LumberJocks

Kiln for the Green Wood

  • Advertise with us
Project by skone posted 892 days ago 2383 views 4 times favorited 15 comments Add to Favorites Watch

Is this a kiln? A dehumidifier? Will this dry rough turned green bowls? Remains to be seen but…

This build is an amalgam of numerous comments, plans, articles, et cetera. Thank you, whoever you are. I read what I could, wherever I came across it and then just plain old went with it. Budget-style.

The cabinet is wood but it’s not my handy work. $15 off of craiglist. Yeah, I know – cut me a break. Mostly, I didn’t want to build a dedicated structure from scratch with very specific holes carved into it and then have this whole “experiment” not work.

The cabinet is 38” tall and 19” wide and mostly solid hardwood. It came from an elementary school. It has a false bottom (I guess you’d call it) which is great as a place to stash the wiring and whatnot without taking away from the useable cabinet space.

Heat rises so I put a 5 or 6” diameter shop light (with a 60 watt bulb) down in the bottom. Surface mounted by using the aforementioned false bottom. I lopped the lamps plug off and wired it through a switch. The other switch controls the fans. These are 12v DC computer fans. I got 5 of them today for a whopping $2. They’re not for intake of exhaust—- just circulation. I jigsawed two 4” holes in the shelf and mounted two fans in opposing airflow directions. I perforated the shelf with a lot of 3/8” holes as well.

I wired my 2 fans to a DC converter that came out of my stash of old electronic junk. It was probably from a phone or a USB hub or something. The fans are 12V and the converter output is 7.5. It was the best I could do and no regrets – the fan speed seems fine. Just a light breeze.

I still need to put a vent up top—- I’ll do it tomorrow. Gotta give the moisture an exit. Also, I plan on keeping an eye out for shelves. I’m thinking old oven racks or something like a metal grill. Figure if I find them I can always trim them to size with my grinder.

Temperature was a steady 78 degrees up top and 80 down next to the bulb. Good air circulation…..

Any initial input or observations? Appreciated.

If anyone’s interested, I’ll give an update on if and how this works.

-- "Take extra care not to lose what you feel" (Winwood/Capaldi/Wood)





15 comments so far

View Hoakie's profile

Hoakie

306 posts in 2634 days


#1 posted 892 days ago

I am not expert but it seems everything i’ve seen in regard to drying turned blanks is to try and slow down the drying process. However nobody else seems to get consistent results either. I’ll be interested to see if this works because if it does then you have a real nice inexpensive tool at your disposal. Nice work

-- John H. [To invent, you need a good imagination and a pile of junk. ~Edison]

View Rick M.'s profile

Rick M.

3777 posts in 978 days


#2 posted 892 days ago

In printing we make drying cabinets that are similar but use a small dehumidifier vented to the outside, much quicker than a direct heat source.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View Woodstock's profile

Woodstock

227 posts in 1886 days


#3 posted 892 days ago

A good source of info on “DIY” kilns is Daren. Interesting non standard way to dry small runs of lumber including turning blanks.

http://www.woodworkingtalk.com/f23/small-wood-drying-kiln-plans-dry-your-own-lumber-3103/

(Note the 25% off if you join Woodworkingtalk. Free to register. And no I’m not trying to get anyone to jump ship from LJ’s! But $15 is better than $20.)

As a customer, I just got the info from Daren last week and I am in the process of putting one together. Daren was very fast on the turn around from placing the order. (PayPal) Only a few hours to get since it is a .pdf file right to my in-box. So no stalking the UPS delivery guy this time around.

-Dave

-- I'm not old. Just "well seasoned".

View Tallahassee's profile

Tallahassee

46 posts in 965 days


#4 posted 892 days ago

I’ve been thinking about building one for lumber shorts and pen blanks, so I’m definitely interested in how this works out. Cheap is good. Quick drying without defects is good, too.

-- Dana, Tallahassee, FL

View DocSavage45's profile

DocSavage45

4738 posts in 1441 days


#5 posted 891 days ago

Looks practical. Triggers a bunch of “what ifS” for me. How do you monitor/regulate temperature? Thinking about the old “easybake ovens” for kids. Could bake real cakes w/60 watt bulb.

Have a nieghbor with his own sawmill. He built aroom using a dehumidifier as was mentioned by wormil.

Maybe lining the box with galvanized sheetmetal if it doesn’t currently do the trick?

Good luck! :)

-- Cau Haus Designs, Thomas J. Tieffenbacher

View skone's profile

skone

144 posts in 1404 days


#6 posted 891 days ago

i’ve added some venting to let off the humidity. and insulated as well.

hoakie – the slow approach is certainly a method. wrap in paper, etc.

thomas, as for regulating temp it’s a matter of light on or off, what wattage bulb and watch the thermometer and/or moisture meter. (in theory)

just an experiment.

as for daren, i’ve heard about his plans.

-- "Take extra care not to lose what you feel" (Winwood/Capaldi/Wood)

View crank49's profile

crank49

3337 posts in 1569 days


#7 posted 891 days ago

Heat, by itself does not dry anything.

You might wind up with a sealed box with 150 degrees and almost 100% humidity inside.

On the other hand, I’ve seen a local sawmill with large kilns actually wrap large stacks of lumber with black plastic and pipe steam into the bundle.

I have heard of drying turned bowls in a microwave. Haven’t tried it myself.

In any case, I think you will need to alllow for some small controlled amount of ventilation.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View StumpyNubs's profile

StumpyNubs

6116 posts in 1399 days


#8 posted 891 days ago

Great idea, great job! Thanks for posting!

-Jim; aka “Stumpy Nubs”

Blue Collar Woodworking? That's the best show since Hawaii 5-0! ” -The Podunk Journal

-- It's the best woodworking show since the invention of wood... New episodes at: http://www.stumpynubs.com

View skone's profile

skone

144 posts in 1404 days


#9 posted 891 days ago

”Heat by itself does not dry anything.”
That is correct. Heat has to introduce itself to moisture and perform the magical dance we call evaporation.

”You might wind up with a sealed box with 150 degrees and almost 100% humidity inside.”
Remains to be seen but I’ll stick my neck out and say that I will not wind up with such a box.

This cabinet has a heat source and two internal fans. This equals constant, moisture-wicking, even temperature.

This cabinet has vents up top to allow moisture captured by hot air a point of exit.

This cabinet is covered in insulation to minimize influence by outside temperatures.

This will dry the wood quickly without a doubt. I think the question here is the same old question everyone always poses: Will the wood crack, check, split, et cetera. Since insulating, it has maintained a steady 90 degrees. That seems kind of high but I’m gonna go with it for the rough turned blank that is in there right now.

-- "Take extra care not to lose what you feel" (Winwood/Capaldi/Wood)

View Rick M.'s profile

Rick M.

3777 posts in 978 days


#10 posted 890 days ago

I’m really curious how this turns out. Once I get a bandsaw built, I want to resaw some firewood and don’t want to wait years to use it.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View skone's profile

skone

144 posts in 1404 days


#11 posted 636 days ago

Revisiting my LJ pages for the first time in a long while. Thought I’d throw a quick comment up on this particular build. And that is that this worked out great for wood blanks. I’ve also used it for drying fruit and hops with great success.

-- "Take extra care not to lose what you feel" (Winwood/Capaldi/Wood)

View DocSavage45's profile

DocSavage45

4738 posts in 1441 days


#12 posted 635 days ago

no splitting on ends?

-- Cau Haus Designs, Thomas J. Tieffenbacher

View skone's profile

skone

144 posts in 1404 days


#13 posted 635 days ago

Hey Doc. Nope – no split ends. Used a General brand moisture meter – with the two metal spikes you stick into the wood – and I got the moisture down in good time with no splits, checks, etc. Granted, I’ve only done it a few times. Spring and Summer I’m in the garden and brewing. Cold weather is hitting here in Vermont – I’m back in the shop today, first time in a while.

Maybe I got lucky, but I’ll be darned if it doesn’t work.

-- "Take extra care not to lose what you feel" (Winwood/Capaldi/Wood)

View Rick M.'s profile

Rick M.

3777 posts in 978 days


#14 posted 635 days ago

Wonder how it would work with a dehumidifier, pretty good I’d expect although you’d have to keep emptying it.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View DocSavage45's profile

DocSavage45

4738 posts in 1441 days


#15 posted 634 days ago

Good! tie down the tools! “Sandy” is apparently over most of the seaboard states.

-- Cau Haus Designs, Thomas J. Tieffenbacher

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase