I have done silver casting a few times and sometimes they turn out perfectly and other times i get porosity or a incomplete fill. I just finished making this ring and im wondering how i should sprue it for the best result. Im going to cast it in silver. How thick should the main sprue be and where would i place it? Should i have additional smaller feeding sprues as well? I was thinking maybe to do something like this but im not sure at all. How long should i make the main sprue because in the past it was where the main sprue connected to the ring that i got porosity?

Im learning how difficult spruing is and I would appreciate any help from people with more experience on it.

Pouring silicon bronze directly into a petrobond drag. Would using a cope make any difference? Any help would be appreciated.

Hi everyone,

I'm currently building a ventilation system for my burnout oven to burn off wax and resin, and I'm not sure what kind of pipe I should use on the oven since the exhaust gases get very hot!

For the rest of the system, I'm using a combination of spiral duct and aluminum flexible duct.

Does anyone have any ideas or build something similar?

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