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Valve mod - pcp pistol
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kruzaroad View Drop Down
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Posts: 2492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kruzaroad Quote  Post ReplyReply Direct Link To This Post Posted: 04 Dec 2024 at 5:31pm
Probly is to fast pauly.
Was watching video a week or so back and dude was having trouble with the drill hardening stainless around holes. Apparently stainless tempers at very low heats.
Might have to set up cutting fluid bottle with gravity feed and flow adjustment or something to keep temp down
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Pauly5 View Drop Down
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Posts: 1561 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Dec 2024 at 5:18pm
Work has been very busy the last couple of weeks, so progress has been slow. I have also had issues drilling and tapping this damn stainless probe. I thought I had it sorted, but I now think I had the drill speed too fast.
I also bought myself some decent metal cutting paste too.

Anyway, one thing I bought off FB marketplace was a Rotring  drawing board for $30. When I was at school I loved Technical drawing and used to have a similar board. I have a few of my parts hand drawn, so now I can draw them to scale. 

When making the part, I can now concentrate on the making rather than design and turning at the same time.

The probe is on it's 3 rd design change now and I am pretty sure this is going to work. I also made the hammer which you can see in the photo.
 It is made from steel, but has a delrin skirt that is just a touch bigger, so it runs on the delrin.  Aluminium is quite a sticky material and the delrin solves the friction between the steel and alu, especially when cocking. In my other pistols I have had to generously lube the tube to overcome this issue.

I also started on the grip, doing a trial run using some birch ply glued together. I plan on making the grip from some walnut I have. So I'll update that once I get into it properly.
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nunga View Drop Down
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Posts: 1050 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nunga Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 2024 at 11:49am
yeah you need to be very careful with the threads. Pinning is the safer way to go for sure.

1 psi = 0.070306958 kilogram-force/sq. cm
1 kilogram-force/sq. cm = 14.2233433071 psi

Example: convert 15 psi to kilogram-force/sq. cm:
15 psi = 15 × 0.070306958 kilogram-force/sq. cm = 1.0546043695 kilogram-force/sq. cm


So 3000PSI equals 210.9KG of force.
2nd place HP springer - WFTF World Championships 2014
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Pauly5 View Drop Down
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Posts: 1561 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 2024 at 10:42am
Thanks Ian,  I had actually watched that on Saturday.

I would be keep to give the threading a go as opposed to pinning the valves. I am cautious with all that pressure, so until I have seen the correct calculations from a competent person, I wouldn't try it.
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nunga View Drop Down
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Posts: 1050 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nunga Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 2024 at 10:37am
I found this video on youtube, might be of some use.
2nd place HP springer - WFTF World Championships 2014
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RangerPete View Drop Down
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Posts: 976 		Post Options Post Options   Thanks (0) Thanks(0)   Quote RangerPete Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2024 at 12:48pm
Thats really good Pauly
Walk quietly, but carry a big stick.
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J-S View Drop Down
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Posts: 453 		Post Options Post Options   Thanks (0) Thanks(0)   Quote J-S Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2024 at 5:09am
Looks f@#king cool. wish i had the skills!
J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

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Too many..
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Pauly5 View Drop Down
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Posts: 1561 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2024 at 3:58am
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 View Drop Down
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Posts: 155 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jwabfrog Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2024 at 3:39am
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 View Drop Down
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Posts: 1561 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2024 at 5:59pm
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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