seagiant Posted June 26, 2023 Share Posted June 26, 2023 Hi, Thought I would show my HT Oven made from a Toaster Oven... Opened the casing up and direct wired the Elements and added some K-Wool around the casing on 3 sides. Put in the Thermocouple and a firebrick to even the heat and she works pretty nice. Keeps a pretty even heat with no more than a 10 degree swing from what I can see. I also use this PID for my Cast Bullet Furnace and my Gun Kote Oven! Quote Link to comment Share on other sites More sharing options...
Candidquality Posted July 11, 2023 Share Posted July 11, 2023 Looks a treat. Might be worth building my own. Have a old knife I made out of A2, that I guess I ought to heat treat after 20 years... Quote Link to comment Share on other sites More sharing options...
JHCC Posted July 11, 2023 Share Posted July 11, 2023 I did this a few years back with a secondhand toaster oven, and it was a total failure. I think the water from the rigidizer may have shorted out the electric elements. Quote Link to comment Share on other sites More sharing options...
seagiant Posted August 6, 2023 Author Share Posted August 6, 2023 Hi, Well, thanks for the warning, even though, I do not use rigidizer. The added K-Wool and the PID does make a better product and easy to use. Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted August 6, 2023 Share Posted August 6, 2023 its not safe to use Koawool with out sealing it Quote Link to comment Share on other sites More sharing options...
Buzzkill Posted August 7, 2023 Share Posted August 7, 2023 Hmm. A heat treating oven would not be reaching very high temperatures for kaowool. If the blanket is not exposed it would be far different than direct flame impingement in a gas forge. If I understood correctly, he took the cover off, wrapped the inner compartment with wool (on 3 sides) then reinstalled the outer cover. To err on the side of safety we would certainly recommend a rigidizer/sealant, but this seems like a low risk situation to me. There would be more potential for airborne fibers during the installation than during use it would seem. Still, better safe than sorry. Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted August 7, 2023 Share Posted August 7, 2023 his lungs, he will find out, at least he has 2 of them Quote Link to comment Share on other sites More sharing options...
Frosty Posted August 7, 2023 Share Posted August 7, 2023 Ceramic blanket refractories don't need to reach vitrifying temperatures to be breathing hazards. Any reckless use should be discouraged when possible. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
Buzzkill Posted August 7, 2023 Share Posted August 7, 2023 Agreed. I'm just trying to figure out if it actually is reckless. Generally speaking, if the blanket is contained between 2 metal sheets and not directly exposed to the working area would you consider that appropriately sealed off? I would cautiously answer that it is. I'm not trying to pick a fight with anyone or even really pick a side. I do think we should err on the side of caution, but I also think we should be realistic or at least avoid being alarmist if it is not truly appropriate. Quote Link to comment Share on other sites More sharing options...
Frosty Posted August 7, 2023 Share Posted August 7, 2023 True it would be okay I suppose. I've only ever seen the inside of a couple toaster ovens and there's hardly any gap between the inner liner and shell. I don't know what compressing ceramic fiber enough to fit would do to it's insulating properties. Probably see better insulation by wrapping the outside in R20 fiberglass insulation just not close enough to burn the works. I temper things small enough in a yard sale toaster oven and moderate the temps with a couple brick tiles on the rack and cover it with a steel box I salvaged somewhere. Of course if a person used a non-bio-persistent refractory wool it wouldn't matter so much. These refractory fibers can be dissolved in the body and safely expelled through normal means. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
Buzzkill Posted August 7, 2023 Share Posted August 7, 2023 My tempering oven isn't pretty, but I took the guts out of an old toaster oven and I also use a PID controller. The only reason I took it apart is the interior dimensions were too small for some of my larger blades. However, since I know I'll never have the oven over 600 degrees F, I chose to use rockwool insulation that is rated for up to 1200 F, and it's sandwiched between two layers of sheet metal. Originally I thought I'd use the heat treat oven I built a few years ago to attain quench temperatures and then temper afterwards, but it takes quite a few hours to cool back down to tempering temperatures after being up around 1500 F. I can't run them both on the same circuit at the same time without tripping a breaker though. Quote Link to comment Share on other sites More sharing options...
Frosty Posted August 7, 2023 Share Posted August 7, 2023 And people ask me why I don't make knives. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
seagiant Posted August 10, 2023 Author Share Posted August 10, 2023 On 8/7/2023 at 11:05 AM, Steve Sells said: his lungs, he will find out, at least he has 2 of them Hi, Let's see, I'm going to lose my lungs from a piece of K-Wool sandwiched and sealed between two pieces of sheet metal??? Got anymore of those Crystal Balls??? Thanks, for the "Concern"! Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted August 10, 2023 Share Posted August 10, 2023 You are not the only person reading this thread. Other people need to be aware of the dangers of unsealed koawool. When did you ever say sealed? I said it needs to be sealed, if it is there is no worry. But dont worry about me wont bother you again Quote Link to comment Share on other sites More sharing options...
seagiant Posted August 10, 2023 Author Share Posted August 10, 2023 Hi, Thanks! Quote Link to comment Share on other sites More sharing options...
Irondragon Forge ClayWorks Posted August 10, 2023 Share Posted August 10, 2023 Have you read this yet? If not you really need to and anyone else reading this thread. https://www.iforgeiron.com/topic/53239-ceramic-wool-insulation-safety-alert/ I can't control the wind, all I can do is adjust my sails. Quote Link to comment Share on other sites More sharing options...
Frosty Posted August 11, 2023 Share Posted August 11, 2023 He's probably read it Randy and is using the information and our well known reaction to unsafe behavior to troll us. It's a pattern he's starting to show. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
gewoon ik Posted August 11, 2023 Share Posted August 11, 2023 You could go cheaper and use rockwool instead as well, the toaster oven and use will not make it hot enough to break down the rockwool. Quote Link to comment Share on other sites More sharing options...
seagiant Posted August 11, 2023 Author Share Posted August 11, 2023 10 hours ago, Frosty said: He's probably read it Randy and is using the information and our well known reaction to unsafe behavior to troll us. It's a pattern he's starting to show. Frosty The Lucky. Hi, Do the Mods allow you to call people Trolls on this Forum? I have never called for any unsafe practices on this Forum that I know of? Mod note, upon review there is no one being called a troll, a comment was only made about trolling actions Quote Link to comment Share on other sites More sharing options...
seagiant Posted August 12, 2023 Author Share Posted August 12, 2023 Hi, Well, I guess they do! LOL! Quote Link to comment Share on other sites More sharing options...
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