</p><p> </p><p>There is a fine line between 'properly annealed' and too soft. I don't want to explore the 'too soft' side of that line.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 887361, member: 39764"] Derek... It's all about repeatability and consistency. Look at it this way. You can make a part on a manual machine at the same level of accuracy and tolerances but it takes exponentially longer than using a CNC machine (so long as the CNC machine or the manual machine will hold the desired tolerance in the first place). It's difficult to get consistency when you introduce the human factor. If heat treating (which is what annealing is, that is, altering the grain structure of the brass, basically aligning the grain structure) any metal was consistent in a manual operation, commercial heat treaters would do it manually. They don't. They use digitally controlled heat sources and conveyance mechanisms to achieve consistency. Of course most heat treating involves controlled atmospheres as well but heat treating steel produces oxidation, much like the discoloration of the brass that we all equate to it being 'annealed'. A machine lie the Bench Source or the Gerauld, 'index' the case in the flame for a preset amount of time, that preset is of course a tighter tolerance than you can achieve, plus, they index the case in exactly the same position in respect to the flame every time as well. Thats consistency in annealing. I realize the hand method is much less expensive but you cannot obtain the consistent indexing the machines can and that is what you pay for, consistency. There is a fine line between 'properly annealed' and too soft. I don't want to explore the 'too soft' side of that line. [/QUOTE]
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