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Stand for long cannon.

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Stand for long cannon.

Unread postAuthor: SpudFarm » Wed Dec 08, 2010 4:40 pm

Hello Spudfiles, I have wanted to build a stand for my hybrid since the first time I fired it. But it's hard to bite over something like that all by yourself.

Today I got one step closer though, my father showed interest in getting the cannon a stand. It's not certain, but if I can get up with a doable and not entierly unrealistic design I think it might have a chance to get built.

The starting point of this would be a table that we previously used to dyno-run snowmobile engines. We have almost stopped doing that now so it is going to act as the foundation for the entire thing.
I have not had time to take meassurements of the table but the pictures should give you an ide accurate enough to throw ideas at me.

I am imagining the cannon being bolted to a hinge (Some beefy door hinges should work) for elevation and a ball bearing assembly of some sort for vintage, possibly something from a snowmobile or a car.
The cannon is probably going to be attached to the hinge setup about 2m from the chamber via the barrel and welding.
Then I will make a barrel support that I don't need help with so don't think about that.

Extending from the barrel I am imagining three steel tubes that holds the chamber in place during disk change. That way I just have to unscrew the union and pull the chamber back to insert a new disk.

My vision on this is very rough as I have been planning it for about half an hour so any input and ideas are welcome.

Image

Image

As you all know to well, I am one of those that gets ideas and they just die out. But this will be a long term project that I just have to get started with and it will evolve from the starting point.

The only requirements is that I have to be able to aim it and fire it from a supported position so I can feel the recoil and have control over the cannon.

I will be collecting your input and TRY to draw a diagram of the stand. Try to keep it simple :)
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Unread postAuthor: Technician1002 » Wed Dec 08, 2010 5:24 pm

If you take the front end from a bicycle and weld it upside down to the table, the forks for the front wheel will have a nice swivel base. The handlebars should be cut down to a post of course.

i've been planning on that type of swivel base stand for a future cannon. Instead of a table, it would have a pipe tripod.
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Last edited by Technician1002 on Wed Dec 08, 2010 6:37 pm, edited 1 time in total.
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Unread postAuthor: SpudFarm » Wed Dec 08, 2010 6:04 pm

Now that's a good idea! I might go with this. Not sure if it can handle 20.000joules of recoil energy (Potentially) though.
That idea will be in heavy consideration, thanks :)

Edit: I might mount a compressor underneath the table. Just so you don't use that space in your plans.
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Unread postAuthor: ramses » Wed Dec 08, 2010 7:53 pm

re-do that recoil energy calculation; momentum is conserved, not energy.

I would be cautions welding on a hybrid chamber, depending on its composition; metal derives quite a bit of tensile strength through cold working, and hot working removes this.

dynoing snowmobile engines? what did you use as a load?
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Unread postAuthor: Moonbogg » Thu Dec 09, 2010 2:49 am

ramses wrote:I would be cautions welding on a hybrid chamber, depending on its composition; metal derives quite a bit of tensile strength through cold working, and hot working removes this.



i second that. If the cannon works as it is, I wouldn't modify it in such a way as to weld onto the chamber. Perhaps consider using clamps or something to secure it rather than weld to the cannon itself.
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Unread postAuthor: SpudFarm » Sat Dec 11, 2010 11:26 pm

Who told you I would weld on the chamber?

And if I was going to do that it wouldnt matter as the endplates is welded in place and it holds up like a charm.
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