Once I am certain the concept is sound, I will draw up some instructions on how to make them. Unlike most of the rest of what I have made, this part of it can be made on a drill press, if one is patient and takes their time. these currently feed BB and 3/16" bearings
Cool Greg. Great to se an idea taking physical form. It appears you went about it a bit different from the way I originally hatd it picturred, with the way the parts are bolted together, but I am betting that made addembly easier so I can see that. Plus it would eliminate machining the assembly slot in the bottom. I note that you also set ift of independent barrel depression with separate knuckles. Very interesting. Let us know how it works in thesting and any tips you learned in building it. Great job. BTW, if you are interested in your pump design going into production, you might want to chat with Stepnen over at Strike Models. Good people over there. Thanks for the heads' up, by the way. Cheers,
and actually, unlike what we talked about, there is no seal needed where the barrels pivot due to the geometry of the mating parts.
So what is the taper I'm seeing in the barrel? Is that where you turned it down or a smaller barrel inside a larger barrel? How 'bout taking some photos of it taken apart? Looks to be a direct replacement for the barrels on my cannons... I'll take 4, govn'r!
the turned down section is because I didn't have any tubing the correct diameter. so I made it correct.
groovy. So the rest of that tube is thicker than what a .177 would need to seal? I think I have some .177-compliant tube if you want some.
I think you are misunderstanding. I will take a picture tonight. The rest of the tube is standard 1/4" od, ~.190" ID. the seal is in the pocket for the pivot.
More pictures of the guts. in retrospect, I can forgoe the channel in the sphere in favor of just a tapered inlet, that will make machining them more difficult (now I have to have a tool change) but will remove necessity to align barrels properly. I also need to add an alignment feature to the O-ring compression area (probably a pin of some form, we will see)
Great pics. As I am now seeing it, perhaps the ball knuckles are a better choice for easy machining and for the O-ring breech than the horizontal cylindrical knuckle I was thinking of to gang the barrels together. Turns out, with the balls, it is now kind of like a horizontal version of the earlier Small/Fast Gun single barrel traverse and depression joint I saw years ago that inspired the cylindrical knuckle depression joint in the first place. If I get the chance to find it again, I will post a link to the article. I really look forward to the test results. Cheers,
the big difference here, should be, that since teh ball is downstream from the O-ring, it will not have to seal perfectly, since it only sees high pressure for a tiny fraction of a second as the bearing moves through it after being stopped by the O-ring. down side is that it will wear out sooner.
1) As for the sealing, I had thought we had talked about doing this downstream of the O-ring so as to not need the tight seal, but perhaps I am mis-rembering or mis-communicated, or both. Both are liikely in my case. 2) A couple of things the cylinder style knuckle handle is that It does gang the barrels, so moving one moves all The barrels cannot be rotated and set up to bind You could depress by rotating the cylinder knuckle with a servo directly mounted to the rotation axis or ith a lever wherever you want Of course, a cylindrical knuckle would require fairly precise spacing, and the machining setup would be different and perhaps a bit more difficult, even with you CNC setup. Cheers,
yep. I went away from the cylindrical because of tooling requirements. with the sphere, I can buy the spheres, premade, and a ball end mill of the same diameter and make the pocket. we will see if it was the right choice.
Here is a quick, poor quality video of the karsruhe's completed turret. Total weight is ~7-8 oz the same as two of the BC guns it is replacing. I need to modify the turret for greater depression in future versions, but since this is a stern gun, that much is not needed here.
I just watched the video you posted. Let me get this straight... you want MORE depression than that? Wow. That's already as much as most Big Gun ships I've seen.
I suppose I should have specified, the mod is so that the top of the turret sits flush at the high depression, not sticking its butt into the air, like shown on the video.
