Valve mod - pcp pistol - Kiwi Airgunners Forum

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kruzaroad

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Joined: 02 Jul 2022
Location: Hastings 4 now
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Posted: 22 Sep 2024 at 12:16pm

It has quite a high polish to it.
Think you have to be careful with the pics, one thing I've noticed is they tend to make very miniscule grooves look huge. You can't always believe a pic.

Pauly5

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Posted: 27 Oct 2024 at 12:56pm

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. Wink

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.

RangerPete View Drop Down

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Posted: 27 Oct 2024 at 2:32pm

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

Walk quietly, but carry a big stick.

Pauly5

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Posted: 28 Oct 2024 at 9:09am

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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kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2255	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 22 Sep 2024 at 12:16pm
	It has quite a high polish to it. Think you have to be careful with the pics, one thing I've noticed is they tend to make very miniscule grooves look huge. You can't always believe a pic.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1401	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 27 Oct 2024 at 12:56pm
	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.

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 18 Apr 2023 Location: Cambridge. Status: Offline Posts: 878	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 27 Oct 2024 at 2:32pm
	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
	Walk quietly, but carry a big stick.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1401	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 28 Oct 2024 at 9:09am
	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.