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Ring Lapping

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/09/2005 at 16:33
rmeredit View Drop Down
Optics GrassHopper
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I'm new to the world of lapping & am wondering if some of you could give me tips/recommendations/etc.

I recently purchased some Talley Lightweight *Aluminum* rings and a Sinclair 1" lapping kit (came w/ the lapping rod, handle, and the compound - which I believe was 280-grit).

I began lapping the rings & it looked like I got a nice pattern, with about 80% contact. I cleaned up the rings w/ rubbing alcohol & wiped all (or so I thought) the residue away. The scope fit *really* nice into the rings but then the problems surfaced. It appears the some of the compound/shavings stuck around (maybe in the pores?) and it scratched the crap out of the scope when I slid it back to adjust for the eye relief. I didn't have the rings tight at all. They left a silver "residue" in the finish of the scope.

Did I do something wrong w/ the lapping? Maybe you can't lap aluminum rings b/c they hold on to the compound b/c it's harder than the aluminum? How do you clean these things up after lapping? Will this happen w/ steel rings?

Any tips/ideas are appreciated.

-robert
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/09/2005 at 18:17
cheaptrick View Drop Down
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I have never heard of lapping aluminum rings, so I can't comment on that aspect.

 

But, is the scope slipping in the rings? Other than the scratches and the residue, does the scope move when the rifle is fired??

 

Sorry for your dilemma, sincerely. 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/09/2005 at 18:50
rmeredit View Drop Down
Optics GrassHopper
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I didn't get around to locking down the scope b/c there was so much 'residue' on the scope from adjusting it forward-to-back.  I imagine it would lock down fine.  But, I couldn't bring myself to leave it like that.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/09/2005 at 19:23
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Optics Jedi Knight
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Try a heavier solvent in cleaning both the rings and the scope tube. Something like WD-40 and try to "spray" it out- if it doesn't work there is a good chance the lapping cmpd. is a water soluable type. It 40 doesn't work then try plain water. Use dental contact paper (or type writer carbon paper if you can find any) to determine if the the scope is hitting high spots. If the scope tube is the black enamel type extra care must be taken (obviously) but try a very light brushing or wiping with 0000 steel wool. Al does not lap or file well it smears. If you want to lap Al use various grades of Wet and Dri under oil, finishing with Carburetor cleaner as a final cleaning and then air blow with something like compressed computer cleaning gas. Water soluable (Clover) laps will "embed" in the Al. (by now you are an expert on that). Hope this helps.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2005 at 19:22
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Optics GrassHopper
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If you are still getting shavings/particles from lapping use Gun Scrubber instead of WD-40.  The Gun Scrubber will not leave a film of oil on the rings.  It will blast away all the particles and will be clean when you are finished.  The WD-40 will be very difficult to remove since it contains oil, not good for scope to ring fit. 

Just my two cents worth!!!  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/18/2005 at 16:11
DarksideSix View Drop Down
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I just lapped an aluminum 3-ring set last night with the same Sinclair tool & compound and didn't have any problems.  I didn't even think about the rings being aluminum or if you could lap them or not.  Doesn't seem to be any problems so far.

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