Hi,
I am finally catching up with this important project. It will be my focus now until it is done. It is a challenging one as you will see. Anyway, I made the ramrod pipes. With the long barrel this gun has 5 pipes. They are all octagon with decorative collars at each end. You cannot buy commercial pipes the right size so I had to make the suite. I used 0.04" thick sheet brass and a cast 3/8" fowler rear pipe I bought from TOW.
The pipes get smaller in diameter toward the rear accommodating a tapered ramrod. So the first pipe is 3/8" inside diameter, the second is 21/64" and so on until the rear pipe is 5/16" inside diameter. Simply multiply the desired diameter by Pi and then add double the height of the vertical tabs to get the long dimension for the sheet brass. The pipes are all 1.0625" in length so that establishes the other dimension. Then I just cut the rectangle out with metal shears.
Once cut out, I square the edges and anneal the brass. Then I bend the tabs.
I anneal the brass again and then sand and clean the inside of the tabs so they can be soldered. Then I press and tap the proper diameter drill into the sheet to form the pipe. When almost closed, I squeeze it in the vice using the drill as a mandrel.
Next, I drip flux between the tabs and lay on a strip of solder and sweat it into the joint.
Pipes don't have to be soldered but it keeps them tightly closed as I work on them. All of the pipes are octagon with decorative round collars at the ends. Some careful filing with flat and triangular files is all that is needed. I don't mark things out or use any jigs. I just file by eye.
The pipe in the photos is the rear pipe and it has a filed extension to the rear to attach the tang. I cut the tang off a 3/8" cast fowler pipe. The pipe itself does not go to waste because I can use it as a forward pipe on another gun on which I want 3/8" diameter round pipes.
The round collar on the tang slips nicely over the rear extension on the 5/16" diameter sheet brass pipe and is soldered in place.
It is a very strong attachment and I clean up the pipe and file the tang to the shape and size I require.
I finish up the pipes with files, stones, and sandpaper and I have a nice suite of 5 pipes for the Hawk fowler that match the original gun pretty closely. They will be polished up a bit more later but for now they are ready for inletting.
This is a challenging project because almost all of the components have to be fabricated from scratch or by greatly modifying commercial products.
dave