As if I don't have enough projects, I had to go and browse this board and see the little micro-mini mortars. Here's a pic of my first one in .177. It's not a scale replica of anything, just kinda made it out of some 3/4" brass (pretty sure it's Alloy 360.) Still needs polished, trunions installed and flash hole drilled (1/16"). Not sure what kind of base I'll do, but it will be something metal - I'm not much on woodworking!
I've never really messed with blackpowder, but I have built golf ball launchers, machine gun simulators, air cannons and the like. I'm no stranger to firearms and reloading (smokeless).
Here are my questions -
What kind of powder and how much to start with? I can't imagine even getting enough powder into this thing to blow it up!
For the brass coehorns, how are you attaching the trunions? Are they pressed in or brazed or soldered?
I've seen reference to using a hot wire for ignition instead of a fuse. How does that work? Would it be feasible to run a piece of Nichrome wire into it and use a battery for ignition?
The next project is going to be either a bowling ball mortar, or preferably a bowling pin mortar - I can get pins easier than I can get balls! Maybe a soda can mortar as well. We have a machine gun shoot coming up in June and some big boomers would be a nice addition.
Thanks in advance!
Vince
http://bloomautomatic.com/177mortar.jpg (link if the pic doesn't work)