badbrando wrote:I've cast this type ring with so many different combinations of spruing and burnout method that I just don't believe it's possible without it being wax. I'll just make molds of the resin from now on. I didn't want too but I guess it's a compromise I'll have to make. I'm not good at cutting molds:(. All other rings are perfectly burned out so It's hard to complain I guess..
you don't have to be good at cutting molds although I know it's the preferred method, I use mold locks in the 4 corners of the molds and baby powder in the middle before putting them together for the mold frame.
There will be some minimal cutting. You can also use them for cutting it just makes it easier. just dust to outer sides and the corners where the mold locks are and then you can open it up and cut out the area you need around the ring.
for the rest of the posts they are right. but as I was saying the ring needs to be tilted so the sprue actually comes in at the side of the model but the sprue up the middle is commonly done as well. I do it too I also add small short wax wire on the sides of these smooth surfaces on heavy rings like this to reduce any porosity it helps dissipate the heat evenly I would add at least 4 or 5 on each side but they are right to say the sprue up the middle will help with ash removal especially if you use a Vacuum cleaner to suck out any residual ash from the can before casting. This ring should be no problem to cast.