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Appreciation post: my $200 custom graphite paddle snapped during a big piece last Friday, and a local artist showed me a way to reinforce my next one with a steel core.
I was shaping a heavy 24-inch vase when it gave out, but now I'm wondering if anyone has a good source for small-diameter steel rod that won't react with the hot graphite.
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the_tyler6mo ago
Honestly, the thermal expansion mismatch between steel and graphite has me worried. That steel core is going to heat up and expand at a totally different rate than the graphite shell when you're working with hot glass. I've seen that kind of stress crack a paddle from the inside out. Maybe look into a high-temp ceramic adhesive to bond them, or even consider a mullite rod instead if you can find one. It handles the heat shock way better.
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leerobinson5mo ago
Why would anyone even try that combo? Graphite and steel expand at totally different rates when they get hot. The stress from that mismatch will absolutely wreck the paddle over time. A ceramic glue might help a bit, but it's still a bad design choice. You're better off using a single material that can handle the heat.
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