Drilling insulated firebrick

I have used common spade bits designed for wood to counterbore cast iron, I bet they would do well in fire brick.
 
jwmelvin said:
But I’m also working on a 3D printed core to burn out after casting refractory around it.
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In the past ive used cheap crayons and candles sized as needed so that I could melt them out at a later point in the project like you are talking about with the 3d printed jig. Anyway a piece of styrofoam, a big box of crayons and a few pieces of wood and you have yourself very quick and easy and effective mold jig to cast the ribbon burner.
 
Latinrascalrg1 said:
In the past ive used cheap crayons and candles sized as needed so that I could melt them out at a later point in the project like you are talking about with the 3d printed jig. Anyway a piece of styrofoam, a big box of crayons and a few pieces of wood and you have yourself very quick and easy and effective mold jig to cast the ribbon burner.
Click to expand...
Yea, it seems like there are a variety of possible ways to do it. Here is a picture of the couple test holes I drilled in the firebrick:
IFB drilling #1.jpg
They were full depth of that bit, which I think would work but I'd have to resaw the firebrick down from 2.5" to maybe 1.5". Possible, but that's what led me to design this core for a molded nozzle (138 nozzles, 4 mm dia., 8"x2.5" opening):
3d printed core for ribbon nozzle.jpg

I'm excited to get my castable refractory and see if I can make a nozzle.
 
That 3D print is awesome! That should work great! What refractory will you use?
Robert
 
rwm said:
That 3D print is awesome! That should work great! What refractory will you use?
Robert
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Thanks, I’m looking forward to it. I ordered mystery refractory #2 from Wayne Coe Forge. I also have Kast-O-Lite 30.
 
I like Kastolite but its kind of brittle and flaky for this application. Can't wait to see how it turns out.
Robert
 
Do you plan on casting directly onto the metal part of the burner or do you have a different option for connecting the 2 pieces together?
 
Keep in mind that metal and ceramic have differing thermal expansion. You need some way to hold the ceramic that can account for this. If they are rigidly attached the metal will stretch the ceramic and crack it. Of course some cracking may be inevitable.
Robert
 
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