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Bolt lug engagement #4 rifle

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Canuck View Drop Down
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    Posted: October 23 2016 at 3:49pm
While fitting a non numbers matching bolt body to a Long Branch project I am working on, I figured I might try the candle blackening method of marking the engagement lug surfaces to check for even contact with the receiver. Boy, was that ever easy! I could easily see where the black soot was rubbed off. Perfect fit, nice and solid. I also had to fit another .630" bolt head to replace the one that was on it because it didn't have the tapered bolt head slot needed for a #4/MK1*. I used my coin type head space gauges and the whole assembly passed the test, won't close on the .074 gauge. Good striker protrusion too. Just having too much fun on a rainy weekend indoors in the shop.
Castles made of sand slip into the sea.....eventually
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 23 2016 at 4:13pm
Smoking with a candle may be old school but it works!
PitBull, spawn of Rottie!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bear43 Quote  Post ReplyReply Direct Link To This Post Posted: October 23 2016 at 5:06pm
How do you do the candle blackening? I have never done it before but I have heard many times it is very effective.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: October 23 2016 at 5:18pm
I just cleaned the lug surfaces well, then lit a candle and let the flame tickle the lugs creating a bit of smoke and that was it, really simple. Then you just insert the bolt into the channel, push it all the way forward and close the bolt a few times then open it up, remove it again and check the mating surfaces for black soot removal. The rest of the black that doesn't come off is where there is no engagement so I just easily wiped it off and lightly oiled the surfaces and put it back in.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Quote  Post ReplyReply Direct Link To This Post Posted: October 23 2016 at 7:30pm
Originally posted by Shamu Shamu wrote:

Smoking with a candle may be old school but it works!


 A lot of the bespoke gunmakers still use the smoke lamp method for barrel fitting.
Rottie (PitBulls dad.)


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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: October 23 2016 at 9:20pm
OT - can you imagine what all that candle soot does to you furnace filters and ducts ? just sayin ...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pukka Bundook Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2016 at 6:25am
A square,
I don't imagine anyone fitting bolts using lampblack all day every day. LOL
 
 I do mine out in't workshop where the fire smokes anyway!
I have  a tin of Prussian Blue as well, and that works just the same.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ArcherSix Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2016 at 6:27am
Yup...this method works quite well. I'm far from a 'Bespoke Gunsmith', but I use this all the time to check and fit parts. I keep a bic lighter in the toolbox just for this. Works just as well as a candle, or the little alcohol lantern we had at gunsmith school.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2016 at 6:31am

To get a really nice smoke smudge you light the candle & let it warm up. then you pass the surface to be marked just above the tip of the flame with continuous motion till you get a light layer of smudge.
I use it when setting up dies for partial full length resizing to match the case reworking to the chamber dimensions.
like this:


Contact with the die "scrapes away" the soft soot, showing where contact has, or hasn't, been made. The same idea works for any pair of contact surfaces such as bolt lugs.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2016 at 10:28am
Then he gets a chimney sweep to scrub the barrel outClown
Rottie (PitBulls dad.)


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Born free taxed to death!!!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2016 at 12:36pm
Nah, just fire a few blanks made with Unique, aka "Flammable Dert"!
PitBull, spawn of Rottie!
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