Quest For Gunmetal, Part 2. Progress!

so yeah we're gonna try again here so what I'm gonna do this time I'm gonna make a larger quantity I made up this mold I guess I'll call it it's just a piece of scrap tubing that I had steel and I put a little base on it so that I can pour into it without it falling over and I can preheat that that way when I pour it in it doesn't flash freeze I'll get more of a slow cooling doing a big cannon with a big mass of metal it's gonna cool much slower so I don't know if this will make any difference or not but I'm gonna make more of the gun metal this time I'm gonna make two kilos so when I do my math if anyone wants to check me I need seventeen hundred and sixty grams of copper 180 grams of 1060 grams of zinc to get sixty grams of zinc out of cartridge brass I need 200 grams of brass because it's 30% zinc so it'll be 60 grams of whereas and a hundred and forty of copper I subtract that hundred and forty from this because I only need that total in copper so I need to weigh out sixteen hundred and twenty grams of copper 180 grams of 10 200 grams of brass how many people can actually say they've used tin snips to cut Tim alright so there I've got my ten my brass this is my copper I'm gonna put some draw Singh flux in again all right I just started it up there is the temperature readout and when it's first starting it climbs very rapidly as the hotter it gets the slower that's going to go but on the video I think you're probably going to see it's better you and there we have 2000 degrees right so I'm going to start adding my other bits of copper I'm gonna preheat alright here's the last bit of copper I am gonna go ahead and add the tin alright let's add some brass I'm also gonna add this a little bit of gunmetal I had left over from the last melt alright so here's my setup that's gonna be my first pour that's my my preheated mold what's left I'm gonna pour in here and if there's anything left upward in the muffin tin just to make ingots [Music] but move this bucket out of the way dumbass dug these out of the green sand so here's the results you know it's funny you get doing things and then you you forget stuff if I had weighed this mold here before I poured I could then calculate my yield but I have no way of knowing how much done metal I have in this in this one I'm gonna put it on the lathe and I'm gonna try to turn it down and maybe I'll be able to get to the point where I can peel this case off and then at least get an approximate weight because I would like to know what my yield is here this is a piece of cartridge brass and I don't know if the camera is gonna pick up that color difference just trying different things to get you guys so that you can see the difference in that color so I just cut that down I'll just use a turning tool and try to try to cut the weld I just broke through [Music] that's one way to get it off I guess that's a like bronze scale or whatever inside there I don't see any of the case left I think that's a pretty reasonable approximation in weight by weight out to kilos of raw material so let's see what we get in yield Wow 2 kilos exactly that's almost I mean it can it can tell that little bit of metal oh you know what it is I added that tiny little bit of the leftover gunmetal from last poor say probably around 60 70 grams so this is kind of interesting this is the top where I pour it in so it came down there so this is the area that was on the bottom this was sitting on the concrete so this would have cooled the fastest it's very pitted right there all the way up to like the halfway mark it's very pitted and up here it's definitely smoother so I'm thinking that this area cooled slower but I don't really know why it would be so pitted the inside of that tube was not rough so this is what I'm gonna do I'm gonna make a test sample here and then a test sample here and see if there's any difference and this big chunk I'm gonna take a piece probably from the upper portion of this and we'll is that as well all right here we go so this is the sample I did last time I used to sand mold and a very small pore it didn't do so hot this one I also did a sand mold this time but it was a bigger pore so this does have the potential to do better this was the pre heated metal on the bottom and this was the pre heated metal on the top and my guess is that one is gonna be the strongest if there's any difference at all we are gonna do the green sand sample first so this is green sand casted gunmetal so that's 400 psi boy it broke really quickly so I just finished watching my premiere and Brandon Thank You Brandon pointed out that it might be the way I'm making my samples that this radius here is not adequate and this did break at the at the edge again so using my green sand doing a bigger pore did not help in fact that this one was a little weaker alright next so now I've got the bottom portion of the metal mold so when it gets there it's that's 400 you really don't start seeing anything until 400 got the 500 and broke grain structure might be a little bit finer but I'll look at them side by side but it also broke at the junction I think Brandon's on to something alright well we'll try the last one don't know if this is gonna make any difference in fact I really doubt it's going to 400 600 800 we have 9,000 it was almost at 1,100 there all right so I calculated the PSI of the best sample there which was the top sample from the metal mold it was 20 1,500 psi now the question is why did I get 20 1,500 psi on one of these and I mean I didn't get hardly anything maybe 10,000 on these other two I don't know the answer to that and that actually makes me think again it's the sample because there shouldn't be that much variability unless there's something wrong with my testing procedure the grain structure there is actually a little bit finer this is the one that was the sand even on camera I think you can see that cooling it too quickly is an issue obviously and maybe this is actually stronger than I'm giving it credit for and that would be great boy I sure hope that's that's the case but yep sure enough it broke right at the corner this one broke right at the corner this one broke right at the corner and the one from last video also right at the corner I think Brandon may be on to something basically I need to make my sample with a smoother transition and a nice radius there so that it doesn't give a stress point for it to fracture now interestingly when I use this same method before like this was a piece of an auto part you can see broke right down the middle no issues at the corners but that's aluminum this is a piece of 6061 same thing broke right in the middle no issue so I don't know maybe it's the material I'm gonna need to try this again and use a better method of making a sample we're getting there more work to do thanks for watching [Music] [Applause] [Music] [Applause] [Music] [Applause]

Channel: FarmCraft101

Views: 54,457

Rating: 4.9603958 out of 5

Keywords: melting bronze, melting brass, bronze ingot, brass ingot, melting copper, gunmetal, gunmetal ingot, tensile strength

Id: MOGo-d2MEOI

Length: 13min 22sec (802 seconds)

Published: Fri Dec 14 2018