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Author Topic: Dose size matter?  (Read 429 times)

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Offline JRHD

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Dose size matter?
« on: January 17, 2019, 12:25:03 PM »
Would you use the same moisture content schedule to dry random width & length 8/4 walnut as you would dimension stock?
8" x 16" x 2 3/8". I get very little h/c in a 30,000' charge of 8/4 but will see 5 to 6% h/c in a charge of 35,000 pieces of the dimension. The dimension pieces are defect free, waxed on both ends, and have sticks every 5".

Offline GeneWengert-WoodDoc

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Re: Dose size matter?
« Reply #1 on: January 18, 2019, 03:49:45 PM »
Short dimension pieces have more surface to volume, so they dry faster, which means more risk.  Also, Dimension can have a defect an inch or two from the end, but this defect was cut off.  Overall, this means cross grain at the end of a dimension piece, which again is more defect prone.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline JRHD

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Re: Dose size matter?
« Reply #2 on: January 18, 2019, 04:26:19 PM »
Thanks for your input. I forgot to mention that in both cases I am talking about walnut.

Offline YellowHammer

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Re: Dose size matter?
« Reply #3 on: January 18, 2019, 08:25:20 PM »
As said, the higher the relative surface area, the more forgiving the kiln schedule must be, especially if starting higher than the fiber saturation point.  I dont go as conservative as a 4/4 schedule, but certainly dial it back a little whenever Im drying small chunks, especially high value walnut.  I will also run cooler temperatures, and try to get to the characteristic walnut stall point, then I increase the temps, and then finally drop the wet bulb.  

I assume you are using a steam kiln?


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Offline JRHD

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Re: Dose size matter?
« Reply #4 on: January 22, 2019, 04:58:24 PM »
Yes steam kilns. These charges are pretty green. Usually start in the 70 to 80% moisture range. I start with a 4 degree depression and stay a step behind where 8/4 would be for any given moisture content. These are mostly all plain sawn with little to no figure.  

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