By H-O scale, I am guessing you are refering to model trains. That's what I work in. R-C can be cars, aircraft, or boats. I have a little experience with aircraft, having helped a builder with a home-built. 12 in=1 ft, not a model. Didn't help with construction, just specialty tooling. R-C cars I have never messed with, they didn't strike my fancy. But I have used a lot of the parts for other contraptions. I work with stuff other than trains, usually as a "one off" or prototype. Whatever strikes my fancy at the time. . . In years long past (and preferably forgotten) I built electric powered boats, some to fairly large scale. But that was in the late '60s and early '70s, when I was attached to a Coast Guard icebreaker. Something to tinker with when we were at sea extended. Haven't done anything since.
For trains, I use a Horrible Fright press brake/shear, the small one about 10 in length. Had a larger 3 in 1 but it was too big. I have "made" fingers for that small press, not very complicated and didn't use any "machines", just a grinder. Never had to make any female dies, it's just a piece of keystock if I ever needed one.
The material I work with is brass "shim-stock", 6 in wide by 12 or 15 feet long. I stumbled onto some cheap a few years back in .003 and .013 thicknesses so bought up all I could afford at the time.
"Slip Roll" machines I have finagled on occasion. The 3 in 1 had a slip roll but it couldn't handle small, model sized stuff. I usually just bend the shim stock around a small shaft and then straighten the fingers after. There are several small machines on the market for modelers. I would start by looking at "Micro-Mark",
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Page 34 and 35 of the current catalog. They have a good selection of tooling. And a few "over priced" electrically powered "toys". I won't call them machines, just some marketing man's idea of what a small power tool would look like. I have bought from them for many years, but when they jumped on the Chinese miniature machine band wagon, I sorta stood back. They do have some good tooling, you just have to look closely at what they offer and determine if you really need it or can make it instead..
One thing to consider about slip rolls is the length of the rolls. I could build one from small stainless tubing that would handle diameters to .300 in.
In theory. . .
In theory, theory and practice are the same. In practice, that's not always the case. In practice, once the .300 diameter tubes got beyond 4 or 5 inches, there would be a lot of flexing. That's why I just use a nail or shaft of slightly smaller diameter than desired and a piece of soft wood as a pressure plate.
As far as your original post is concerned, the question(s) are a little open ended. I would need a little more detail to be of any useful assistance. Be glad to help, but it mostly would be from a wheelchair now. So, a lot of "theory" and not that much "practice".
Bill Hudson