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1" musket with 4" valve

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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1" musket with 4" valve

Unread postAuthor: Icon E » Mon May 14, 2007 10:44 pm

Musket Specs:

Barrel: 1" bore x 34" length
Chamber: 4" ID x 15" lenght
Piston: 4" ID (3" Pipe Cap)
Pilot for piston: Rainbird CP-100
Pilot for sprinkler valve: Heavily bored Husky(Home Depot) Blowgun
Paint: TBD
Sights: TBD

The goal of this project was to build an easily portable carbine with greater power than one using a single 1" sprinkler valve. Also, all parts must be obtainable locally (mid atlantic USA!).

I put this gun together in 2 evenings with no formal plans. I haven't decided on a paint scheme as of yet so I am sure to get flamed for the messy purple primer. I fill it with regulated pressurized air, so I did not install a pressure gauge. At 70psi and up, the report causes moderate ringing of the ears. I have put over 250 rounds through this gun, mostly segments of 1" dowel.

Any comments or ideas are welcome, thanks for viewing.
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Attachments
Piston_face.jpg
Piston front (1/4" rubber glued in place and secured with 3"cell-core pipe for weight reduction)
Piston_face.jpg (37.01 KiB) Viewed 1537 times
Piston_side.jpg
Piston side (notice the small equilibrium port)
Piston_side.jpg (29.75 KiB) Viewed 1537 times
plug_back.jpg
Plug back (3" cap with a trimmed flush bushing glued inside)
plug_back.jpg (35.45 KiB) Viewed 1537 times
Plug_front.jpg
Plug front (the o-rings are hoover vacuum cleaner belts)
Plug_front.jpg (36.89 KiB) Viewed 1537 times
Rifle_back.jpg
The back end
Rifle_front.jpg
The front end (the bushing was glued into the reducer from the inside)
Rifle_front.jpg (36.15 KiB) Viewed 1537 times
Rifle_side.jpg
Side view
Rifle_side.jpg (31.13 KiB) Viewed 1537 times
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Unread postAuthor: noname » Mon May 14, 2007 10:50 pm

Very nice gun, I love all the flush bushings and the clean primer job. You do have DWV fitting(s) on it though, so I wouldn't use it above 60 psi.
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Unread postAuthor: A-98 » Mon May 14, 2007 10:58 pm

uh, what primer stains? :D

very good work, better than any of my piston guns , oh, wait, i only have 1 piston gun, and it fits inside a pen.

do you have a lathe?, if not, how did you do the o-rings?
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Unread postAuthor: SpudMonster » Tue May 15, 2007 12:14 am

I don't see ANY primer on that, unless you're worried about getting flamed for the primer on the piston...
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Unread postAuthor: experament-u2 » Tue May 15, 2007 1:29 am

that is a really nice clean gun
i would have preferred it as a pocked coaxial well maby not pocked but a shorter barrel one :D

great gun and nice and clean
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Unread postAuthor: TwitchTheAussie » Tue May 15, 2007 1:40 am

Very nice take my honourary thumbs up. :thumbright:
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Unread postAuthor: jackssmirkingrevenge » Tue May 15, 2007 1:57 am

very nicely done - if I could make one suggestion, I would have gone with a longer, thinner chamber of the same volume - that way, you would have had a smaller diameter piston, therefore less pilot volume and you could have piloted it simply with a blowgun.

go on, show us some damage shots/videos :D
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Unread postAuthor: Icon E » Tue May 15, 2007 7:16 pm

You do have DWV fitting(s) on it though, so I wouldn't use it above 60 psi.


If you are referring to the bell reducer, under it is a 3" coupling with flush bushings glued inside the 4" dia pipe. It fit together very tight. Also I filled the space between the internal reducer and the bell reducer with epoxy so the bell is really more of a dress collar[/quote]
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Unread postAuthor: spudthug » Tue May 15, 2007 8:21 pm

oo i see waht u did.. this is a nice gun! i like it.. i want to build a coaxial so bad... im not going to though... i build to many guns.. i just posted two today nad im already working on another and making plans for a hybrid after that..wow this summer is going to be busy..
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: joannaardway » Wed May 16, 2007 6:08 am

There is certainly no problem with the primer there... that is possibly some of the neatest primer application I have ever seen (excepting the internal parts, but those are not a big problem appearance wise), and it actually stands up in appearance to cannons using clear primer.

Fantastic cannon, I don;t see stuff this good everyday.
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Unread postAuthor: Icon E » Wed May 16, 2007 8:02 pm

do you have a lathe?, if not, how did you do the o-rings?


I turned the groves for the o-rings on a table saw. I set the saw to the depth needed, put the flat end to the fence, and rotated the piece by hand. I have used this trick many times, even just to cleanly cut 4" pipe (my chop saw's only 12" so it just doesn't clear).

Today I machined a weaver type mount from a 1" coupling so I can mount an old bb gun laser sight I had lying around. Tomorrow, I am making some ammo from 3/4" black iron pipe by cutting 1"-2" lengths and filling them with molten lead. I should be able to update with new pics and damage shots this weekend.

I appreciate the complements.[/quote]
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Unread postAuthor: ShowNoMercy » Thu May 17, 2007 6:34 am

Thats a really nice gun. I really like it. Was it a pain to construct?
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Unread postAuthor: Icon E » Wed May 30, 2007 8:06 pm

The projectile, and the damage... The CD drive was just sat up on end; when struck, it flew up and back about 5-6 feet.
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Attachments
CDW_3.jpg
CDW3
CDW_3.jpg (31.49 KiB) Viewed 1301 times
CDW_2.jpg
CDW2
CDW_1.jpg
CDW1
CDW_1.jpg (37.3 KiB) Viewed 1301 times
Slug_2.jpg
Slug2
Slug_1.jpg
Slug1
Slug_1.jpg (32.31 KiB) Viewed 1301 times
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Unread postAuthor: jackssmirkingrevenge » Wed May 30, 2007 10:53 pm

Sweet... though for sheet metal, I find that some sort of stabilised dart in a sabot works best.
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