The piece of gun barrel is about six inches long. The cutting end is square, perpendicular to the bore. I turn it by hand with a split ramrod in the vise. The cutting teeth are deliberately asymmetrical so that it does not chatter, and I use a file to cut off the shavings in short intervals and then introduce the cutter for the next section. As I pointed out earlier, the tool was shown to me by Hacker Martin about 1960 or '61. I have used a brace and turned the rod, but when the rod stock was considerable bowed, as this one was, that's hard to keep centered. Making split-out ramrods is a lot of work any way you go about it!
The tool is, as some pointed out, similar to the 18th-century screw mills that have a tang to hold in the vise. In 1983, Colonial Williamsburg received a gift of many gunsmiths' tools from Martin Redding. I went out to California and spent a day with him, picking examples for our museum collection, among hundreds of examples. There were also unfinished die-shaped lock parts, screws, etc., for gun making. I was curator of furniture and arms then. Many early rifles illustrate the use of screw mills, and they are often mistaken for lathe-turned examples.
If Dennis does not have the thimble sequence, we will send it again. I intend to submit a sequence shortly on making the rivet for the nose cap on the brass barrel rifle, and I hope that Jim Wright will be able to send pictures of the finished rifle. I delivered it on Friday, the thirteenth of December, at the full moon.
Thanks for your interest. It's enjoyable to follow through on a rifle I'm making. Thanks to Liza, my wife, for sending photos to Dennis, and to Dennis for for kindly posting them for us.
The original brass barrel rifle is dated 1771 by the maker. The patch box ("box") latch was not for ready access. It's basically a lock-down latch that has very little movement. It has never had a kick-open spring; it served the function more like a wooden box. It is transitional in evolution of what later became the patch box. The second rifle from the same shop has a push-button release with a kick-out spring. Clearly, the construction of the push-button latch is not conventional, but shows that he had received an order for it and "invented" the system. The patch box was undergoing evolution in many different areas at the time; it illustrates that the utility of the kick-open spring patch box spread through the back country, resulting in numerous mechanisms to achieve the same result. This is the first time we've had two examples from the same shop to illustrate this evolution that was happening throughout the rifle making areas of Virginia, Maryland, and Pennsylvania.
W.B.G.