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Wood oven?

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Forum topic by pontic posted 12-05-2017 02:08 PM 256 views 0 times favorited 10 replies Add to Favorites Watch
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pontic

505 posts in 448 days


12-05-2017 02:08 PM

I was thinking about making an oven out of galvanized sheet metal and hot water insulation with an exterior wood frame.
Using one or two heavy duty heat guns to blow hot air into it, connect the power circuit to an internal thermostat that will keep the inside at 212F. When it reaches this temp. let the wood “bake” for 24-36hrs. then take a moisture reading what do you think? Good or bad idea. Am I just gonna make a big fire?

-- Illigitimii non carburundum sum


10 replies so far

View Fresch's profile

Fresch

93 posts in 1760 days


#1 posted 12-05-2017 04:06 PM

Hot water insulation? 212f boiling, how do you make and control? Heat guns, how about a boiler?
Need more info. sounds like money; could be done.

View Wildwood's profile

Wildwood

2188 posts in 1974 days


#2 posted 12-05-2017 04:30 PM

JMHO, while warth does help wood dry have to watch the heat or you’ll just dry wood too fast causing drying defects. Dry wood nothing more than a water removal process.

Water will evaporate from wood with just simple air circulation and protection from the elements (direct rain, wind, and sunlight and stored of the ground).

Even in a solar kiln have to watch the heat! The ability and knowledge applying heat is widley known by kiln operators due to monitoring both temps & relative humidity. For green hard wood may start at 120 degrees with 80% humidity. By the time wood reaches 15% MC, temperatures may increase to 180 degrees F. The numbers listed are just for sake of discussion and might not apply to anything about acual drying wood.

Your idea has some flaws but might work with simple light bulbs for heat and fan for air circulation to hasten drying times. Just don’t use lamps or lights with too high heat.

-- Bill

View Loren's profile

Loren

9637 posts in 3487 days


#3 posted 12-05-2017 05:18 PM

I don’t think you need that much heat to
dry wood parts for making chair rungs or
whatever. I don’t think you need a heat
gun either. A hot plate or light bulbs may
be adequate.

View Tim's profile

Tim

3683 posts in 1801 days


#4 posted 12-05-2017 05:58 PM

Pontic that’s too hot you’ll create a dry outer surface that will make it take longer to dry evenly.

Here’s two good resources for more information. One vintage and one more modern.
http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0003/390288/Seasoning-of-Timber.pdf
https://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr118.pdf

View tomsteve's profile

tomsteve

667 posts in 1058 days


#5 posted 12-05-2017 07:24 PM

youll destroy a lot of lumber attempting to dry it that way.
kild drying lumber is a science of its own and not as simple as that.

look into solar kilns,too.

View bondogaposis's profile

bondogaposis

4482 posts in 2190 days


#6 posted 12-05-2017 07:27 PM

Wood should dry slowly, accelerating the process is just going to waste a lot of wood.

-- Bondo Gaposis

View Rick_M's profile

Rick_M

10641 posts in 2219 days


#7 posted 12-05-2017 07:35 PM

Another point, relating to Tim’s post, is case hardened lumber is dangerous to rip on the tablesaw and very prone to kickback. And probably a devil to cut by hand because it’ll cinch up tight on the blade. After it’s cut you’ll have bow staves instead of straight pieces. But you never know until you try. Hundreds of times I’ve been told something wouldn’t work and yet did it successfully so give it a try.

-- http://thewoodknack.blogspot.com/

View Loren's profile

Loren

9637 posts in 3487 days


#8 posted 12-05-2017 08:07 PM

Sometimes “shop ovens” are used in making
furniture with round tenons, like windsor
chairs. The rungs are shrunk in the oven
prior to cutting the tenons to fit. Then the
tenons swell a little as they gain moisture
again. It makes supposedly really durable
joints. I haven’t tried to make that style of
chair joinery yet but it’s on my bucket list.

View DocSavage45's profile

DocSavage45

8379 posts in 2682 days


#9 posted 12-05-2017 08:30 PM

My two cents?

Good information here. How often will you use the oven? Will it be cost effective? A lot of projects ? Then I’d invest time and money. Commercial drying uses both heat and moisture controlled over time. Solar kilns need regulation to prevent problems.

Not a bad beginning idea.

-- Cau Haus Designs, Thomas J. Tieffenbacher

View sawdustdad's profile

sawdustdad

335 posts in 724 days


#10 posted 12-05-2017 09:18 PM

The easiest way to dry lumber yourself is to build a box, sticker the lumber inside and put a dehumidifier and a small circulating fan in it. Depending on starting MC, you could have usable lumber in a month or two. (Rig up a continuous drain for the dehumidifier of course.)

-- Murphy's Carpentry Corollary #3: Half of all boards cut to a specific length will be too short.

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