Originally posted by diddlyv
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Accuracy fixed.
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If it's true that we are here to help others, then what exactly are the others here for?
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I have never lapped or glue-bedded but am thinking about trying it. Here's a question for you...
How do you insert the barrel extension with glue on it without it ending up on the face of the receiver? I'm thinking if the barrel is a reasonable fit it will push the glue onto the face where you don't want it. And if you put less glue on the extension to avoid this surely you could end up with air gaps, so not enough support? Do you push it in most of the way and then clean the excess off the receiver face with a cotton bud, prior to the final seating?
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I did mine verticle but basically just like this with a couple paper towels.
Put the barrel in verticle, cleaned the dripping stuff and put on the barrel nut to hold in place for 24 hours.Last edited by Bigs28; 07-09-2017, 06:53 PM.
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Originally posted by Bigs28 View PostI did mine verticle but basically just like this with a couple paper towels.
Put the barrel in verticle, cleaned the dripping stuff and put on the barrel nut to hold in place for 24 hours.
The guy smears the Loktite on the outside of the barrel extension, so the excess gets pushed to the front of the receiver as the two parts come together. There has to be a thin film of glue now between the face and the shoulder of the barrel extension.
What if the Loktite was applied to the inside of the receiver only? The excess then gets pushed into the receiver and not on critical surface of the shoulder. Harder to clean the excess because you've got to get into the receiver but at least there's less chance it ends up on the carefully lapped receiver face.
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Originally posted by Bigs28 View PostI spun by hand with the upper verticle with wheeler 320 grit lapping compound. I bought my lapping tool here
http://pacifictoolandgauge.com/ar-to...ing&results=13NRA Endowment Member, GOA Life Member, FPC Member, VDL Member
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Klem, there is no issue with a little loctite on the face of the receiver. The point of lapping and loctiting is to facilitate a "single piece of metal" barrel thru receiver. If there is a little loctite on the face ( after cleaning off the excess), when the barrel nut is torqued down, it just helps to insure that there is no slack anywhere between the barrel and receiver. If there is any space or gap anywhere in this transitional area, there is opportunity for movement at ignition which creates an upredictable shot to shot variation. Just remember that if a little loctite is a good thing, a lot of it isn't!
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Brian if your inserting it in the same direction as my post 36 then your not doing anything wrong. If it doesn't fit, then it doesn't fit. Mine was snug going in but it went in no problem. Contact Pacific tool and tell them the lapping tool doesn't fit and see what they say.
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I have gotten uppers that had been ceracoated and the internals were not masked before applyign the coating. The result was that the inside diamater was reduced to almost "too small" with excess material. If yours is ceracoated, the tool may not be the problem.
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Originally posted by Bigs28 View PostI did mine verticle but basically just like this with a couple paper towels.
Put the barrel in vertical, cleaned the dripping stuff and put on the barrel nut to hold in place for 24 hours.
Personally a barrel fit such as that really should have a shim as that fit is what I'd call sloppy.
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Originally posted by just_john View PostI have gotten uppers that had been ceracoated and the internals were not masked before applyign the coating. The result was that the inside diamater was reduced to almost "too small" with excess material. If yours is ceracoated, the tool may not be the problem.
I do not know if you can tell from the second photo but it seems there is too much material and it is butting up to it and stopping the tool from going in, and before anyone asks this is not how I was planning on using the tool, I just put it in the vise this way to take the pics lol.
NRA Endowment Member, GOA Life Member, FPC Member, VDL Member
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