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Work on spruing. I have bee using acetylene for over 30 years and no problem. Thick castings require bigger spruing.I would google around for info on casting with different fuel sources. Many years ago, when I was still new to this world, we were using acetylene(!!!!) to cast with. It was dirty and we were having miscasts. I started googling and found a father son duo who had a great article about casting with different fuels and found out real quick that acetylene should not be used . We changed over to propane and oxygen. Natural gas should be fine also.
Spruing is the other big concern. Making sure you have big enough reservoir is key. Also keep in mind how your molten metal is flowing. I try to limit the mount of directional changes the flow has to make before it gets to the margins.
Tried Argen recently and the results were really good. I'm trying to keep my hand in it for rushes but otherwise they seem worth it. The time I save is better applied to more CAD design and from what I understand the finishing is way quicker (as in hardly any needed).Why don't you just mill the gold at strategy milling or argen?
Milled gold is the only way to go these days IMO. I see like one every two years. I am amazed you see enough to have a protocol for it.Tried Argen recently and the results were really good. I'm trying to keep my hand in it for rushes but otherwise they seem worth it. The time I save is better applied to more CAD design and from what I understand the finishing is way quicker (as in hardly any needed).
They've had a few hiccups now and again with minor delays but the 2 day turnaround seems pretty consistent.
Try contacting talladium. They have been very helpful over the years with casting issues.So I'm relatively new to casting (only a few years experience) and realizing that I've been getting by alright but when things don't go well (miscast, porosity, investment problems) I don't have a strong foundation in the fundementals to troubleshoot what's going on. I don't really have anyone that can look over my shoulder and point out what I'm doing wrong. I get the sense that I'm doing most things correctly but there's so many variables that sometimes a combination of things adds up to me messing something up. The areas I perceive I'm weakest at are:
Getting my torch set correctly for different alloys
Optimal sprue technique
I'm just wondering if anyone has some resource they can point me at to read up or watch where I will hopefully notice things I am doing sub optimally. Most of what I cast are full gold crowns, with the occasional pfm, custom abutment, or post.
EDIT: I suppose I could also start documenting stuff with photos so we can laugh the next time I mess something up and hopefully figure it out, but for now I'm mostly just looking to read and study something to see if anything jumps out at me.