Got a little bit done today. Milled out the pellet ‘valve’ for V2. It came a bit smaller inside diameter than the feed pipe and it’s bushing. Only needed to mill out .06″, but it was enough that a hammer wouldn’t have worked. Shown below in open and closed positions. This will enable the pellet feed to be shut off. Before, you had to wait until it ran out of pellets, or scoop enough out to plug the tube. Now you just loosen the screw and slide it in. Added set screws to both sides of the valve to be able to secure it to the tubes. Wanted to make the pellet hopper removable, just in case you wanted to take it off for some reason.
I’m thinking about spring loading the pellet valve as well, so it’ll close on it’s own when released. You’d have to wait until the pellets finished falling through it as you push it in, pushing past the pellets. Spring loaded would just close on it’s own as the pellets got out of it’s way. I’ve also got some fusible links that I could use to act as a ‘fuse’ of sorts…to shut it in case something happened and it started a burnback. That hasn’t happened yet, but it might be a nice added protection feature if these ever went to market.
Burnback is when the pellets start burning back up the feed tube. Gravity is supposed to prevent it from happening, but that “other” stove has somehow managed to ignore the whole gravity thing and fill a few homes with smoke. Maybe I should sell him my idea, since he’s so adamant that he wants me to pay him a commission for using ‘his’ design. Yeah…I’m rolling my eyes.
Still have to mill the outside of the air valve. Looks just like the pellet valve, but a 2.5″ one instead of a 3″ one. The fresh air intake pipe diameter, much like the pellet feed tube, is just a bit off on what I need. The outside of the air valve needs taken down to 2.25″. The mill will make short work of it, and the new software will make it all hands off if I program it right.
Almost ran into a problem with the last piece of body welding on V3. I figured that the steel between the front and back panels being 4″ wide, everything would just slide right in to include the flue stub. The 3″ pipe that I use for the stub is 3.5″ diameter….and I knew that would fit, but be tight with only 1/4″ on each side to play with. Then I remembered that I use double layer pipe…and that’s a shade over 3.5″ thick. Going to get tight in there, and I thought it might not work. Welding it was interesting, but it’s all together. Had to run the MIG wire out nearly an inch before it touched the plate. Interesting welding that way. I might have to rethink that if I ever have to make these in bulk. Might be one of the first plates welded, then I can do it from the inside.
Started grinding the edges down…make them all nice and smooth. Going to take a while. Lots of edges to grind, and some need to be done with a hand file or maybe a Dremel. It’s also very loud. Like grinding on a large steel drum. Ear plugs and safety glasses will be a must.
That’s the extent of Saturday. Didn’t get started until noon, and spent more time on the mill learning the new software that I probably should have. Tomorrow is another day, and I’m playing ‘bachelor’ for the next week. Not sure how much will be going on, but if it happens, you’ll see it here.