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How to Lap vertical rings?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/14/2007 at 08:13
Bear250b View Drop Down
Optics GrassHopper
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     I understand the concept and have lapped STD, and QR rings before but is there a special way I should be lapping vertcal Talley rings other then turning the gun on its side?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/14/2007 at 11:40
Dolphin View Drop Down
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I personally have mounted several hundred scopes and do not lap my rings.  I usually use Warne mounts and rings and feel the quality and the precision to which they have been manufactured does not require that it is necessary.  I have talked with the people at Warne and they agree.  Even their sponsored Benchrest shooter does not have his rings lapped.  I know how to lap rings, but just do not.  Now, there are some on this site that will disagree and I respect their opinion greatly as they are extremely knowledgable.  I would assume that the orientation of the rings would not matter when lapping, as the idea is to smooth out the entire surface of the rings to eliminate any excessive pressure that would push the scope in one direction or the other and aligning it perfectly with both rings.  See what Rifledude has to say.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/14/2007 at 13:54
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I agree with Dolphin you should not need to lap quality rings, I do place a single layer of scotch tape inside of the rings before mounting a scope. I do frequently move scopes from one gun to another at the range frequently but I have not scratched a scope yet that I know of. I have been mounting scopes this way for  for over 50 years and I have not seen a need to change.

 

Duce 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/14/2007 at 14:01
Bear250b View Drop Down
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   Thanks guys I will take this all into account.  Just was a little parinoid because this will be my first high end scope.

 

 

Thanks

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/14/2007 at 21:45
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Give the things a couple of light passes and see if the need it...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/16/2007 at 22:51
RifleDude View Drop Down
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Even the finest quality, most precision made rings don't help if the rifle's mounting holes or receiver mounting surfaces are out of alignment.  This is actually a fairly common situation.  Anytime you use a 2 piece base, your mount alignment is subject to how precise your receiver's mounting holes and the front ring and rear bridge surfaces are aligned, period.  Most of the time, you can get away from not lapping due to the fact the mounting holes and/or receiver surfaces are not so far out of alignment that the scope wouldn't correct for it.  This is why many people, including scope mount manufacturers, don't recommend lapping.  However, this doesn't mean lapping isn't necessary.  Sometimes lapping is the cure for serious receiver misalignment.  Even a few 0.001" of receiver/screw hole misalignment can cause your scope tube to be stressed and cause you to use too much of the scope's adjustments.  The slignt bending of the tube can even degrade the optical performance of the scope by causing the lenses to be out of alignment front to back.  The fact that many rifle receivers and scope base mounting holes aren't in perfect alignment is why some mounts like the Burris Signature have the inserts that act like gymbals, correcting for misalignment in the rifle/mount system.  I always lap any rings that don't have some self-aligning feature, not necessarily because alignment was a big problem, but because I'm a perfectionist and like knowing everything is done correctly the first time, every time.

 

To lap vertically split rings, install the rings around your lapping bar, covered with lapping compound.  Tighten the rings just tight enough that they won't rock back and forth against the bases, yet still allow fore and aft movement of your lapping bar.  As you proceed with lapping, gradually tighten the rings a little at a time, but not completely tight, until you get about 70% cleanup of the i.d. of the rings.  The only way to determine the amount of cleanup is to remove the rings and visually look at the inside of the rings.  You will also feel the lapping bar move more easily in the rings once the i.d. surfaces begin to clean up.  Vertically split rings are more difficult to lap than horizontally split rings, and to a degree, lapping isn't essential unless the receiver is way out of alignment because the thin cross section of this type of ring will flex to correct for some misalignment.



Edited by RifleDude
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