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All Springer/NP/PCP Air Gun Discussion General > "Bob and Lloyds Workshop"
Carbon fiber tube questions
mackeral5:
--- Quote from: rkr on March 06, 2023, 11:10:02 AM ---
--- Quote from: mackeral5 on March 06, 2023, 07:19:27 AM ---
--- Quote from: rkr on March 06, 2023, 03:58:00 AM ---Mike, my experience with long airgun barrels is that you need a tight barrel band for consistent accuracy. The best group with that setup so far is 12.5mm 5 shots at 100M and I did 3 groups under 15mm in that range session.
--- End quote ---
I do appreciate your real world experience. Your. 257 one I often use as a point of reference, a point of measure.
On a short tubed gun such as the brod pictured, do you think a barrel band at the tank block would be worth the effort?
My .25 Gauntlet is setup that way and can shoot accurately. However one must NOT touch the tank, or POI will move. Applying any vertical or lateral pressure to the tank normally results in a POI shift.
The Brod tank/block interface is much more robust than the Gauntlet, perhaps it would not be as sensitive.
I may try to fab up a temp/reversible solution and test.
--- End quote ---
I would give it a go, as said copy Bob's design and if it improves your groups you can then try a more permanent solution. I have my barrel band attached to both air tube and the stock making it extra stiff, perhaps you could try making some sort of extension for the stock that extends under the bottle and ties to the barrel band? It would be a good idea for rested shooting as well.
--- End quote ---
One last post on the OP's thread regarding my application, because I do believe it is relative and value adding to the topic....
I very crudely/temporarily attached the barrel to the tank block and tested. Initial results are very promising.
I quickly shot 7 groups. 5 of the 7 had 3 shots in less than an inch. These shots were relatively rapid-fire, without much focus on follow through. Prior to securing the barrel this style of shooting would have resulted in many more fliers.
In summary, I plan to add some method of barrel bad securing the barrel to the tank block.
The challenge will be finding someone to make it, and of course coming up with a design that allows for some variation/adjustment in assembly
Spacebus:
--- Quote from: mackeral5 on March 06, 2023, 07:16:27 PM ---
--- Quote from: rkr on March 06, 2023, 11:10:02 AM ---
--- Quote from: mackeral5 on March 06, 2023, 07:19:27 AM ---
--- Quote from: rkr on March 06, 2023, 03:58:00 AM ---Mike, my experience with long airgun barrels is that you need a tight barrel band for consistent accuracy. The best group with that setup so far is 12.5mm 5 shots at 100M and I did 3 groups under 15mm in that range session.
--- End quote ---
I do appreciate your real world experience. Your. 257 one I often use as a point of reference, a point of measure.
On a short tubed gun such as the brod pictured, do you think a barrel band at the tank block would be worth the effort?
My .25 Gauntlet is setup that way and can shoot accurately. However one must NOT touch the tank, or POI will move. Applying any vertical or lateral pressure to the tank normally results in a POI shift.
The Brod tank/block interface is much more robust than the Gauntlet, perhaps it would not be as sensitive.
I may try to fab up a temp/reversible solution and test.
--- End quote ---
I would give it a go, as said copy Bob's design and if it improves your groups you can then try a more permanent solution. I have my barrel band attached to both air tube and the stock making it extra stiff, perhaps you could try making some sort of extension for the stock that extends under the bottle and ties to the barrel band? It would be a good idea for rested shooting as well.
--- End quote ---
One last post on the OP's thread regarding my application, because I do believe it is relative and value adding to the topic....
I very crudely/temporarily attached the barrel to the tank block and tested. Initial results are very promising.
I quickly shot 7 groups. 5 of the 7 had 3 shots in less than an inch. These shots were relatively rapid-fire, without much focus on follow through. Prior to securing the barrel this style of shooting would have resulted in many more fliers.
In summary, I plan to add some method of barrel bad securing the barrel to the tank block.
The challenge will be finding someone to make it, and of course coming up with a design that allows for some variation/adjustment in assembly
--- End quote ---
I'm trying to figure out a lightweight shim material for taking up the slack between my barrel and bottle and then using some kind of worm gear clamp. Not the prettiest, but certainly effective. After I paly around with a few different designs I am going to try and have something 3d printed or machined.
rsterne:
I had a spacer 3D printed for my dual tank benchrest gun....
I will be using a worn-drive hose clamp to hold everything rigid and aligned....
Bob
Spacebus:
--- Quote from: rsterne on March 07, 2023, 01:07:03 PM ---I had a spacer 3D printed for my dual tank benchrest gun....
I will be using a worn-drive hose clamp to hold everything rigid and aligned....
Bob
--- End quote ---
I like the way your gun is coming together with the high rigidity. I was thinking about using a piece of wood shaped to the barrel and bottle for my gun and eventually getting a 3d printed piece. It shouldn't be too bad to make it out of wood for my Al bottle since it has a flat bottom. I'm hoping to be able to put the whole gun in tension using the CF tube and barrel and clamp it all down At this point I'm getting pretty close to $600 invested into the platform over the last few years, but it's been worth it for the experience. If my CF tube plan works then it will be pretty unique as well. After I get all the parts together and get the concept functional I'd like to work with a machinist to make some poppets and maybe a better flowing valve, or at least flow match the ports with bore.
WhatUPSbox?:
I'm not sure the carbon tube approach addresses the barrel getting bumped issue. Maybe a barrel band that is two separate clamps where you can bond the lower section to the tube. Conceptually something like this design.
https://www.aliexpress.us/item/2251832761554550.html
Of course you could go the airbag route and wrap a pool noodle around the barrel. ;D
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