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Old February 11, 2018, 03:30   #1
Aeroscout
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L1A1 Breaching washer Question

I am hoping someone will know this off the top of their head (or how to do the figuring).

I have an inch barrel that hand times to 12 o'clock using a .0580 breaching washer.

How much bigger/what size breaching washer do I need to get to get it to the sweet spot?

0632?

TIA
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Old February 11, 2018, 03:35   #2
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Could you back it off to 11 o clock and use a feeler guage?
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Old February 11, 2018, 03:45   #3
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Originally Posted by embatp View Post
Could you back it off to 11 o clock and use a feeler guage?
That would definitely work, but I think I found my answer via math rather than messing with trying to get a stack of feeler gauges to fit the gap. 1 clock position is .0052

Now that the cobwebs are blowing off, I think it was Leland that also advised me to go just a tad bigger, just in case.

I think .0633 is probably the safe bet.

ETA: I will double check with feeler gauges. Seems this is over standard size?
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Old February 11, 2018, 05:05   #4
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You'll need a 0.063" worth of thickness...and yes, you'll likely need to use a shim AND a breeching washer (thickest standard one is #10 @ 0.061"). I once had a FAL barrel that hand-timed 12:00, and [after an exorbitant amount of calculation] a 0.005" shim brought it to 11:00 like a charm. Thus, I simply added 0.005" to your 0.058 washer thickness to come up with that number -- I figure each 'hour' on the clock to be 0.005". Best of luck sir
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Old February 11, 2018, 08:47   #5
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I can make you one the thickness that you need if I don't already have the size you need. I don't like, nor recommend, stacking any shims to get the desired thickness. PM if interested.


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Old February 11, 2018, 16:12   #6
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I completely agree with Leland. This may help if you can read my chicken scratchings......


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Old February 12, 2018, 14:30   #7
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Good stuff there Rick. Thanks for posting.
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Old February 13, 2018, 13:51   #8
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except you really can't use a .001" (let alone a .0003" shim), Even a .002"is fragile and may tear.

Also, different receiver faces and barrel shoulders have different degrees of compression under torque. Fully heat treated receivers like Coonan and DSA do not have as much give as FN spec differentially heat treated receivers. FN barrels tend to have less give than IMBEL, and IMBEL less than L1A1. Izzy FALO seem to have the most give so I generally hand time those a bit short, and that's after cranking it on and breaking it free several times to reset the threads.

Also, if it is a used breeching washer, it will have a tad less give than a new one.

All that being said, If you're hand timing to 12, I recommend a .003" added, between the shoulder and your current washer.
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Old February 13, 2018, 20:54   #9
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except you really can't use a .001" (let alone a .0003" shim), Even a .002"is fragile and may tear.
.....
Fair enough, I just used the 2 degrees as a math example.

I am currently working on an Izzy FALO and ran a 1 x 16 die over the first 3/4 of the threads. To fit these barrels to a standard metric receiver, do you re-thread all the way to the barrel shoulder or leave a small number of threads untouched?


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Old February 13, 2018, 22:00   #10
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Using a liberal amount of good machine oil, thread all the way up with the die using the lead in side, then clean the die/threads and turn the die around, oil and thread all the way up.

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Old February 13, 2018, 22:38   #11
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Using a liberal amount of good machine oil, thread all the way up with the die using the lead in side, then clean the die/threads and turn the die around, oil and thread all the way up.

Leland
Thanks for the tips. The threads on the barrel now feel loose when threading on the receiver. Is it because the threads are not not fully engaging due to re-threading?


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Old February 14, 2018, 05:33   #12
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Thanks for the tips. The threads on the barrel now feel loose when threading on the receiver. Is it because the threads are not not fully engaging due to re-threading?


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Correct.

1" = 25.4mm

But don't worry about it, you have plenty of thread engagement. It's like going from a class 2 to a class 3 thread. Heck, even 60% engagement isn't going to come apart.

Just crank it on hard and break it free a few times before looking for hand timing position.
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Old February 14, 2018, 05:44   #13
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^^^GP with the crack of dawn tip.


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Old February 14, 2018, 05:52   #14
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^^^GP with the crack of dawn tip
Heck, sunrise isn't for another 3-1/2 hours here.

Once or twice a week I've been waking up around 0230-0300, ready to go. It's annoying because the next day I'll be not wanting to get up with the alarm at 0530. Fortunately, I have a short walk to work. If I could consistently get by on 6 hours or less of sleep, that would be great, but it's not consistent. Other times even 8 hours leaves me cursing the alarm.
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Old February 14, 2018, 09:29   #15
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Slept 3.5 hours last night which was huge for me with Short Sleeper Syndrome. Be proud and happy for regular sleep, after 40 years it gets boring being awake over 20 hours per day on average as can't be productive entire time or body gets very tired. Have to spend several hours just sitting super still and reading so muscles and entire body are not totally worn out before sunrise. When first wake try to lie still staring at ceiling for an hour before grab tablet. If I try to go ahead and do some tasks since awake in few days too tired to walk but can't sleep even if take best sleep meds, don't affect my body at all, 1.5 to 3.5 hours is average night sleep logged by my BiPap ASV machine. Your blessed if able to get eight hours at a time.
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Old February 14, 2018, 09:57   #16
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What materials did the various manufactures use for their breeching washers, was it just a mild steel, or hardened - would it matter even? Dimensions seem to be OD-1.188", ID-.998" and then of various thickness to adjust for purpose. Some of the B/washers I have seem to be Blued, as might be thin spring steel, others appear to be perhaps stainless - there seems to be a mixing of materials for B/washers - I am guessing there are many variants in materials for the washers, which might be correct, thoughts please?
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Old February 14, 2018, 10:25   #17
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I have a nice Bridgeport surfacing machine. If someone needs a little taken off a washer just let me know how many thousandths and can hit it right on head then demagnetize when done. Call it a Files Favor since such easy task.
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Old February 14, 2018, 21:01   #18
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Quote:
Originally Posted by gunplumber View Post
Correct.

1" = 25.4mm

But don't worry about it, you have plenty of thread engagement. It's like going from a class 2 to a class 3 thread. Heck, even 60% engagement isn't going to come apart.

Just crank it on hard and break it free a few times before looking for hand timing position.

Thanks gp. Much appreciated as you allayed my concerns about the lack of thread engagement.
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Old February 15, 2018, 16:58   #19
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I finished munchoman's breeching washer, shipped it yesterday and have already received his funds. A smooth transaction. We'll see how his build goes soon, I hope.


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Old February 15, 2018, 18:21   #20
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I finished munchoman's breeching washer, shipped it yesterday and have already received his funds. A smooth transaction. We'll see how his build goes soon, I hope.


Leland
Leland,

The breaching washer we talked about and was the subject of this very thread....well.....the Brit barrel that I considered using for my Indian build using a DSA Brit cut receiver. That barrel is now probably going on a Canuck clone. An Aussie barrel is now likely going to be used on the Indian. As soon as I get done with the Brit barrel going on the inch para.

Like a fart in a skillet I tell you.

I'll be in touch.
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Old February 15, 2018, 18:42   #21
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Like a fart in a skillet I tell you.
That made me shit-giggle a little
I'm gonna use that in the future, for sure...
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Old February 15, 2018, 22:54   #22
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Aero, I would put the Aussie barrel on the Canuck build since there are not many markings like the Brits. Just my 2 cents. I like those Canadian models.....mmmmm.

I sorta "found" this L2A1 barrel and now need to start gatherin' up some parts, possibly to be a C2A1. We'll have to start another thread so we don't muck up this one.


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Old March 02, 2018, 19:53   #23
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Aeroscout's breeching washer completed tonight and packed up to go out tomorrow.






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Old March 03, 2018, 02:54   #24
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Quote:
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That made me shit-giggle a little
I'm gonna use that in the future, for sure...
Well there is more where that came from
The plans for the Brit kit have changed once again.

Quote:
Originally Posted by FUUN063 View Post
Aero, I would put the Aussie barrel on the Canuck build since there are not many markings like the Brits. Just my 2 cents. I like those Canadian models.....mmmmm.

I sorta "found" this L2A1 barrel and now need to start gatherin' up some parts, possibly to be a C2A1. We'll have to start another thread so we don't muck up this one.


Leland
I bought another L1A1 Sporter....picking it up tomorrow, hoping for an Aussie barrel. We'll see as it wasn't clear to me which barrel is on it. But the price was right......so.....

I know EXACTLY what you mean!
Muck away!

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Aeroscout's breeching washer completed tonight and packed up to go out tomorrow.






Leland
Awesome Leland......Hopefully I have the right size locking shoulder and I can finish one up.

Thank You!
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Old March 20, 2018, 15:20   #25
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I just finished the last of the three breeching washer requests from this thread for hkshooter. This one is .069" thick. Good luck to all in the builds.






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Old April 01, 2018, 15:23   #26
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Quote:
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I just finished the last of the three breeching washer requests from this thread for hkshooter. This one is .069" thick. Good luck to all in the builds.






Leland
Leland's shim showed up, this is the result.
Leland is a gentleman. He made the shim exactly to the determined spec and offered good advice along the way, all for a paltry price, should have charged double.
Thanks Leland.
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Old April 01, 2018, 15:25   #27
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I'm glad I could be of service and the rifle turned out great. The Inch guns are the sexiest of them all, in my opinion.

GO INCH!!


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Old April 01, 2018, 16:50   #28
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Good job!
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Old April 01, 2018, 19:08   #29
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