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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Do you lap the whole ring or just bottom half only
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<blockquote data-quote="ntsqd" data-source="post: 2389572" data-attributes="member: 93138"><p>This can't be said enough it seems. Somehow "CNC machined" has come to mean that anything made that way will be prefect. Nothing could be farther from the truth, but Marketing triumphs over reality once again. For those that insist on CNC'd rings not needing to be lapped, you need to know that CNC machines do not move in circles. They move in straight lines and a "circle" to them is a sequence of many short, straight lines. The results look round to the naked eye, but it is pretty much impossible to make something that is actually round that way. When you lap something made this way you will see the high and low areas.</p><p></p><p>Lapp with the tops on the rings. You aren't just getting the rings into perfect alignment, you're also making sure that the ring bores are perfectly round.</p><p></p><p>I lightly lap every ring set as that is how I determine just how well aligned they actually are. This is a fitting process very similar to using machinist's dykem to find the high and low points between fitted parts. The lapping bar is a proxy for how the rings will fit the scope and lightly lapping the rings show where the rings will and won't make contact with the scope.</p><p></p><p></p><p>Poorly.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2389572, member: 93138"] This can't be said enough it seems. Somehow "CNC machined" has come to mean that anything made that way will be prefect. Nothing could be farther from the truth, but Marketing triumphs over reality once again. For those that insist on CNC'd rings not needing to be lapped, you need to know that CNC machines do not move in circles. They move in straight lines and a "circle" to them is a sequence of many short, straight lines. The results look round to the naked eye, but it is pretty much impossible to make something that is actually round that way. When you lap something made this way you will see the high and low areas. Lapp with the tops on the rings. You aren't just getting the rings into perfect alignment, you're also making sure that the ring bores are perfectly round. I lightly lap every ring set as that is how I determine just how well aligned they actually are. This is a fitting process very similar to using machinist's dykem to find the high and low points between fitted parts. The lapping bar is a proxy for how the rings will fit the scope and lightly lapping the rings show where the rings will and won't make contact with the scope. Poorly. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Do you lap the whole ring or just bottom half only
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