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Talley one piece- My lapping experience

 
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  #8  
Old 01-27-2013, 03:39 PM
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Re: Talley one piece- My lapping experience

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Originally Posted by 260nut View Post
From an accuracy standpoint, you are probably correct. However those ring marks on your $600 scope are very real.
You got to be kidding me? Ive only got one scope that cost less than $600 and bolted down tight...what am i going to do...take it with me in a bikini on vacation??? Bolt it down...zero it in and LEAVE IT there.

At worst your only scraping finish...not gouging the aluminum.....nothing a can of spray paint cant fix if ever need be.

If you were using 2 piece bases they have a tendency to self align anyway....
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  #9  
Old 01-27-2013, 05:45 PM
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260nut,

That's an extreme case of poor ring alignment. I expect a poor base fit on Rem 700 actions, but that's really bad. You did the right thing by lapping.

If you hadn't lapped the rings you would have had problems later. Either the scope tube would have had severe stress when you torqued the ring screws down, or the scope would have had less than 10% surface contact with the Tally base, or both. Its likely you would have seen a shifting point of aim with temperature changes, and the scope would have slipped under recoil, making the ring marks even worse. .

One alternative was to bed the bases, but that's not easy with two piece bases. You have to mount both bases on a tube to keep them aligned during epoxy set. You still would have needed to lap the rings.

FYI, Tally integral bases are machined from extruded bar stock. The cylindrical ring surfaces are extruded, not machined. You can see the extrusion marks on the ring surfaces. I always lap Tally integral bases, even when they are aligned well. It's pretty obvious when lapping that the ring surfaces were not machined.
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  #10  
Old 01-27-2013, 07:11 PM
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Re: Talley one piece- My lapping experience

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Originally Posted by bruce_ventura View Post
260nut,

That's an extreme case of poor ring alignment. I expect a poor base fit on Rem 700 actions, but that's really bad. You did the right thing by lapping.

If you hadn't lapped the rings you would have had problems later. Either the scope tube would have had severe stress when you torqued the ring screws down, or the scope would have had less than 10% surface contact with the Tally base, or both. Its likely you would have seen a shifting point of aim with temperature changes, and the scope would have slipped under recoil, making the ring marks even worse. .

One alternative was to bed the bases, but that's not easy with two piece bases. You have to mount both bases on a tube to keep them aligned during epoxy set. You still would have needed to lap the rings.

FYI, Tally integral bases are machined from extruded bar stock. The cylindrical ring surfaces are extruded, not machined. You can see the extrusion marks on the ring surfaces. I always lap Tally integral bases, even when they are aligned well. It's pretty obvious when lapping that the ring surfaces were not machined.
Thanks for the info on their manufacturing process. I didn't have any first hand knowledge on their process and was just going on things I read in other posts. Others spoke of CNC machining as if it guaranteed perfection and that simply is not the case. I am glad that I lapped the rings and felt that it only made sense to have a precision mounting platform on a precision rifle.
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  #11  
Old 01-27-2013, 07:29 PM
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Re: Talley one piece- My lapping experience

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Originally Posted by Sully2 View Post
You got to be kidding me? Ive only got one scope that cost less than $600 and bolted down tight...what am i going to do...take it with me in a bikini on vacation??? Bolt it down...zero it in and LEAVE IT there.

At worst your only scraping finish...not gouging the aluminum.....nothing a can of spray paint cant fix if ever need be.

If you were using 2 piece bases they have a tendency to self align anyway....
I am not understanding you argument. If you choose to not lap, that is your prerogative. I don't like ring marks, so if I can take 45 minutes and a little elbow grease to eliminate a misalignment, I am gonna do it. I may decide to upgrade scopes in the future and will need to sell this one so I would like it to still be in good condition. If I damage it during a hunt then so be it, but I generally take very good care of my equipment. I see no reason to knowingly induce cosmetic damage when it can be avoided. Is it going to affect accuracy or function? Maybe, maybe not, but it is a FACT that my scope is more precisely mounted, with no stress, and more clamping surface than it would have been without lapping. The proof is in the pictures.
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  #12  
Old 01-27-2013, 08:49 PM
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Re: Talley one piece- My lapping experience

I lap all my talleys also, it makes me feel better.

gary
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  #13  
Old 01-28-2013, 10:51 AM
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Re: Talley one piece- My lapping experience

So you showed you lapped your rings. O.K.. What would have been useful to us is showing how and what you used to do so. I am a very big of Talley rings and I have never seen that much material needing removed from them. I hope the inside of that action is far better then the outside!
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  #14  
Old 01-28-2013, 12:04 PM
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Re: Talley one piece- My lapping experience

The inside of the action is fine because I trued it and I could have reworked the mounting holes but didn't see the need when lapping serves the same purpose. In all reality, the actual amount of material removed is probably far less than it appears in the pictures. Just guessing, maybe .005-.007". I was using 800 grit compound so it's not like I was going at it with 60 grit sandpaper or something. My main objective was to show that they were not perfectly aligned. As far as what I used and the procedure, Brownells 30mm lap bar and 800 grit lapping compound. I installed the bottom halves torqued to 25 in/lbs. I let them self align to the radii. Apply compound to the rings and place the bar in them. Then apply compound to the uppers and install them only snugging them so that the bar still moves. I used a combination of side to side, front to back motion and as the bar moved more freely, I would snug the uppers a little. From time to time, I would remove the bar to check my progress and repeat as needed. It was an easy process and well worth it IMO. I did it to eliminate scope damage and for more uniform clamping pressure.
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