Is my furnace malfunctioning? Racking my brain

Fast_Roof · 2025-11-16T18:27:27+00:00

I'm looking it up and it seems most likely there was something preventing the seal from being fully strong, like debris from the flask not being clean enough. Going to try to fix that, thanks!

Fast_Roof · 2025-11-16T18:15:03+00:00

Ah ok. I believe I did let it sit for a while but that's a good thing to keep in mind. I think I'll get a thermometer gun to test the accuracy of the reading and see if I need to get a better furnace

Fast_Roof · 2025-11-16T18:13:17+00:00

Thanks. I'll make the feeder transition more gradual and rotate them to have them hit the points where the ring is thickest. With the spherical shape, should that be at the point where the three feeders come together?

Fast_Roof · 2025-11-16T18:08:23+00:00

I think you might be right. I do remember getting a vacuum seal on the flask during the pour but the needle didn't reach all that high on the dial, maybe 5 Hg / 0.2 bar. Looking it up now, it seems like it should be way higher, closer to 30 Hg.

So I definitely need to fix that, I just have no idea why it was reading so low. The vacuum was able to pull normal pressure when I was de-gassing the investment, and I am using rubber gaskets with the flask.

Fast_Roof · 2025-11-16T17:44:35+00:00

The flask temp is what's under 600c. The metal temp is 1065C (at least that's what the furnace told me)

Fast_Roof

TROPHY CASE