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  Topic Review (Newest First)
05-03-2019 12:56 PM
carbineone1964 Yes I built a "laminated" DOM tube once. It did not really look too bad after some Lathe profiling. I made it after a Parrot style barrel..


I will post a pic if I can still find it.
05-03-2019 11:31 AM
machine tom Dog, you mentioned a Napoleon 1857, it is a great looking cannon. My avatar is an 1857. You are on the right track of design, but lack the profile will always look like an O2 bottle that makes noise. One of the difficult things with a cannon is the deep boring needed. You can purchase cored 4140 steel 4" d with a 1.5 cored hole, then plug the end at the cascabel, and have the barrel profiled.

If you intend to leave the cannon out in the weather be sure to fit a plug to keep out rain and other things.
04-12-2019 07:04 AM
double d Now you are getting the idea. It would be a better idea if the chamber and barrel were all one dimater full length. Reduced or howitzer chambers present loading issues.

A long cylinder of seamless tubing tubing with a breech plug shrunk or sweated in place would much better. Look up the NSSA breech plug.

If you have the Lathe capabilities, a turned barrel would be a better option. But the way you are proceeding will work.
04-11-2019 07:47 PM
Dogwreck Is this doable? With all the materials figured here its only going to weigh 150 pounds. I also am wondering if the powder chamber is appropriate size but with the 7" bottle I cant go much bigger in diameter? What do you guys think?
04-11-2019 09:24 AM
Dogwreck For the carriage I have given thought. I have looked at recoil and such. I know it will be heavy. I have more experience with wood than I do barrel making and powder chamber fab. If it ends up being too heavy I may go with all steel carriage. I have a 5x10 CNC plasma table and a 4x8 router CNC to help me with the build. I am just really concerned with the Chamber and the barrel because I have never done it.
04-11-2019 07:24 AM
double d
Quote:
Originally Posted by Dogwreck View Post
Thanks again for the advice. I really don't like the mortars, I want a traditional looking cannon with wheels and all. If you could answer some questions that would be much appreciated.

1- So for a cannon, the barrel and chamber should be one piece?
Yes preferred, but you can still use your pressure bottle and do it.

Quote:
2- Could it be 2 pieces , say the chamber machined to attach to the barrel?

3- Or could I have a chamber machined that would fit in a thick DOM barrel?
Yes, look at my drawing again. The drawing is for a mortar, but you can adapt that and make a cannon. Make the chamber section the same length as the interior of the pressure bottle-basically a cannon within a cannon..


Quote:
4- On your suggestion for a cannon, how would you connect the back of the camber to the tank? Would you machine threads in the back of the chamber then attach with a ball hitch?
Cut off the threaded neck and extend the back of the chamber section out the back of the barrel and weld it in place. Weld a trailer hitch ball to the end.

Quote:
5- Also you say just cut a piece of flat to attach the barrel muzzle to the tank muzzle, there is no need to fill the area between the tank and the barrel?
Not really, but I would probably would fill it with packed sand.


Quote:
6- You say the camber thickness outside is 3 times the chamber diameter , is there any suggestions how it should be machined where it meets the barrel if it could be made separate? Should it be Y ed out like a funnel like this <0 ? Are the mortar chambers like that and the bowling ball just sits on the chamber? I am trying to wrap my head around the powder chamber. I am pretty good at mechanical stuff but the chamber is new to me and I feel it needs respect.
Go to the Construction Sticky and follow the link to the NSSA rules for construction of a barrel liner.

Quote:
Thanks for the time answering me. I want a cannon so bad...hahaha!
The barrel is the easy part, have you given any consideration to the carriage design.
04-11-2019 02:18 AM
GGaskill You say the chamber thickness outside is 3 times the chamber diameter...


Outside diameter of the chamber piece needs to be three times the inside diameter, for example, a 1" bore chamber would need to be 3" outside diameter. This makes the wall thickness equal to the inside diameter.


Or could I have a chamber machined that would fit in a thick DOM barrel?


This would be possible and the DOM would not have to be especially thick as the chamber piece would be taking the maximum pressure. You could thread the outside of the chamber piece and the inside of the DOM and screw them together. However, DOM is not the best choice for a barrel as all the DOM I have found has a welded seam which has the potential for fouling to penetrate the seam and cause corrosion. A better choice than DOM is seamless tubing. Its downside is the the bore is not quite so round as DOM.


Another downside of this style of construction is that your cannon is going to be cylindrical instead of the typically taper shape of most cannon barrels. This usually does not concern the first time cannon builder, but as experience is gained, most constructors want their cannon to resemble real ones.
04-10-2019 08:59 PM
Dogwreck
Quote:
Originally Posted by double d View Post
We are about building cannons here, but we only do it one way, the right way. There is a sticky at the top of the board about cannon construction. Read that. Follow those guidelines to make your cannon. We do not differentiate between a blank fire cannon and a projectile firing cannon. Two reasons. First pressure. Pressure is what makes the loud bang of a blank round and pressure is what makes the ball fly. If you don't build the gun right, pressure can get you. The second reason we don't differentiate is human nature. If you build a "noise maker" sooner or later someone is going to stick a ball in the bore, like I said, human nature. You should especially concerned if you park your cannon by your flag pole. Some Prankster or thief may come along and create a disaster.

Your Idea is doable, but just not the way you are suggesting. Bowling ball mortars are often made with an old Argon bottle.

Here is drawing for making a chamber for a Mortar.



The outer diameter of the chamber piece is three times the diameter of the chamber. For a cannon you just make a longer barrel/chamber, full length of pressure bottle.

You can make a round plate the diameter of the bottle with a hole in the middle for the barrel to cover the muzzle. Get some pipe, inside diameter of the outside diameter of the pressure bottle. Cut off a 1 inch section of the pipe and weld it on the muzzle to make fake reinforcing band. Cut another section 4 to 6 inches long and weld it on the back of the barrel to look like a breech ring. Use a trailer hitch ball for a knob. Trunnion should the same diameter and length as your bore.

Take a look at our sticky on making blank rounds. We suggest flour as a filler. Things like grass clippings, wet newspaper and bread tend to fly out like solid projectiles. Dry newspaper starts fires.

Good luck. Post pictures as you build and we will help you. We may be rather frank about some things but it will always if you are compromising safety.

Take your time ask for help, we will gladly give. You will find you will get several different ideas from different people on how do something, that is good. It gives you something to think about.

Did I say ask questions. A saying I use to use a lot back in my working days, was the only dumb question, is the one you don't ask. So ask questions.

Thanks again for the advice. I really don't like the mortars, I want a traditional looking cannon with wheels and all. If you could answer some questions that would be much appreciated.

1- So for a cannon, the barrel and chamber should be one piece?

2- Could it be 2 pieces , say the chamber machined to attach to the barrel?

3- Or could I have a chamber machined that would fit in a thick DOM barrel?

4- On your suggestion for a cannon, how would you connect the back of the camber to the tank? Would you machine threads in the back of the chamber then attach with a ball hitch?

5- Also you say just cut a piece of flat to attach the barrel muzzle to the tank muzzle, there is no need to fill the area between the tank and the barrel?


6- You say the camber thickness outside is 3 times the chamber diameter , is there any suggestions how it should be machined where it meets the barrel if it could be made separate? Should it be Y ed out like a funnel like this <0 ? Are the mortar chambers like that and the bowling ball just sits on the chamber? I am trying to wrap my head around the powder chamber. I am pretty good at mechanical stuff but the chamber is new to me and I feel it needs respect.

Thanks for the time answering me. I want a cannon so bad...hahaha!
04-07-2019 02:41 PM
boomerralph Google military mortar simulators...the military uses them for training using propane for noise.
04-07-2019 10:24 AM
Dogwreck Thanks for the excellent advice. Things I never thought of that's why I asked. I really do appreciate the help. I been reading everything I can about cannons from old history to these forums and really enjoy what I'm reading. I live near Sacremento Ky and they have a reenactment there sometime in early spring. I dont know if they shoot cannons but I am gonna go there this year and check it out. Thanks so much for the response again.
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