Jay Hertel Posted July 9, 2018 Share Posted July 9, 2018 Getting ready to build a new ribbon burner forge and keep reading about the burners breaking--i could be wrong but wouldn' it be better to make oval shaped burners instead of something that has sharp edges similar to softening the edge of anvil so that don't chip and have stress risers also it could possibly cover more area since ovals have less area then a rectangle would Quote Link to comment Share on other sites More sharing options...
WayneCoeArtistBlacksmith Posted July 9, 2018 Share Posted July 9, 2018 A properly built Ribbon Burner, using the proper castable should not have problems with breakage. Stress risers occur at inside corners. Let me know if I can help you. Wayne Coe Quote Link to comment Share on other sites More sharing options...
Latticino Posted July 9, 2018 Share Posted July 9, 2018 Wayne, I had a ribbon burner that was manufactured, cast, and carefully preheated before firing. It was made of Mizzou using the John Emmerling plans you have on your website. Worked well till I cracked it in half, right at the joint where the front of the tube opening meets the castable. Probably due to operator error in moving it around, but I'm going to change my next one by fully cutting off one side of the steel rectangular tube, so there is no sharp edge of steel in the middle of the casting. I plan on welding on a short section of ~3/16 rod to the front edge of the short end caps to retain the castable to the burner, hopefully without stress risers. In my experience casting refractory doors this works very well. I may also switch to drilling the burner ports for more accuracy there as another has posted. Quote Link to comment Share on other sites More sharing options...
Jay Hertel Posted July 9, 2018 Author Share Posted July 9, 2018 Thanks for the insight still just duing the home work before doing the spending-- the last forge I built was just a n/a reil burner that was fully machined was awsome but as all awsome thing ended up missing been a few years since I've swung a hammer I'll keep ya posted Quote Link to comment Share on other sites More sharing options...
Frosty Posted July 9, 2018 Share Posted July 9, 2018 I read about what you're describing Latticino and applied a little of my materials lab experiences with concrete. There is a sharp difference in the COEs of steel and concretes so there WILL be significant stresses with thermal cycling. Fortunately steel is malleable so it simply smooshes and stretches to match the refractory. Unlike steel, inside or outside corners really aren't significant stress risers but there are many advantages to putting rounded corners in the molds. The real stress risers for concretes are straight edges and 90* angles in the rebar. To ameliorate this I welded a thin strip of 3/8" expanded metal to the long edges of the tube. And yes, I simple sawed one side off rather than torching an opening in a side. When I mounted the inlet straight down on the outlets 2x4 tests showed a need for a baffle/ deflector and I had some of the side I sawed off left over after making the end caps for the plenum so I welded one in half way across the plenum so it only deflected the flow rather than restricting it. When I mounted the inlet on the side I discovered there's no need for a deflector. Jay, you can make a multiple outlet burner any shape that suits your needs, the worst you might need to do is adjust the plenum to deliver reasonably even pressure to all the outlets. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
Jay Hertel Posted July 10, 2018 Author Share Posted July 10, 2018 I was thinking of maybe just a football shaped one--just for grins and seeing what happens Quote Link to comment Share on other sites More sharing options...
swedefiddle Posted July 10, 2018 Share Posted July 10, 2018 Jay, You get it fired up and throw it, I'll catch it on the downward spiral. Unless I drop it and then the test will beeeee......... Neil Quote Link to comment Share on other sites More sharing options...
Jay Hertel Posted July 10, 2018 Author Share Posted July 10, 2018 Deal Quote Link to comment Share on other sites More sharing options...
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