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The $100 challenge.....
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KiwiTR6 View Drop Down
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Posts: 269 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KiwiTR6 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2023 at 9:00pm
Bill, you're more game than I am! I'm going to leave the barrel in place and try to crown it by hold the breech block in my 4-jaw and support the other end in my fixed steady.  Will take a little bit of setting up and I'm not sure it'll work but I'll give it a go.

I finished my PTFE seal and made up a top hat (I think I've got it right this time?) so only the buttons to go. I've put a rubber washer under the seal to take the shock and hopefully protect the sharp leading edge I've formed.

Paul, this is the link to the case hardening powder I've just ordered > https://www.ebay.com/itm/225611131542





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Billbobnz View Drop Down
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Posts: 865 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Billbobnz Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2023 at 9:15pm
Thanks Kiwi, I'm so far down digging the hole I'm in I just having to plough on....

I do like the seal and top hat you've done..

Somewhere at work I have some spare polymer parts of different densities left over from a job I did ages ago. I'm going to attempt to make a new breech seal with these and possibly piston seal if they are wide enough.
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RangerPete View Drop Down
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Posts: 881 		Post Options Post Options   Thanks (0) Thanks(0)   Quote RangerPete Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2023 at 11:33pm
Wow, it is pretty impressive seeing what you guys are all up to.
I wish I had the knowledge, and the tools to be able to make all of these things.
My “improvements” will probably just be to strip, clean, and if I’m lucky, reassemble 😂

Got a question… last time I shot it I still had a little bit of smoke comming out the barrel, but I’m 100% certain there is no oil or solvent left in the barrel. Could this be oil comming out of the compression tube/piston area?
When I get around to lubing and re assembling, is silicone grease any good as a lube for the piston?
Walk quietly, but carry a big stick.
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KiwiTR6 View Drop Down
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Posts: 269 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KiwiTR6 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2023 at 7:44am
Mine was very smokey and when I pulled it down it had been lubricated with what appeared to be used engine oil, it was very dark brown in colour.  I'll leave it to someone more knowledgeable to comment on the use of silicon grease.
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Pauly5 View Drop Down
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Posts: 1401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2023 at 7:46am
Originally posted by RangerPete RangerPete wrote:

Wow, it is pretty impressive seeing what you guys are all up to.
I wish I had the knowledge, and the tools to be able to make all of these things.
My “improvements” will probably just be to strip, clean, and if I’m lucky, reassemble 😂

Got a question… last time I shot it I still had a little bit of smoke comming out the barrel, but I’m 100% certain there is no oil or solvent left in the barrel. Could this be oil comming out of the compression tube/piston area?
When I get around to lubing and re assembling, is silicone grease any good as a lube for the piston?

It would works for the seal, but I don't think it's best for metal on metal. The big thing is that due to the pistons action it migrates forwad, which is what makes moly ideal as it really only needs a smearing. I can send you some moly in the post if you like? It goes such a long way as you don't use much.

Did you rinse out the compression tube area? I gave it a blast with brake cleaner then a good wipe with a rag and my smoke has now stopped after I put it back together.
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kruzaroad View Drop Down
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Posts: 2265 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kruzaroad Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2023 at 7:53am
You and me both with the "wow OK that's a little more involved than I'll be doing" pete.
But on the plus side doesn't seem that all the work is giving any significant gains... Yet.
When I pulled the piston out the chamber had way to much oil in it. Enough to pool, so that is the most likely cause of the smoke.
Graphite grease seems to be the what is most commonly recommended for piston chamber. Crossman make cylinder lube for springers (not to be confused with pelgun oil used for pumpers and CO2, which I did first off) handy stuff to have for any of your springers.
As for all the stuff going on with it all, if you can take the movement out of your barrel, get your piston running smooth and strait, have your seals sealing good your still way in the running for tighten your groups. Pellet choice will prob aid it alot as well.
The trigger being lightened will help heaps too. I'm contemplating putting a small angled hole in the front trigger gaurd and threading it (by using the screw I will put in) to make a stop for trigger reseting to far forward. (inspired by trigger adjustment shown previously but taking all the complicated work out of it.)
Remember it's about tightening the groups not engineering the parts in end.
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kruzaroad View Drop Down
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Posts: 2265 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kruzaroad Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2023 at 8:05am
With the piston your after a grease that doesn't detonate. I think the edge of the pistons seals can reach upto 700 deg (not sure if that f or c) but it causes the grease (petrolium based greases in particular) to detonate causing a increase in pressure within the chamber. This gives uneven pressures from shot to shot, causing differnt impact points of pellet. It can also dam damage the seal.
Look up dieseling on the Web.
It is not recommended to do this but check it out to see what I'm on about.
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Pauly5 View Drop Down
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Posts: 1401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2023 at 8:39am
Originally posted by kruzaroad kruzaroad wrote:

 
I'm contemplating putting a small angled hole in the front trigger gaurd and threading it (by using the screw I will put in) to make a stop for trigger reseting to far forward. (inspired by trigger adjustment shown previously but taking all the complicated work out of it.)
Remember it's about tightening the groups not engineering the parts in end.

I had thought about that way too. I was thinking about using a backing piece inside the hollow trigger to thread into, but it could be fiddly.

For brazing, how well would silver solder that we use for electrical connections work?
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KiwiTR6 View Drop Down
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Posts: 269 		Post Options Post Options   Thanks (1) Thanks(1)   Quote KiwiTR6 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2023 at 8:48am
I'm sure normal electrical solder would be fine Paul, there's no real load on the adjuster.  I just happen to have some silver-solder which is stronger and flows really nicely if you strategically place tiny little off cuts.
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jwabfrog View Drop Down
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Posts: 141 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jwabfrog Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2023 at 8:50am
Kiwi, your engineering skills are impressive! Looks super nice. Well done
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