Not on the furnace at all. Just dip the tip below the slag. I would agree that they are not necessary but they really help if you want to get consistant...
Thanks George and Lyle, You kept me from drilling needless holes in my furnace! I will do some melts first and decide later on if I need a pyrometer or not. ...
Just make sure to preheat the tip in the exhaust flame before dipping it into the melt. LL ... to ... over ... MIFCO ... furnace ... it ... about ... hand ... ...
Hello, No flame from me George but I would like more information. I'm superheating the melt because I have trouble getting the mould to fill completely. I've...
That happens alot. I just poured off 8 molds and two didn't fill completely. Usually it's because it's the first time using that pattern. In my case one was a...
Hi again Joe I went and dug up the old match plate and the first part cast from it so I could photograph it These may make all that jibberish make some kind...
Now I'll attempt answer this question by it's self As Lyle said in his post you need to think about the way it will solidify. Sprues I use are 1" in Diameter...
jpdinges I looked at your photos. nice furnace. Can I make a suggestion? Stop the infiltration of air through the tuyere ( burner port ) all the air that...
... solidify. This is a good place to start. But you also need to think about how the mold will fill with metal. ... so ... freeze ... Not all gating systems...
OK Dave this the second time you said there is ratio and Give the same number 1-4-4 what do these numbers mean and how can a nueby use them right out of the...
OK Dave this the second time you said there is ratio and Give the same number 1-4-4 what do these numbers mean and how can a nuby use them right out of the...
Damn, Your sorta splittin hairs here. Yes, You do need to vent more using a 140 fineness sand as the smaller the grain size the less porous the sand is and...
Ok George I'll explain it's really simple logic. 1 is equal to the cross sectional area of the down sprue. 4 is equal to 4 times the cross sectional area of...
So your ingates are larger than your sprue?! LL ... ingates ... squared ... the ... or ... first ... weight ... looked ... pot ... will ... to ... metal ... an...
Well Dave, I must be one dense engineer because I know how to figure the area of a circle Pi x r 2 = area and the area of a square shape is height x width =...
yes, if make the runners and ingates should be bigger. this will allow the metal to flow into the mold at an even rate, and you'll be able to fill the mold as...
Well George not too sure how to respond. Either I didn't explain it properly or your misunderstanding what I said. Looking at what you wrote I'm assuming you...
But that really messes up directional solidification. You want your sprue to be the largest cross section so it freezes last. Otherwise you'll get a big dimple...
Hi George, Actually I put some of the fibrefrax leftovers into the furnace entry of the burner. I think this setup is the most economical way to heat-up the...
I'm not trying to change the way you do things, if you have something that works by all means use it. I'm just putting out information that was taught to me by...
That very first link contradicts what you first said. But if it works for you... LL ... the ... will ... the ... intent ... from ... fool ... out ... formula ...
I guess you can lead a horse...as the saying goes page 8 paragraph on Gating it talks about both a 1:4:4 ratio and a 1:4:8 ratio for nonferrous and a 1:2:1.5...
I was talking about gating directly into the mold cavity not the ratios. I think you were the one that said that. Right? maybe I'm wrong but someone here said...
Joe, it's my guess that you were pouring too cold the first time. Did you have shrinkage problems the second time when everything filled? It's hard to diagnose...
This quote is from page 3 "In general, the entire path of molten metal, within the gating system as well as the mould cavity, is turbulent in most castings....
Hello, The last lathe bed casting I poured filled properly, but the surface finnish is a little rough, which I'm thinking is becasue of the higher temp. I had...
You shouldn't have to rap the pattern before lifing the cope. I really doubt the surface finish is rough from pouring too hot but it could be. You should be...
Dave, Do you know what the Reynolds number, hydraulic radius, or N factor is? And what they are used for? I do. We're talking home casting here. And I doubt...
Was the shrink around the edges of where the 1/4" hole joined the casting? What is the thickness of the casting where this 1/4" risor was? And is this risor in...
Lyle the internet is really a bad place to have any kind of conversation. The response to George's post was suppost to add info that I feel was left out, the...
