Vacuum kiln

Discussion in 'Processing' started by Mike1950, Mar 10, 2020.

  1. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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  2. TXMoon

    TXMoon Member Full Member

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    I've wondered about this. Reading it now.
     
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  3. TXMoon

    TXMoon Member Full Member

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    Interesting read though a lot of it was a bit too technical and seemed to me to be geared more toward construction lumber. But from what I understand of the article they are recommending using vacuum with a heat source. How about us hobbyist? I have a X x Y x 3" blank that will fit in my vacuum pot. Can I use that along or do I need to set it on a low temp hot plate too? I was thinking of sitting the wood on an inch or so of desiccant type cat little and just putting it under a vacuum until I see moisture bubble up from the wood.

    Your thoughts?
     
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  4. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    My friend dries coco and honduran in his. says there is a learning curve but results are much less degrade.. with very quick turnaround...
     
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  5. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    I have wondered the same. but I think there would have to be a water trap to keep water out of pump.
    I doubt you would need a heat source- they tell me it is warm in Texas....
     
  6. TXMoon

    TXMoon Member Full Member

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    I was hoping the desiccant would help keep water out of the pump but some sort of trap couldn't hurt. For sure this summer I wouldn't need one but it's still only in the 50s to 70s here.
     
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  7. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    I am always amazed at how much water is in wood. I put a batch of burl in kiln about 5 weeks ago. started out at a drip a second= 5 gallons a day- just got below 1 drip every 5 seconds - which is 3 quarts a day- lot of water out of 22% burl
     
  8. TXMoon

    TXMoon Member Full Member

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    Yikes! Then a trap with a drain is going to be needed. Hold my beer....
     
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  9. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    kiln is a 5'x6'x12' box
     
  10. TXMoon

    TXMoon Member Full Member

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    Mine is a 5 gallon SS vacuum pot. A bowl blank should fit in there.
     
  11. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    I think dry BLM weighs 3lb a bd ft wet 4. so 12x12 x5 would lose 5lbs. I think water weighs about 8 lbs a gallon. little over 2 quarts- seems like an awful lot of water but i think numbers are right
     
  12. TXMoon

    TXMoon Member Full Member

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    Sounds right. Is that taking it down to 0% moisture? It'll be an interesting experiment if nothing else.
     
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  13. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    my guess is those rough numbers 4lbs and 3 are green vs 6%
     
  14. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    the industry does not req. 0%
     
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  15. trc65

    trc65 Member Full Member

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    Some random thoughts from someone who knows only what he has read in the last couple of days, i.e. next to nothing...

    You will definitely need a condenser/trap on the vacuum line.

    The "evaporation" of water from the wood has a net cooling effect on the wood and without some sort of heating element, results in the need to run "cycles" so that the wood can warm up between vacuum cycles and be able to continue to release moisture.

    A lot of people in different discussion forums have said it just isn't worth the trouble to try it for the average hobbyist. Unless, you are dealing with some expensive, hard to dry woods that degrade with conventional drying methods.

    Most discussions have ended with the conclusion that if you just want to more quickly dry turning blanks, make a dishwasher or refrig kiln...
     
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  16. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    A de-humid kiln is as sophisticated as I am going to get. The one I saw at Bolhke looked like a mini sub. It also looked extremely spendy
     
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  17. pvwoodcrafts

    pvwoodcrafts Member Full Member

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    I like my dehumidify kiln. Been using it for close 30 years. I always air dry before kiln for my own personal use . Virtually no degrade or loss in the kiln
     
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  18. Karl_TN

    Karl_TN Member Full Member

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    @Mike1950, @pvwoodcrafts,

    Any pics of your dehumidifying kiln setup? Got any tricks for drying really thick turning blanks (i.e. 3 to 8 inches thick)?
     
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  19. Eric Rorabaugh

    Eric Rorabaugh Member Full Member

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    Tricks, yea....time!

    :sofa:
     
  20. Mike1950

    Mike1950 Founding Member Founding Member Full Member Thread Starter

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    On road. Will picture when I get home. Not much to see. Drying big blocks, make smaller or be patient
     
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