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Which Scope Ring Lapping Tool?

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  #15  
Unread 12-31-2010, 08:39 AM
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Re: Which Scope Ring Lapping Tool?

Quote:
Originally Posted by Dr. Vette View Post
You'll like it.

Maybe you know this already but a couple of thoughts....

I put "drop rags" over my action and other parts when lapping to avoid getting any compound down into the action or anywhere else. I also mark the rings with a Dremel at the mating surface by one of the ring screws so I know which ring is front and which one is back, and which side is then left and right. A very tiny dot for the front left, and 2 dots for rear left, with the dots on both the upper and lower halves and I can identify any part if I ever take it apart again without having to worry about ring alignment or lapping.

The rings will have compound on them after the process. Be sure to clean them off thoroughly.

Have fun!

Thanks, I hadn't thought about marking the rings. That makes sense.
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  •   #16  
    Unread 11-01-2015, 12:02 AM
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    Re: Which Scope Ring Lapping Tool?

    So, should the lapping bars be exactly 1" and 30mm or should they be slightly undersized?
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      #17  
    Unread 11-01-2015, 12:24 AM
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    Join Date: Oct 2011
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    Re: Which Scope Ring Lapping Tool?

    Don't over lap and also get some "ring tape".
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      #18  
    Unread 11-01-2015, 02:36 AM
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    Re: Which Scope Ring Lapping Tool?

    Quote:
    Originally Posted by deepstuff View Post
    So, should the lapping bars be exactly 1" and 30mm or should they be slightly undersized?
    Better grades of drill rod, and not the Chinese stuff, will run about .001" under size. Same for standard grade Thompson Rod. precision grade is spec'd at .0005" under size. Most drill rod is just rough ground. I wouldn't be afraid of .001" or even .0015" undersize, as the size will open up slightly even if done carefully.
    gary
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      #19  
    Unread 11-01-2015, 09:04 AM
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    Re: Which Scope Ring Lapping Tool?

    Quote:
    Originally Posted by Trickymissfit View Post
    Better grades of drill rod, and not the Chinese stuff, will run about .001" under size. Same for standard grade Thompson Rod. precision grade is spec'd at .0005" under size. Most drill rod is just rough ground. I wouldn't be afraid of .001" or even .0015" undersize, as the size will open up slightly even if done carefully.
    gary
    So how undersized should it be?
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      #20  
    Unread 11-01-2015, 03:06 PM
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    Re: Which Scope Ring Lapping Tool?

    Quote:
    Originally Posted by deepstuff View Post
    So how undersized should it be?
    I would go .001" undersize, and try it out on an old set of rings. The one thing I don't like about Thompson rod is that it's hard (62RC+). Ideally, I'd rather have something a lot softer, but also very round and strait. A piece of ground finished 8620 (also to the needed size) would be about perfect as it's somewhat porous and has a 15rc. Hopefully the compound would embed into the metal better. But there's a much better way to lap rings if you have access to a lathe.
    gary
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