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<blockquote data-quote="SidecarFlip" data-source="post: 607780" data-attributes="member: 39764"><p>I agree, in essence. Lack of proper lubrication of sliding surfaces accelerates wear.....</p><p> </p><p>There are torsional forces at work in a reloading press but the prime wear point is the bearing surface between the base casting and the ram and proper lubrication of the point will reduce sliding wear and mitigate torsional wear (if present) as well.</p><p> </p><p>It's the responsibility of the frame casting to maintain squareness, that's why it's ribbed and usually massive.... and I'm reasonably sure when the press frame is machined, the bore in the top of the frame casting and the base are line bored, then the top is threaded, most likely on one CNC machine in multiple operations. It's as square and parallel as the machine's inherent tolerances can make it.</p><p> </p><p>As far as thread mated components are concerned the laterial movement directly relates to the major and minor root diameter of the thread, the style of thread, the pitch and the fit attained. That's called lash and can be eliminated entirely through the use of take up locking collars (you'll find them on all reloading dies by the way).... all about travel screws on machine tools, most of which are square shouldered threads...</p><p> </p><p>Large Presses (something I work with everyday) have bronze wear plates on the sliding surfaces that are adjustable for wear and large presses are usually pressure or flood lubricated or both and lubricated with an extreme pressure lubricant similat to way oil. It's a boundary lubricant, that is, it provides an oil film between the metal sliding surfaces and that's exactly what occurs on the ram of a press that's properly lubricated.</p><p> </p><p>It's all about lubrication of sliding surfaces.....</p><p> </p><p>It also directly relates to resizing brass......lightbulb</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 607780, member: 39764"] I agree, in essence. Lack of proper lubrication of sliding surfaces accelerates wear..... There are torsional forces at work in a reloading press but the prime wear point is the bearing surface between the base casting and the ram and proper lubrication of the point will reduce sliding wear and mitigate torsional wear (if present) as well. It's the responsibility of the frame casting to maintain squareness, that's why it's ribbed and usually massive.... and I'm reasonably sure when the press frame is machined, the bore in the top of the frame casting and the base are line bored, then the top is threaded, most likely on one CNC machine in multiple operations. It's as square and parallel as the machine's inherent tolerances can make it. As far as thread mated components are concerned the laterial movement directly relates to the major and minor root diameter of the thread, the style of thread, the pitch and the fit attained. That's called lash and can be eliminated entirely through the use of take up locking collars (you'll find them on all reloading dies by the way).... all about travel screws on machine tools, most of which are square shouldered threads... Large Presses (something I work with everyday) have bronze wear plates on the sliding surfaces that are adjustable for wear and large presses are usually pressure or flood lubricated or both and lubricated with an extreme pressure lubricant similat to way oil. It's a boundary lubricant, that is, it provides an oil film between the metal sliding surfaces and that's exactly what occurs on the ram of a press that's properly lubricated. It's all about lubrication of sliding surfaces..... It also directly relates to resizing brass......lightbulb [/QUOTE]
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