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Thread: Really small kiln?

  1. #1

    Really small kiln?

    I build musical instruments so my work pieces are small and I consume relatively small amounts of board feet. That said I like to salvage dead trees and have a ready supply of dead cherry trees since they tend to live only until they are 10-14 in diameter here. I have used some blown down trees rough sawn by eye with a chainsaw and then milled at home on a 14" bandsaw.

    I have been surprised that the planks seem to dry pretty fast just sitting in the shop, but as I do more of this I think maybe a small kiln might make sense. My work never requires finished pieces more than 3' long and most are less (most of it is ultimately sawn into thicknesses of 0.090-0.125"). I could see a kiln as small as one accommodating only a couple dozen board feet and a maximum length of only 3-6' working for me.

    Has anyone used or seen a kiln that tiny? Is there any reason it is an especially bad idea?

    Solar sounds appealing, but I am not sure if I can find an acceptable spot that gets more than a few hours of sun per day. I am in Tallahassee so the sun is pretty hot, but I just don't have a place with long hours of sun.

    I wonder if something quite small with a small muffin fan and a light bulb or two for heat would be at all practical.

    Thoughts on any of that? I have only had a minimum of experience with this and probably have done everything wrong so far, but I have been happy with being able to produce small quantities nice useable stock despite my crude approach.

  2. #2
    Join Date
    Mar 2015
    Location
    cleveland,tn.
    Posts
    172
    how about a small metal shed with a couple of gable vents and a fan. I believe that it would be best with a concrete floor to control pests and moisture. I lived in Clearwater ,fla. and I remember how hot the old shed got when closed up.

  3. #3
    Use a 120v humidistat to control a light bulb in an insulated box with a fan in it.

  4. #4
    If you put in the time to read about kilns, a concrete floor does not work. You want a raised floor, insulated. There is a lot posted on forestryforum about solar and other kilns. One guy uses a room dehumidifier to remove the moisture from the kiln, so it does not have to be vented.

  5. #5
    Join Date
    Feb 2003
    Location
    Hayes, Virginia
    Posts
    11,892
    Find an old horizontal freezer for the box. If you have a friend with HVAC skills you can convert a small dehumidifier that you can install in the box and then control the drying cycle.

  6. #6
    Join Date
    Dec 2010
    Location
    WNY
    Posts
    4,085
    I built a dehumification kiln as described in FWW Nov/Dec. 1991. My kiln holds about 275 BF, but can easily be scaled to nearly any size, including really small.



    It has a semi automatic control system; requiring attention only once a day, and will idle w/o damage to the wood if I go on vacation, etc. Three 100W bulbs provide the initial heat up to its 110 F operating temperature and the dehumidifier takes care of removing the moisture and provides heat as well. You could actually build an even simpler control system as shown in this diagram:



    Having said and showed all this, I've found in practice that it's far better to air dry my lumber to less than fiber saturation point (28% MC) before putting it in the kiln. That only takes 4 to 6 months were I live for 4/4 lumber. Then I put it in the kiln and dry it to 6 - 8% MC in less than 2 weeks.

    John

  7. #7
    Join Date
    Nov 2013
    Location
    Lake Hiawatha, NJ
    Posts
    162
    Depending on how small you want to go you maybe able to do a vacuum kiln, creating a vacuum will lower the boiling point of water and using a heat lamp or some sort of heating element should net you what you want,


    back to lurking

  8. #8
    Join Date
    Feb 2008
    Location
    E TN, near Knoxville
    Posts
    2,606
    Woodturners often use an old fridge or freezer cabinet to make a small kiln. Google has lots of info. Here is a write-up about one pro woodturner Cindy Drozda made:

    https://www.google.com/url?sa=t&rct=...zZA7Aw&cad=rja

    JKJ

  9. #9
    A microwave is pretty small.
    Seriously, the last 3 pieces I made I dried in a microwave.
    The problem with that is no universal method. It' all by guess and by golly. But you can dry wood fast.

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