Thread: Miniature cannon build .62 caliber

.62 caliber miniature cannon build. Elm carriage and rimu wheels. Medium tensile hollow bar barrel with a 3/4" unc breech plug.

Nice! When do we get the range report?

Where's the touch hole hiding ?

Originally Posted by Steve123

Nice! When do we get the range report?

I'll try to get it to the range this weekend, and take a video. Few bits to finish first.

Originally Posted by akaroa1

Where's the touch hole hiding ?

Yet to be drilled. Loading tools and cap square keys still to make. I think it needs a rope on the trail too

@Kero what exactly was the medium tensile hollow bar you used ?
Grade, bore, diameter and source ?

I need something like that ti have a try at cut rifling a Brunswick Belted Ball Barrel

In the Easy Steel catalog, under specialty steels, carbon hollow bar, E470 grade from memory.
Rough 14.5mm ID which I bored to 5/8" or .62 caliber. I should've gone slightly bigger, but it's more for a display piece that can also function. I have a couple of bits left that haven't been machined, I'll measure them tonight. The idea was decent wall thicknes, A, to look the part, and B, to provide loads of strength.

I'm really interested in rifling one, but don't really have much idea on doing so. Any info on rifling a 16mm and bigger bore, without costing a fortune, would be much appreciated. FYI, I'm by no means an engineer or machinist, but do have a tame engineer I can call on!

Originally Posted by Kero

In the Easy Steel catalog, under specialty steels, carbon hollow bar, E470 grade from memory.
Rough 14.5mm ID which I bored to 5/8" or .62 caliber. I should've gone slightly bigger, but it's more for a display piece that can also function. I have a couple of bits left that haven't been machined, I'll measure them tonight. The idea was decent wall thicknes, A, to look the part, and B, to provide loads of strength.

I'm really interested in rifling one, but don't really have much idea on doing so. Any info on rifling a 16mm and bigger bore, without costing a fortune, would be much appreciated. FYI, I'm by no means an engineer or machinist, but do have a tame engineer I can call on!

Look into electro etch rifling. It's about the only way I know of that doesn't require a heap of specialized equipment. A basic cut rifling machine could be knocked up if your very handy, but it would be a lot of work and a lot of learning for one barrel.

Electro etching then lapping can produce a rifled bore capable of spin stabilizing a projectile. You won't be winning any trophies with it, but it will spin a bullet. I have never done it myself, but have seen enough online to be convinced it's a legitimate method for a basic rifled barrel.

https://hackaday.com/2017/03/08/diy-...-printed-help/

Originally Posted by SixtyTen

Look into electro etch rifling. It's about the only way I know of that doesn't require a heap of specialized equipment. A basic cut rifling machine could be knocked up if your very handy, but it would be a lot of work and a lot of learning for one barrel.

Electro etching then lapping can produce a rifled bore capable of spin stabilizing a projectile. You won't be winning any trophies with it, but it will spin a bullet. I have never done it myself, but have seen enough online to be convinced it's a legitimate method for a basic rifled barrel.

https://hackaday.com/2017/03/08/diy-...-printed-help/

Interesting! Never heard of that technique before.

https://youtube.com/shorts/F2FBDhaz_...wJuDJD4lN5ZOCP

Fired it today at the range. Goes OK. Not a bad report with 100 grains of BP and a lead ball.

That's very cool and looks very nicely made.

Originally Posted by Kero

In the Easy Steel catalog, under specialty steels, carbon hollow bar, E470 grade from memory.
Rough 14.5mm ID which I bored to 5/8" or .62 caliber. I should've gone slightly bigger, but it's more for a display piece that can also function. I have a couple of bits left that haven't been machined, I'll measure them tonight. The idea was decent wall thicknes, A, to look the part, and B, to provide loads of strength.

I'm really interested in rifling one, but don't really have much idea on doing so. Any info on rifling a 16mm and bigger bore, without costing a fortune, would be much appreciated. FYI, I'm by no means an engineer or machinist, but do have a tame engineer I can call on!

Go onto YT and check out the rifling done in Pakistan (Dara Adam Khel) by some guys in flip flops and a hack saw and drill

Originally Posted by SixtyTen

Look into electro etch rifling. It's about the only way I know of that doesn't require a heap of specialized equipment. A basic cut rifling machine could be knocked up if your very handy, but it would be a lot of work and a lot of learning for one barrel.

Electro etching then lapping can produce a rifled bore capable of spin stabilizing a projectile. You won't be winning any trophies with it, but it will spin a bullet. I have never done it myself, but have seen enough online to be convinced it's a legitimate method for a basic rifled barrel.

https://hackaday.com/2017/03/08/diy-...-printed-help/

There was an old boy on here who modified his lathe to cut rifle a barrel. He did BP rifles, can't remember his forum handle though

Originally Posted by Russian 22.

There was an old boy on here who modified his lathe to cut rifle a barrel. He did BP rifles, can't remember his forum handle though

Homebrew357 from memory, but long gone i think

Originally Posted by akaroa1

Homebrew357 from memory, but long gone i think

https://www.nzhuntingandshooting.co..../homebrew-357/