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Upper Lapping Tools, any recommendations


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#1 ONLINE   ewallover

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Posted Oct. 12 2017 - 09:59 PM

Wheeler, Stoner, Brownells? Whos lapping tool have you had the best success? Ive seen great reviews for the Wheeler and Ive seen a few for the same product that would make even the most seasoned hobbiest run for the hills. I do like the flexible bit as it would appear to eliminate undue pressure on soft aluminum. What grit lapping compound do you have the best results. Lap, look, lap some more, and stop as soon as all of the finish is uniformly removed from the face of the Upper. With the Wheeler kits 200 grit compound, is that too aggressiveness for an aluminum Upper or is it sufficient for the job? Im not going to lapping a ton of uppers. Only one for starters, but I would like to select a serviceable tool just in case I get the bug to build another...

Edited by ewallover, Oct. 12 2017 - 10:04 PM.



#2 ONLINE   MontanaLon

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Posted Oct. 12 2017 - 10:18 PM

I have the wheeler and it does just fine. Honestly if I were you and was going to do a bunch of receivers I would come up with a way to do it without the lapping compound. It gets inside the receiver no matter how hard you try to keep it out. 

 

I had a couple of ideas but never did anything with them as I don't really do it enough to make it worthwhile. 

 

It wouldn't take much work machine tool wise to make it work and would be good practice. My one idea used sheets of wet dry sandpaper so if you really wanted you could do something coarser or finer than 220 grit. Though in my experience 220 is about the right compromise between material removal and resulting finish.


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#3 ONLINE   ewallover

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Posted Oct. 12 2017 - 10:42 PM

Thanks. I was planning on flushing the stuff out with isopropyl alcohol, drying and re-oiling or greasing any areas that need lubricant. I’ve treated the threads with choak tube high heat grease and have been running the barrel nut on and off the work any miling residue in the threads before I mount the new barrel.


#4 OFFLINE   gshayd

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Posted Oct. 12 2017 - 11:58 PM

I don't think it makes much difference. I got mine from Brownells




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#5 ONLINE   ewallover

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Posted Oct. 13 2017 - 06:53 AM

The only reason I asked is that the Wheeler has (on occasion) not been properly machined to insure that its centered. But like I said, the vast majority of the reviews have been highly positive. Looking for a quality tool to do the job correctly.

Edited by ewallover, Oct. 13 2017 - 06:54 AM.



#6 ONLINE   GLShooter

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Posted Oct. 13 2017 - 10:01 AM

PT&G lapping tool.

 

https://www.brownell...-prod20220.aspx

 

Greg




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#7 OFFLINE   Stj

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Posted Jan. 02 2018 - 03:06 PM

Hi, what are you lapping? The face of the threaded piece?


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#8 ONLINE   GLShooter

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Posted Jan. 02 2018 - 03:50 PM

Hi, what are you lapping? The face of the threaded piece?

 

Yes he was and he did. Now we see what the fruits of his labor will be if he catches some decent weather. 

 

:party2:

 

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#9 OFFLINE   Stj

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Posted Jan. 02 2018 - 05:42 PM

Thanks for the clarification I'm not new to ars but I'm just starting my first build and hadn't run across this yet.


#10 OFFLINE   stoner51

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Posted Jan. 02 2018 - 05:52 PM

I have one from wheeler.  Actually two because one doesn't seem to be centered.  I called wheeler they sent another kit.  

 

steve




#11 ONLINE   GLShooter

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Posted Jan. 02 2018 - 06:11 PM

Thanks for the clarification I'm not new to ars but I'm just starting my first build and hadn't run across this yet.

 

While it is not an absolute necessity it never hurts. A local knowledgeable shop will usually do it for $25.00 or less.  All of mine have been done since I started doing this stuff last century. Anecdotal evidence suggests that in many cases it does improve accuracy and in some it even stopped repetitive bolt breakage, 6.5 Grendel, so it is a good idea.

 

Greg




#12 OFFLINE   schrödinger's cat

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Posted Jan. 02 2018 - 08:44 PM

I wanted the Pacific Tool but ended up getting the Wheeler for a great price. It's not necessary but I took a digital level and made sure my upper was perfectly level in my vise with the face straight up, I then put a bit of the compound on the lapping tool and turned it by hand, without putting any pressure on it. I periodicaly stopped to check the mark and wiped off any compound that looked like it was going in the upper. It didn't take long at all to do by hand, and I was super careful to get every bit of compound off the threads.


#13 ONLINE   hzhardy

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Posted Jan. 02 2018 - 09:00 PM

I have a brownells tools at the shop on loan and i do not think it is hard enough. It has only done about 4-5 recievers and there is a distinct groove being worn in its lapping face. I have taken mine as fine as 600 grit lapping compound


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#14 ONLINE   GLShooter

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Posted Jan. 02 2018 - 09:41 PM

Maybe you should try a real cutter set up. That's what Ritch went to.

Greg





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