Heat treat oven improvements.

Blankblank said:
https://imgur.com/a/GMastvi

It's just stuffed full of kaowool back there so you cant see a lot, but you can see the 4 terminal blocks, that connect to the 2 coils. The thermocouple is in the middle (I had to take off the base to the the aluminum flashing out to show inside.
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Twisted wire is short and is inside insulating bricks so heat can t go away .If you can find ceramic terminal blocks with stainless *hardware* probably you solve problem . If you ever change HT element use longer twisted ends and use ceramic beads for protection .That will give time to cool little wire before reach terminal bloks .
 
Natlek said:
Twisted wire is short and is inside insulating bricks so heat can t go away .If you can find ceramic terminal blocks with stainless *hardware* probably you solve problem . If you ever change HT element use longer twisted ends and use ceramic beads for protection .That will give time to cool little wire before reach terminal bloks .
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I was sure to leave the twisted ends long enough to not have the actual coil start before it enters the chamber. They may still not be long enough though I suppose.

I didnt find terminal blocks with stainless hardware, the new ones just got here, and they look similar to the laminated hardware on the old one, though maybe slightly better build quality.

I'll be starting to rebuild back there today, and I'll decide if I'm going to have to wrap a new set of elements after I make the decision on where I'm going to place the terminal blocks.
 
Natlek said:
If you know of one which would be suitable for a smaller oven , I have no problem paying the price .
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I mean. My first thoughts go to some kind of titanium alloy. You would likely need it machines and built to purpose. Idk how fast you want the air circulating for your purposes, but you may be able to work around any kind of problems with bearings if the blade isn't spinning super fast?

I really have no idea about this though. Which is why I was asking.
 
Blankblank said:
I mean. My first thoughts go to some kind of titanium alloy. You would likely need it machines and built to purpose. Idk how fast you want the air circulating for your purposes, but you may be able to work around any kind of problems with bearings if the blade isn't spinning super fast?

I really have no idea about this though. Which is why I was asking.
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Most titanium alloy can work on about 600 Celsius degrees which mean it is too low for this .No nee to be machined , fan fins can be straight like this one I used in my tempering oven from kitchen oven.... the bearings are no problem, they will be far/outside from the high temperature and other fan can cool them , same as on fan i used in tempering oven

Building tempering Oven

Last time I used kitchen oven I make mess , huge mess :D I put in oven to temper three relative long Parang from 15N20 steel . I set temp. on 250 celsius ........BUT I forgot to clean blade from quenching in oil .You can imagine what happened....smoke and smell as on the battlefield :D If I...
www.bladeforums.com www.bladeforums.com
 
Natlek said:
Most titanium alloy can work on about 600 Celsius degrees which mean it is too low for this .No nee to be machined , fan fins can be straight like this one I used in my tempering oven from kitchen oven.... the bearings are no problem, they will be far/outside from the high temperature and other fan can cool them , same as on fan i used in tempering oven

Building tempering Oven

Last time I used kitchen oven I make mess , huge mess :D I put in oven to temper three relative long Parang from 15N20 steel . I set temp. on 250 celsius ........BUT I forgot to clean blade from quenching in oil .You can imagine what happened....smoke and smell as on the battlefield :D If I...
www.bladeforums.com www.bladeforums.com
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Well. Then my next thought, is make all the components that will be exposed to high heat, out of ceramic.
 
Natlek said:
I thought of ceramic , but i don t know how to do that and where to get the material for it ?
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Yeah. It would need to be made specifically for it, in thinking just have all the blades be one piece, that come together at a circular shape in the middle so a bearing of some kind can fit in the middle. Then some sort of housing, could be made. You obviously know more about actual design this thing would need to have, to be able to work. But if you can get specs for the sizes of the parts. I'm thinking there is someone that could make them.
 
Blankblank said:
Yeah. It would need to be made specifically for it, in thinking just have all the blades be one piece, that come together at a circular shape in the middle so a bearing of some kind can fit in the middle. Then some sort of housing, could be made. You obviously know more about actual design this thing would need to have, to be able to work. But if you can get specs for the sizes of the parts. I'm thinking there is someone that could make them.
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We need something like this .Just Fan with shaft , rest is easy .Bearings , houses for bearings need to be outside of oven wall
iMnwHAI.png
 
Natlek said:
We need something like this .Just Fan with shaft , rest is easy .Bearings , houses for bearings need to be outside of oven wall
iMnwHAI.png
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I think that is pretty simple then. Theoretically. If someone knows the right people I bet this could be made at a decent cost.

Who knows, something like that might already exist for another purpose, and could be repurposed, or slightly modified to work.
 
I think your biggest challenge will be finding a material that will take 2k+ degrees without losing it's shape.
 
A.McPherson said:
I think your biggest challenge will be finding a material that will take 2k+ degrees without losing it's shape.
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Fan exist , I found them with maximum resistance 1250 degrees .They are used in industrial vacuum furnace , problem is that smaller I found have 380mm Dia :mad:
 
Natlek said:
Fan exist , I found them with maximum resistance 1250 degrees .They are used in industrial vacuum furnace , problem is that smaller I found have 380mm Dia :mad:
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Couldn't you find a way to score the ceramic, then snap it? Much like someone would cut, and snap glass?
 
Ok. I've replaced the bottom with firebrick. And moved the location of the terminal blocks. It's in a more dangerous location now. So if anyone has any ideas on how to make an enclosure I would love to hear them.

Also I had to make new elements to reach the new location. So I made them about 14 ohms each (7 ohms in parallel). Which should be giving me around 15 amps (depending on what I'm getting from the wall at the time). Its heating pretty well now. I turned it on 10 minutes ago, and it's at 763 farenheit now.

https://imgur.com/a/rFC6r5E


Edit: also I repurposed the old terminal blocks (at least 2) to keep the elements from touching the aluminum flashing. I have it completely stuffed with kaowool between the back of the kiln and the flashing.

That's all I can think of right now.
 
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So things are going well with the current iteration of the oven. I'm about to improve the next weakest link. Which is the fuseholder. It is supposed to be rated for way above what I'm running it through, and its heating up way too much. Which means there are problems with resistance that shouldn't be happening. Its causing problems, and I've decided I need to go ahead and replace it.

If I'm going to do that I'm thinking I should probably just go ahead and use a breaker anyway. Now I have a couple choices on where I can go from here. Do you guys think I should use a gfci type breaker? It might make sense as far as dangerous electrocutions. Or rather just get whatever 20 amp breaker I find. (I'm thinking push button is the way to go).


Tl;dr my fuseholder sucks. I'm going to buy some kind of breaker for the kiln. What kind should I get?
 
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