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Old Nov 06, 2009, 09:46 PM
wyowindworks is offline
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My Hot Box


Here are some photos of my hotbox. There was a discussion in another thread about hot boxes so I thought I'd post photos and descriptions of mine.

WARNING: This could burn down your shop. Use this system at your own risk.

I use a small 120 volt base board heating unit to heat the box. Make sure that you get one that has a circuit that trips the unit off if it overheats (and turn back on automatically when the unit cools back down). I use a hot water heater thermostat to control the temps. The thermostat doesn't require a relay, so it can be simply wired into the main circuit that goes to the heating unit. I have added a fuse into the main circuit to protect the whole thing from going wacko.

All the foam panels are glued together with Gorilla Glue. I used 3.5" sections of bamboo skewer to pin it together until the glue dried. The entire box in made from two layers of 1.5" Dow Scoreboard (25 psi foam).

See the photo descriptions for more info.
Last edited by wyowindworks; Nov 06, 2009 at 10:05 PM.
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Old Nov 06, 2009, 11:01 PM
wtxrcdog is offline
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That is a great hotbox. I need one like that so I won't get in any more trouble with my wife for using the oven!!!!

Bruce
Old Nov 07, 2009, 11:19 AM
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so that is what that blue foam is for? nice job... got any supergee pods coming out of that oven??? SL
Old Nov 07, 2009, 11:23 AM
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nice job... got any supergee pods coming out of that oven??? SL
Only if someone gets me a supergee mold.

Adam
Old Nov 07, 2009, 11:35 AM
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Only if someone gets me a supergee mold.

Adam
https://www.rcgroups.com/forums/show...3#post13526553
Old Nov 07, 2009, 01:47 PM
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wishes this caption was longe
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Nice box Adam!

Here is the temperature controller I have been using for my hotbox. I cut an extension cord in two and wired one end of the controller with the wall plug and the other with the receptacle head. That way I can move the controller between different size hotboxes. I use light bulbs wired in parallel as the heat source. Pretty simple set up.

http://www.rancoetc.com/ranco-etc111...ller-p-86.html
Old Nov 07, 2009, 03:52 PM
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Originally Posted by will_newton View Post
Nice box Adam!

Here is the temperature controller I have been using for my hotbox. I cut an extension cord in two and wired one end of the controller with the wall plug and the other with the receptacle head. That way I can move the controller between different size hotboxes. I use light bulbs wired in parallel as the heat source. Pretty simple set up.

http://www.rancoetc.com/ranco-etc111...ller-p-86.html
I saw from one of your previous post that you were using that thermostat. It looks pretty nice. The down side to a hot water heater thermostat is that the temp. can fluctuate around 12*F. I might have to upgrade to that unit.

Adam
Old Nov 07, 2009, 08:19 PM
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The Junk Man
There are inexpensive temperature controllers all over eBay. Pick one that takes the old standard K-Type sensors. You can get K-Type sensors for a couple of bucks apiece, also all over eBay.

I have an old Johnson Controls unit that I have had forever, but there are new digital temperature controllers now very cheap.

Tom
Old Nov 08, 2009, 11:15 PM
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Quote:
Originally Posted by wyowindworks View Post
I saw from one of your previous post that you were using that thermostat. It looks pretty nice. The down side to a hot water heater thermostat is that the temp. can fluctuate around 12*F. I might have to upgrade to that unit.

Adam
The air temp fluctuates 12 degrees.. The surface temp MAY fluctuate 0.25 degrees. The water heater thermostats seem to have better resolution on the high temp scale, as you approach 150-180.

As an insurance to keep her from going nuclear, I suggest a second thermostat set to a ultimate high temp shutoff. This would both save your wings and the shop. fwiw, I only have one, and it is 4 years old, and has never had a problem!

Walmart sales on fans are great! $1.50 for a 6" fan, but they only last a few months!
Old Nov 09, 2009, 01:18 AM
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Adam
can you give us some more details on the wiring for the thermostat? I've heard of using these hot water thermos' before but never actually got around to pulling one out to look at it.

thanks

Steve
Old Nov 09, 2009, 01:55 AM
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Adam
can you give us some more details on the wiring for the thermostat? I've heard of using these hot water thermos' before but never actually got around to pulling one out to look at it.

thanks

Steve
Here you go. The thermostat need to be placed somewhere in the box with it's back open to the ambient air.

Adam
Last edited by wyowindworks; Nov 09, 2009 at 03:51 AM.
Old Nov 09, 2009, 07:38 AM
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Thanks, that's very similar to how I wired up my vac switch.

The couple of photo's I looked at had terminals everywhere but I found a wiring diagram that explains how they work - much easier with some helpful info!

Steve
Old Nov 09, 2009, 10:50 AM
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Just a side note:

After working in the attic this weekend, I am putting a vacuum line and large shelf up there because it gets darn hot even in November( yeah it is Socal).

I don't think my attic gets hot enough to damage the foam but it does get to 115F( where the attic fan turns on). Heats up right on cue( about 11 Am) and I can build really big wings if I want to.

Something to think about
Scott
Old Nov 09, 2009, 09:35 PM
will_newton is offline
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wishes this caption was longe
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I've cured parts in my car on hot summer days.
Old Nov 11, 2009, 05:03 PM
JIM CALDWELL A is offline
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Half a 55 gal drum painted black on asphalt parking lot= 143f, but you have to keep an eye on it for temps. I propped one side up when it got to 140f!!!


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