Valve mod - pcp pistol |
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RangerPete
Senior Member Joined: 18 Apr 2023 Location: Cambridge. Status: Offline Posts: 884 |
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Posted: 19 Nov 2024 at 5:48pm |
Thats really good Pauly
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Walk quietly, but carry a big stick.
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J-S
Senior Member Joined: 19 Oct 2014 Location: Auckland Status: Offline Posts: 425 |
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Looks f@#king cool. wish i had the skills!
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J S Airguns
Air Arms TX200('s) Theoben Sirocco HW77 FWB 300s Webley Patriot One or two others... Current projects: Too many.. |
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Pauly5
Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1410 |
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That's what is motivating me. I mull over something for a few days then go and make it.
I plan to feature a bit of nice wood on this too. I have some walnut for it. This is a mockup with a grip I had made ages ago, but I don't really like it. I will put some wood under the tank too. That should hide the industrialousness look of the tank. Excuse the mess. |
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jwabfrog
Senior Member Joined: 12 Nov 2021 Location: Thames Status: Offline Posts: 142 |
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Awesome Pauly, I am learning vicariously. It will be super satisfying to shoot knowing you've made the entire thing!
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Pauly5
Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1410 |
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Here you see the stainless probe being tapped. I learnt that with the harder material you need the correct drill bit size. A std drill set has a 4mm drill bit, but it is most likely 3.9 mm, but a 4.2 mm drill bit is required for an M 5 tap. How many taps did I break learning this? New tap set has 3 taps per size. Tapered, intermediate and bottoming. So you need to run all three through to get the final size hole. Fortunately I am enjoying all this learning. The bolt handle will be a straight pull, being retained by a sprung clip. This way you can also close the bolt by the handle, or by pushing bolt with your thumb. Bolt just temporary for now. |
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Pauly5
Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1410 |
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So having said that I have made some more progress on this build.
I remade a new fill valve with protection for the gauge. The fill valve is a simple but effective system. I milled off some threads from the screw to let air past and the O ring stops it getting out. Breech has been drilled and holes tapped to secure it to the tank/body. Cap screws sized and retaining holes drilled, tapped and counter bored for them to hold in the fill and main valve body. Basically I took off the knurling so there was an exact fit. |
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Pauly5
Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1410 |
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I got myself a proper drill and tap set. Amazing what a difference it makes having the correct drill size, especially when tapping stainless. |
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Pauly5
Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1410 |
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Next I contoured the base of the breech to fit onto the 32mm tank. I used a combo of flat end mill and a 32mm wood bit.
Unfortunately the wood bit isn't an exact shape with a flat spot making the resulting cut a bit like a flattened dome, so I cut a chanel out with the end mill so there's good contact. I will use a bit of fine sandpaper on a tube to take the sharp edges off the cut later. So you can see what look like corrugations in the cut face. This is probably from my small mill picking up vibrations, but for this purpose it's fine and the light makes it look worse than what it is. |
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RangerPete
Senior Member Joined: 18 Apr 2023 Location: Cambridge. Status: Offline Posts: 884 |
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Thats all looking really smart Pauly. Amazing stuff you'r doing there!
Im very keen to see how it is all going to come together |
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Walk quietly, but carry a big stick.
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Pauly5
Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1410 |
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I had a good stint in the garage this weekend and have made good and steady progress on this build. I have found that accomplishing one section, then have a cleanup, small break, then onto the next is working well for me. It helps me clear my head for the next part. Not to mention making my wife a coffee and a quick chat too.
So I got the barrel fitted then milled out the loading breech. then drilled and tapped two retaining grub screws for the barrel. Next I chamfered the corners on the top. I'm not totally sure what I am going to do here, but have been toying with keeping it with clean lines and mount a small red dot. I could also fasten a weaver rail to it The result emerged from the aluminium mess.` Now that the barrel is fitted I was able to start on the bolt. This turned out really well and confirmed that the barrel and bolt are nicely lined up.Alu had an 8.5mm bore and I reduced the stainless bolt to 8.3 mm at the back and 6.03 mm for the probe part and it slide into place beautifully, so I am very pleased with that. I had also made a preliminary mockup for a fill valve to include a gauge. This is not the final piece, but I know what I want to do. Gauge is mounted into a boss that I plan to have a barrel support fitted to. Fill probe fits nicely underneath it. I just need to get a 10mm x 1.0mm thread tap for the gauge. Also see the finished firing valve body, poppet and seat. They came up really well and I am excitied to see how well it works. Looks good for now anyway. Note the custom Nunga forged brass wrapped in my hori custom made spring. |
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