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First part of my first real build acquired

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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First part of my first real build acquired

Unread postAuthor: Bando_Red » Tue Jul 18, 2017 11:08 pm

A .45 percussion pistol barrel. Measures about 10.5 inches overall, roughly 8 inches muzzle to breech. Haven't measured the bore exactly because I don't have the tools to, but I'm going to buy some .457 and .451 round balls and see how tight the fit is with a patch.

Going to try and maintain a somewhat conventional muzzleloader appearance. Underbarrel metal chamber and a quick dump valve. By going with a comparitively smaller in volume tank and single-shots per fill with higher PSI, I'm hoping to get and 600 FPS at the muzzle and tin can accuracy at 10 yards, but I suspect those both will require a bit of fine tuning. If I can get 400 FPS and onto a pieplate I'll consider it a victory. I've got some wood for a stock/grip, the ram rod materials, and a rifled steel barrel rated for blackpowder pressures and I'm only out 33 US dollars. Got a lot of loose springs and screws and metal bits in the junk drawer for making the various small parts as well. I'd like to get this operating around 70 dollars but I doubt it.

At this point its still on the drawing board and the big hurdles are largely in execution, specifically constructing a metal valve and chamber with only a power drill, files, and hand tools. I'm considering mating the barrel, chamber, and valve into one assemble that I can just drop into a stock with some screws as that seems like it would be simpler than trying to fit the seperate components together with the right tolerances on a seperate piece of metal IE that will also fit into the stock. One thing I'm completely puzzled on and open to suggestions is how to route air into the barrel. The simplest way would seem to be removing the percussion nipple and sending the air directly through the flash channel, though I'm afraid that would be too much stress on the metal as the flash channel is not meant to contain pressure. I could possibly bore it out to a wider diameter and sleeve it to be pressure safe. Otherwise I'll have to mutilate the barrel which I'd like to avoid as much as possible

Pics are the bore and the barrel next to my S&W 10-5 for comparison
barrel1.jpg
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Bando_Red
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Re: First part of my first real build acquired

Unread postAuthor: jackssmirkingrevenge » Thu Jul 20, 2017 4:51 am

Nice looking project! I have some rifled barrels lying around acquired for similar purposes, just haven't have the time to put them to use yet.

specifically constructing a metal valve and chamber with only a power drill, files, and hand tools.


It's not easy but it's possible - standard fittings and epoxy casting can be your friends here.

Don't forget that Technician1002 made his QDV using only a drill press, and recent work by farticox1 and Xamllew on this forum show what can be done with hand tools and a bit of patience.
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Re: First part of my first real build acquired

Unread postAuthor: Bando_Red » Fri Jul 21, 2017 12:42 am

thanks jack, shatterhand was obviously inspiration . Valves are something I'm still struggling to comprehend the mechanics of, but what I'm more worried about is making a chamber that will both compliment the size of the barrel in a handy package while still maintaining enough space insider and strength to be able to launch a lead ball at a reasonable velocity. I was looking at the 9 and 9.5 oz pony bottles, but they seem a bit expensive for what they are. I'm working with about a 3rd grade math level so I'm having trouble calculating what exactly my requirements will look like in terms of numbers and how I'm going to make them a reality. Right now I'm thinking I'll have to make a reservior/chamber out of appropriately rated pipe, most likely DOM Hydraulic tubing.

If I use patched round balls made for muzzleloading firearms, I'm looking at about a 128-140 grain projectile. I'm hoping to reach or crest 100 ft-lbs of muzzle energy, which with those projectiles means just shy of 600 fps. It's been done by others with similarly sized barrels so it should be possible. I'm not sure how active the forum still is, but I'll try to upload my sketches soon for any commentary
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Re: First part of my first real build acquired

Unread postAuthor: jackssmirkingrevenge » Fri Jul 21, 2017 8:35 am

I'm not sure how active the forum still is, but I'll try to upload my sketches soon for any commentary


Not as much as it used to be but you'll get feedback and advice if necessary :)
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