Air Splitter & Barrel Tuners for Air Rifle Benchrest by Carl Boswell
A few of my sketches...
place a weight system on the exterior of the tube. This weight can be moved along the tube adjusting mass distribution.
This is really just a simple version of the more complex Harrell type tuners that use a set rotational movement with a vernier-like scale. My own design slides and locks into place using machine screws with a nylon base to protect the tube. Simple - as it is a prototype that I have played with for quite some time.
Now, weight is the factor. This is where you have to experiment for yourself - with the relatively thin barrels we find on air-rifles, the weight might be excessive. The easiest way to do this is by using large washers and building these up in sections until you get the appropriate weight for any given barrel. This was my own first attempt, buying 22mm I/D washers and fixing these together with long machine screws. Using these washers obviates the need for a workshop to
make the weight – you just need a drill.
When experimenting, do consider the overall length and diameter of your barrel. From limited experiments with only a few barrels, I would suggest shorter barrels need less weight and thinner barrels need more. This will depend on your barrel so unfortunately no formula at present! What we really need is someone with excess time, money and equipment to experiment. My own limited experiments have taken me twenty-two months so far, as I certainly don’t have much time or the workshop with test equipment. If I do need any custom parts, these are made up by a friendly machinist.
At this point, I would comment that it is my belief and it is only a belief, that a barrel is far better off completely free floating without barrel bands or any contact to achieve best results with this system. Much
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